大话企业级Android应用开发实战文件下载

25 Android文件下载

25.1 Android文件单线程下载

25.1.1 J2SE文件单线程下载

1．J2SE从网络获取图片

3）源码再现

package com.sharpandroid.junitTest;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import org.junit.Test;

public class InternetTest {

@Test

public void getImage() throws Exception {

// 首先我们要得到请求的路径, 路径为我们想要得到的资源

String urlpath = "http://i1.itc.cn/20100326/3b8_921a1797_

8fb1_4551_b4a3_dad3746f53fb_0.jpg";

URL url = new URL(urlpath); // 建立URL类对象,抛异常

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

//得到urlConnection对象

conn.setRequestMethod("GET"); // 声明请求方式

conn.setConnectTimeout(6 * 1000); // 设置链接超时

if(conn.getResponseCode() == 200) {

InputStream inputStream = conn.getInputStream();

// 得到服务端传回来数据，相对客户为输入流

byte[] data = readInstream(inputStream); // 得到数据

File file = new File("sohu.jpg"); // 创建保存文件

FileOutputStream outputStream = new FileOutputStream(file);

// 创建一个文件的输出流

outputStream.write(data);

// 把所得的二进制数据全部写入到我们建好的文件中

outputStream.close(); // 关闭输出流

}

2．J2SE从网络获取文本

1）源码回现

在InternetTest类中添加getHtml()方法，具体代码为：

@Test

public void getHtml() throws Exception {

// 首先我们要得到请求的路径 ,路径为我们想要得到的资源

String urlpath = "http://www.sohu.com";

URL url = new URL(urlpath); // 建立URL类对象,抛异常

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

// 得到urlConnection对象

conn.setRequestMethod("GET"); // 声明请求方式

conn.setConnectTimeout(6 * 1000); // 设置链接超时

if (conn.getResponseCode() == 200) {

InputStream inputStream = conn.getInputStream();

//得到输入流

byte[] data = readInstream(inputStream); //得到数据

System.out.println(new String(data)); //将字节转换为字符串打印

在控制台上

}

3．J2SE从网络获取可执行文件

从网络上获取可执行文件和获取图片很相似，在InternetTest类中添加getFile()方法，具体代码如下：

@Test

public void getFile() throws Exception {

// 首先我们要得到请求的路径 ,路径为我们想要得到的资源

String urlpath = "http://ftpcnc-js.pconline.com.cn/pub/download/

201003/Fetion_3.6.1900.exe";

URL url = new URL(urlpath); // 建立URL类对象,抛异常

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

// 得到urlConnection对象

conn.setRequestMethod("GET"); // 声明请求方式

conn.setConnectTimeout(6 * 1000); // 设置链接超时

if (conn.getResponseCode() == 200) {

InputStream inputStream = conn.getInputStream();

// 得到输入流

byte[] data = readInstream(inputStream); // 得到数据

File file = new File("feixin.exe"); // 创建保存文件

FileOutputStream outputStream = new FileOutputStream(file);

// 创建一个文件的输出流

outputStream.write(data);

// 把我们所得的二进制数据全部写入到我们建好的文件中

outputStream.close(); // 关闭输出流

}

25.1.2 Android客户端单线程下载

1．Android客户端从网络获取文本

2）源码再现

第一步：编写res下values中的string.xml文件。

<?xml version="1.0" encoding="utf-8"?>

<string name="hello">Hello World, DataActivity!</string>

<string name="app_name">从internet中获取数据</string>

</resources>

第二步：编写res下Layout中的main.xml文件。

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/path"

<EditText

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text=" http://i1.itc.cn/20100326/3b8_921a1797_8fb1_4551_

b4a3_dad3746f53fb_0.jpg "

android:id="@+id/path"

></EditText>

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/button"

android:id="@+id/button"

></Button>

<ImageView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:id="@+id/ImageView"

></ImageView>

</LinearLayout>

第三步：编写核心代码DataActivity.java。

package com.sharpandroid.activity;

import com.sharpandroid.net.utils.NetTool;

import android.app.Activity;

import android.content.Intent;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import
android.widget.ImageView;

import android.widget.Toast;

public class DataActivity extends Activity {

private static final String TAG ="DataActivity";

private EditText imageEditText;

private ImageView imageView;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

imageEditText = (EditText) this.findViewById(R.id.path);

//根据id得到EditText

imageView = (ImageView) this.findViewById(R.id.ImageView);

//根据 id得到imageView

Button button = (Button) this.findViewById(R.id.button);

//根据id得到button

button.setOnClickListener(new View.OnClickListener() {

//给button添加一个单击事件

@Override

public void onClick(View v) {

String path = imageEditText.getText().toString();//从imageEditText中取出

路径

try {

byte [] data =NetTool.getImage(path); //得到图片

Bitmap bm = BitmapFactory.decodeByteArray(data, 0, data.length);

imageView.setImageBitmap(bm);

} catch (Exception e) {

Log.i(TAG, e.getMessage());//有异常打印在控制台上

Toast.makeText(DataActivity.this, "获取图片失败", 1).show();

}

});

}

新建工具类NetTool.java。

package com.sharpandroid.net.utils;

import java.io.ByteArrayOutputStream;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

public class NetTool {

public static byte[] getImage(String path) throws Exception {

// 首先我们要得到请求的路径 ,路径为我们想要得到的资源

URL url = new URL(path); // 建立URL类对象,抛

异常

HttpURLConnection conn = (HttpURLConnection) url.openConnection();// 得到

urlConnection对象

conn.setRequestMethod("GET"); // 声明请求方式

conn.setConnectTimeout(6 * 1000); // 设置链接超时

if (conn.getResponseCode() == 200) {

InputStream inputStream = conn.getInputStream(); // 得到输入流

return readInstream(inputStream); // 返回得到的数组

}

return null;//

}

// 读取流文件的内容

public static byte[] readInstream(InputStream inputStream) throws

Exception {

ByteArrayOutputStream byteArrayOutputStream =

new ByteArrayOutputStream(); // 创建ByteArrayOutputStream类

byte[] buffer = new byte[1024]; // 声明缓冲区

int length = -1;// 定义读取默认的长度

while ((length = inputStream.read(buffer)) != -1) {

byteArrayOutputStream.write(buffer, 0, length);// 把缓存区中输

出到内存中

}

byteArrayOutputStream.close(); // 关闭输出流

inputStream.close();// 关闭输入流

return byteArrayOutputStream.toByteArray();// 返回这个输出流的字节数组

}

2．Android客户端从网络获取文本

1）实现流程

第一步，新添加两个布局文件：gettext.xml和text.xml。

gettext.xml中代码：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="vertical">

<EditText android:id="@+id/text"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="http://www.sohu.com"

></EditText>

<Button android:id="@+id/textbutton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/textbutton"

></Button>

</LinearLayout>

text.xml中的代码：

<?xml version="1.0" encoding="utf-8"?>

<ScrollView

xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width=fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical">

<TextView android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:id="@+id/sohu"/>

</ScrollView>

在main.xml文件中添加一个Button控件：

<Button android:id="@+id/totextbutton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/toTextButton"

></Button>

第二步：

（1）在NetTool.java类中添加方法getHtml()。

public static String getHtml(String path,String encoding) throws

Exception {

URL url = new URL(path); // 建立URL类对象,抛出异常

HttpURLConnection conn = (HttpURLConnection)

url.openConnection(); // 得到urlConnection对象

conn.setRequestMethod("GET"); // 声明请求方式

conn.setConnectTimeout(6 * 1000); // 设置链接超时

if (conn.getResponseCode() == 200) {

InputStream inputStream = conn.getInputStream();

// 得到输入流

byte[] data = readInstream(inputStream); // 得到数据

return new String(data,encoding);

//将字节转换为字符串打印在控制台上

}

return null;

}

（2）在DataActivity.java中添加totextbutton的单击事件。

Button totextbutton = (Button) this.findViewById(R.id.totextbutton);

totextbutton.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

Intent intent = new Intent(DataActivity.this,

SohuActivity.class);

startActivity(intent);

}

});

（3）在com.sharpandroid.activity中，新建一个继承了android.app.Activity的SohuActivity. java类。

package com.sharpandroid.activity;

import com.sharpandroid.net.utils.NetTool;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;

public class SohuActivity extends Activity {

private static final String TAG ="GetTextActivity";

private EditText editText;

private Button textButton;

private TextView textView;

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.gettext);

editText = (EditText) this.findViewById(R.id.text);

textButton = (Button) this.findViewById(R.id.textbutton);

textButton.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

String path = editText.getText().toString();

try {

String html = NetTool.getHtml(path,"GBK");

setContentView(R.layout.text);

textView = (TextView)SohuActivity.this.findViewById

(R.id.sohu);

textView.setText(html);

Toast.makeText(SohuActivity.this, "获取文本成功", Toast.

LENGTH_LONG).show();

} catch (Exception e) {

Toast.makeText(SohuActivity.this, "获取文本失败", Toast.

LENGTH_LONG).show();

e.printStackTrace();

}

});

}

25.2 Android文件多线程下载

25.2.1 J2SE文件多线程下载

源码再现：

package junit.test;

import java.io.InputStream;

import java.io.RandomAccessFile;

import java.net.HttpURLConnection;

import java.net.URL;

import org.junit.Test;

public class DownLoader {

@Test

public void download() throws Throwable{

String filename ="qqGame.exe";

String path="http://dl_dir.qq.com/minigamefile/QQGame2010Beta1

Patch1_setup_web.EXE";

URL url = new URL(path);

HttpURLConnection conn = (HttpURLConnection)url.openConnection();

conn.setConnectTimeout(5*1000);

conn.setRequestMethod("GET");

int filelength = conn.getContentLength(); //获取下载文件的长度

System.out.println(filelength);

RandomAccessFile file = new RandomAccessFile(filename, "rw");

file.setLength(filelength); //设置本地文件的长度

file.close();

conn.disconnect();

int threadsize = 3; //线程数

int threadlength=filelength % 3==0? filelength/3 : filelength/3+1;

//每条线程下载的长度

for(int i=0; i<threadsize ; i++){

int startposition = i * threadlength;

//计算每条线程应该从文件的什么位置开始下载

RandomAccessFile threadfile = new RandomAccessFile(filename,"

rw");

threadfile.seek(startposition);//从文件的什么位置开始写入数据

//启动3条线程分别从startposition指定的位置下载文件

new DownLoadThread(i, path, startposition, threadfile, threadl

ength).start();

}

int quit = System.in.read();

while('q' != quit){

Thread.sleep(2*1000);

}

private class DownLoadThread extends Thread{

private int threadid;

private int startposition;

private RandomAccessFile threadfile;

private int threadlength;

private String path;

public DownLoadThread(int threadid, String path, int startposition,

RandomAccessFile threadfile, int threadlength) {

this.threadid = threadid;

this.startposition = startposition;

this.threadfile = threadfile;

this.threadlength = threadlength;

this.path = path;

}

@Override

public void run() {

try {

URL url = new URL(path);

HttpURLConnection conn = (HttpURLConnection)url.openCon

nection();

conn.setConnectTimeout(5*1000);

conn.setRequestMethod("GET");

conn.setRequestProperty("Range", "bytes="+startposi

tion+ "-");

//指定从文件的什么位置开始下载

InputStream inStream = conn.getInputStream();

byte[] buffer = new byte[1024];

int len = -1;

int length = 0;

while(length<threadlength && (len = inStream.read

(buffer))!=-1){

threadfile.write(buffer, 0, len);

length += len; //累计下载的长度

}

threadfile.close();

inStream.close();

System.out.println("线程"+ (threadid+1)+ "已经下载完

成");

} catch (Exception e) {

System.out.println("线程"+ (threadid+1)+ "下载出错:"+ e);

}

25.2.2 Android客户端断点、多线程下载

1．准备阶段

String.xml中的代码：

<?xml version="1.0" encoding="utf-8"?>

<string name="hello">Hello World, DownLoaderActivity!</string>

<string name="app_name">多线程下载器</string>

<string name="sdcarderror">SDCard不存在或者写保护</string>

</resources>

Main.xml中的代码：

<?xml version="1.0" encoding="utf-8" ?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/

android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

<TextView android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/path" />

<EditText android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="http://

bj.itxiazai.com/soft/media/music/ITxiazai_ttpsetup_552.exe"android:id=

"@+id/path" />

<Button android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/button"

android:id="@+id/button" />

<ProgressBar android:layout_width="fill_parent"

android:layout_height="18dip"

style="?android:attr/progressBarStyleHorizontal"

android:id="@+id/progressBar" />

<TextView android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:gravity="center"

android:id="@+id/result" />

</LinearLayout>

2．数据库阶段

1）完成activity中的代码，给button添加单击事件

首先我们把我们页面上需要的控件都找出来。

public class DownLoaderActivity extends Activity {

private EditText pathText;

private TextView resultView;

private ProgressBar progressBar;

private Button button;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

resultView = (TextView) this.findViewById(R.id.result);

//文件的进度的信息

button = (Button) this.findViewById(R.id.button);

//得到下载按钮

progressBar = (ProgressBar)this.findViewById(R.id.downloadbar);

//得到下载的进度条

pathText = (EditText) this.findViewById(R.id.path);

//得到下载路径

button.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

}

});

}

2）在单击事件的onClick()方法中，下载文件并保存到SD卡中

下面是在这个类中的代码：

package com.sharpandroid.service;

import android.content.Context;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteOpenHelper;

public class DBOpenHelper extends SQLiteOpenHelper {

private static final String DBNAME = "sharpandroid.db";

private static final int VERSION = 1;

public DBOpenHelper(Context context) {

super(context, DBNAME, null, VERSION);

}

创建表：

@Override

public void onCreate(SQLiteDatabase db) {

db.execSQL("CREATE TABLE IF NOT EXISTS filedown (id integer primary

key autoincrement, downpath varchar(100), threadid INTEGER, position

INTEGER)");

}

对表的表本进行更新：

@Override

public void onUpgrade(SQLiteDatabase db, int oldVersion,int newVersion){

db.execSQL("DROP TABLE IF EXISTS filedown");

onCreate(db);

}

大致：呵呵，还是不错的嘛！下面我来完成在工程中需要的对线程相关的业务操作。

3）对各个线程的下载记录进行操作

FileService.java

import java.util.HashMap;

import java.util.Map;

import android.content.Context;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

/**

* 业务bean

public class FileService {

private DBOpenHelper openHelper;

public FileService(Context context) {

openHelper = new DBOpenHelper(context);

}

/**

* 获取线程最后下载位置

* @param path

* @return

public Map<Integer, Integer> getData(String path){

SQLiteDatabase db = openHelper.getReadableDatabase();

Cursor cursor = db.rawQuery("select threadid, position from

filedown where downpath=?", new String[]{path});

Map<Integer, Integer> data = new HashMap<Integer, Integer>();

while(cursor.moveToNext()){

data.put(cursor.getInt(0), cursor.getInt(1));

}

cursor.close();

db.close();

return data;

}

/**

* 保存下载线程初始位置

* @param path

* @param map

public void save(String path, Map<Integer, Integer> map){//int

threadid, int position

SQLiteDatabase db = openHelper.getWritableDatabase();

db.beginTransaction();

try{

for(Map.Entry<Integer, Integer> entry : map.entrySet()){

db.execSQL("insert into filedown(downpath, threadid,

position) values(?,?,?)",

new Object[]{path, entry.getKey(), entry.getValue()});

}

db.setTransactionSuccessful();

}finally{

db.endTransaction();

}

db.close();

}

/**

* 实时更新线程的最后下载位置

* @param path

* @param map

public void update(String path, Map<Integer, Integer> map){

SQLiteDatabase db = openHelper.getWritableDatabase();

db.beginTransaction();

try{

for(Map.Entry<Integer, Integer> entry : map.entrySet()){

db.execSQL("update filedown set position=? where downpath=?

and threadid=?",

new Object[]{entry.getValue(), path, entry.

getKey()});

}

db.setTransactionSuccessful();

}finally{

db.endTransaction();

}

db.close();

}

/**

* 当文件下载完成后，清掉该文件对应的下载记录

* @param path

public void delete(String path){

SQLiteDatabase db = openHelper.getWritableDatabase();

db.execSQL("delete from filedown where downpath=?", new Object

[]{path});

db.close();

}

3．实现文件下载阶段

新建com.sharpandroid.net.download包下FileDownloader.java类。

package com.sharpandroid.net.download;

import java.io.File;

import java.io.RandomAccessFile;

import java.net.HttpURLConnection;

import java.net.URL;

import java.util.LinkedHashMap;

import java.util.Map;

import java.util.UUID;

import java.util.concurrent.ConcurrentHashMap;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import com.sharpandroid.service.FileService;

import android.content.Context;

import android.util.Log;

/**

* 文件下载器

public class FileDownloader {

private Context context;

private FileService fileService;

private static final String TAG = "FileDownloader";

/* 已下载文件大小 */

private int downloadSize = 0;

/* 原始文件大小 */

private int fileSize = 0;

/* 线程数 */

private DownloadThread[] threads;

/* 下载路径 */

private URL url;

/* 本地保存文件 */

private File saveFile;

/* 下载记录文件 */

private File logFile;

/* 缓存各线程最后下载的位置*/

private Map<Integer, Integer> data = new ConcurrentHashMap<Integer,

Integer>();

/* 每条线程下载的大小 */

private int block;

private String downloadUrl;//下载路径

/**

* 获取线程数

public int getThreadSize() {

return threads.length;

}

/**

* 获取文件大小

* @return

public int getFileSize() {

return fileSize;

}

/**

* 累计已下载大小

* @param size

protected synchronized void append(int size) {

downloadSize += size;

}

/**

* 更新指定线程最后下载的位置

* @param threadId 线程id

* @param pos 最后下载的位置

protected void update(int threadId, int pos) {

this.data.put(threadId, pos);

}

/**

* 保存记录文件

protected synchronized void saveLogFile() {

this.fileService.update(this.downloadUrl, this.data);

}

第三步，构造下载器。

/**

* 构建文件下载器

* @param downloadUrl 下载路径

* @param fileSaveDir 文件保存目录

* @param threadNum 下载线程数

public FileDownloader(Context context,String downloadUrl,File fileSa

veDir,int threadNum) {

try {

this.context = context;

this.downloadUrl = downloadUrl;

fileService = new FileService(context);

this.url = new URL(downloadUrl);

if(!fileSaveDir.exists()) fileSaveDir.mkdirs();

this.threads = new DownloadThread[threadNum];

HttpURLConnection conn = (HttpURLConnection) url.openConn

ection();

conn.setConnectTimeout(6*1000);

conn.setRequestMethod("GET");

conn.setRequestProperty("Accept", "image/gif, image/jpeg,

image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/

xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap,

application/x-ms-application,application/vnd.ms-excel,application/vnd.m

s-powerpoint,

application/msword, */*");

conn.setRequestProperty("Accept-Language", "zh-CN");

conn.setRequestProperty("Referer", downloadUrl);

conn.setRequestProperty("Charset", "UTF-8");

conn.setRequestProperty("User-Agent","Mozilla/4.0

(compatible;MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET

CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR

3.5.30729)");

conn.setRequestProperty("Connection", "Keep-Alive");

conn.connect();

printResponseHeader(conn); //打印返回服务器的响应数据

if (conn.getResponseCode()==200) {

this.fileSize = conn.getContentLength();

//根据响应获取文件大小

if (this.fileSize <= 0) throw new RuntimeException("无法

获知文件大小");

String filename = getFileName(conn);

this.saveFile = new File(fileSaveDir, filename);

/* 保存文件 */

Map<Integer,Integer> logdata = fileService.getData

(downloadUrl);

if(logdata.size()>0){

data.putAll(logdata);

}

this.block = this.fileSize / this.threads.length + 1;

if(this.data.size()==this.threads.length){

for (int i = 0; i < this.threads.length; i++) {

this.downloadSize += this.data.get(i+1)-(this.

block * i);

}

print("已经下载的长度"+ this.downloadSize);

}

}else{

throw new RuntimeException("服务器响应错误 ");

}

} catch (Exception e) {

print(e.toString());

throw new RuntimeException("连接不到下载路径 ");

}

/**

* 获取文件名

private String getFileName(HttpURLConnection conn) {

String filename = this.url.toString().substring(this.url.toString

().lastIndexOf('/') + 1);

if(filename==null || "".equals(filename.trim())){

//如果获取不到文件名称

for (int i = 0;; i++) {

String mine = conn.getHeaderField(i);

if (mine == null) break;

if("content-disposition".equals(conn.getHeaderFieldKey

(i).toLowerCase())){

Matcher m = Pattern.compile(".*filename=(.*)").

matcher(mine.toLowerCase());

if(m.find()) return m.group(1);

}

filename = UUID.randomUUID()+ ".tmp";//默认取一个文件名

}

return filename;

}

第四步，实现下载功能，并同时可以得到此时各个线程的下载数量。

/**

* 开始下载文件

* @param listener 监听下载数量的变化,如果不需要了解实时下载的数量,可以设置为

null

* @return 已下载文件大小

* @throws Exception

public int download(DownloadProgressListener listener) throws

Exception{

try {

if(this.data.size() != this.threads.length){

this.data.clear();

for (int i = 0; i < this.threads.length; i++) {

this.data.put(i+1, this.block * i);

}

for (int i = 0; i < this.threads.length; i++) {

int downLength = this.data.get(i+1) - (this.block * i);

if(downLength < this.block && this.data.get(i+1)<this.

fileSize){ //该线程未完成下载时,继续下载

RandomAccessFile randOut = new RandomAccessFile(this.

saveFile, "rw");

if(this.fileSize>0) randOut.setLength(this.fileSize);

randOut.seek(this.data.get(i+1));

this.threads[i] = new DownloadThread(this, this.url,

randOut, this.block, this.data.get(i+1), i+1);

this.threads[i].setPriority(7);

this.threads[i].start();

}else{

this.threads[i] = null;

}

this.fileService.save(this.downloadUrl, this.data);

boolean notFinish = true; //下载未完成

while (notFinish) { // 循环判断是否下载完毕

Thread.sleep(900);

notFinish = false; //假定下载完成

for (int i = 0; i < this.threads.length; i++){

if (this.threads[i] != null && !this.threads[i].

isFinish()) {

notFinish = true; //下载没有完成

if(this.threads[i].getDownLength() == -1){

//如果下载失败,再重新下载

RandomAccessFile randOut = new RandomAcc

essFile(this.saveFile, "rw");

randOut.seek(this.data.get(i+1));

this.threads[i] = new DownloadThread(this,

this.url, randOut, this.block, this.data.get(i+1), i+1);

this.threads[i].setPriority(7);

this.threads[i].start();

}

if(listener!=null) listener.onDownloadSize(this.downloadSize);

}

fileService.delete(this.downloadUrl);

} catch (Exception e) {

print(e.toString());

throw new Exception("下载失败");

}

return this.downloadSize;

}

/**

* 获取HTTP响应头字段

* @param http

* @return

public static Map<String, String> getHttpResponseHeader(HttpURLConne

ction http) {

Map<String, String> header = new LinkedHashMap<String, String>();

for (int i = 0;; i++) {

String mine = http.getHeaderField(i);

//得到响应头的各个属性

if (mine == null) break;

header.put(http.getHeaderFieldKey(i), mine);

//得到各个属性值

}

return header;

}

/**

* 打印HTTP头字段

* @param http

public static void printResponseHeader(HttpURLConnection http){

Map<String, String> header = getHttpResponseHeader(http);

for(Map.Entry<String, String> entry : header.entrySet()){

String key = entry.getKey()!=null ? entry.getKey()+":" : "";

print(key+ entry.getValue());

}

private static void print(String msg){

Log.i(TAG, msg);

}

编写DownloadThread.java：

package com.sharpandroid.net.download;

import java.io.InputStream;

import java.io.RandomAccessFile;

import java.net.HttpURLConnection;

import java.net.URL;

import android.util.Log;

public class DownloadThread extends Thread {

private static final String TAG = "DownloadThread";

private RandomAccessFile saveFile;

private URL downUrl;

private int block;

/* 下载开始位置 */

private int threadId = -1;

private int startPos;

private int downLength;

private boolean finish = false;

private FileDownloader downloader;

public DownloadThread(FileDownloader downloader, URL downUrl,

RandomAccessFile saveFile, int block, int startPos, int threadId) {

this.downUrl = downUrl;

this.saveFile = saveFile;

this.block = block;

this.startPos = startPos;

this.downloader = downloader;

this.threadId = threadId;

this.downLength = startPos - (block * (threadId - 1));

}

@Override

public void run() {

if(downLength < block){//未下载完成

try {

HttpURLConnection http = (HttpURLConnection) downUrl.

openConnection();

http.setRequestMethod("GET");

http.setRequestProperty("Accept", "image/gif,

image/jpeg,image/pjpeg, image/pjpeg, application/x-shockwave-flash,

application/xaml+xml, application/vnd.ms-xpsdocument, application/

x-ms-xbap,application/x-ms-application,application/vnd.ms-excel,applica

tion/vnd.ms-powerpoint, application/msword, */*");

http.setRequestProperty("Accept-Language", "zh-CN");

http.setRequestProperty("Referer", downUrl.toString());

http.setRequestProperty("Charset", "UTF-8");

http.setRequestProperty("Range", "bytes=" + this.

startPos + "-");

http.setRequestProperty("User-Agent", "Mozilla/4.0

(compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET

CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR

3.5.30729)");

http.setRequestProperty("Connection", "Keep-Alive");

InputStream inStream = http.getInputStream();

int max = block>1024 ? 1024 : (block>10 ? 10 : 1);

byte[] buffer = new byte[max];

int offset = 0;

print("线程 " + this.threadId + "从位置"+ this.startPos+

"开始下载 ");

while(downLength < block && (offset=inStream.read(buffer,0,

max)) != -1) {

saveFile.write(buffer, 0, offset);

downLength += offset;

downloader.update(this.threadId, block * (threadId –

1) + downLength);

downloader.saveLogFile();

downloader.append(offset);

int spare = block-downLength;//求剩下的字节数

if(spare < max) max = (int) spare;

}

saveFile.close();

inStream.close();

print("线程 " + this.threadId + "完成下载 ");

this.finish = true;

this.interrupt();

} catch (Exception e) {

this.downLength = -1;

print("线程"+ this.threadId+ ":"+ e);

}

private static void print(String msg){

Log.i(TAG, msg);

}

/**

* 下载是否完成

* @return

public boolean isFinish() {

return finish;

}

/**

* 已经下载的内容大小

* @return 如果返回值为-1,代表下载失败

public long getDownLength() {

return downLength;

}

编写DownloadProgressListener.java：

package com.sharpandroid.net.download;

public interface DownloadProgressListener {

public void onDownloadSize(int size);

}

完成Activity中的内容：

package com.sharpandroid.download.activity;

import java.io.File;

import com.sharpandroid.net.download.DownloadProgressListener;

import com.sharpandroid.net.download.FileDownloader;

import android.app.Activity;

import android.os.Bundle;

import android.os.Environment;

import android.os.Handler;

import android.os.Message;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.ProgressBar;

import android.widget.TextView;

import android.widget.Toast;

public class DownLoaderActivity extends Activity {

private static final String TAG = "DownLoaderActivity";

private EditText pathText;

private ProgressBar progressBar;

private TextView resultView;

private Handler handler = new Handler(){

@Override

public void handleMessage(Message msg) {

if(!Thread.currentThread().isInterrupted()){

switch (msg.what) {

case 1:

int size = msg.getData().getInt("size");

progressBar.setProgress(size);//设置当前刻度

int result =(int)(((float)progressBar.getProgress()/

(float)progressBar.getMax()) * 100);

resultView.setText(result+ "%");

if(progressBar.getMax()==progressBar.getProgress()){

Toast.makeText(DownLoaderActivity.this, R.

string.success, 1).show();

}

break;

case -1:

String error = msg.getData().getString("error");

Toast.makeText(DownLoaderActivity.this, error, 1).

show();

break;

}

super.handleMessage(msg);

}

};//用于往线程绑定的消息队列中发送或者处理消息

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

pathText = (EditText)findViewById(R.id.path);

progressBar = (ProgressBar)findViewById(R.id.progressBar);

resultView = (TextView)findViewById(R.id.result);

Button button = (Button)findViewById(R.id.button);

button.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

//下载文件,并保存到SDCard

if(Environment.getExternalStorageState().equals

(Environment.MEDIA_MOUNTED)){

try {

download(pathText.getText().toString(),

Environment.getExternalStorageDirectory());//1

} catch (Exception e) {

Toast.makeText(DownLoaderActivity.this,

R.string.fail, 1).show();

Log.e(TAG, e.toString());

}

}else{

Toast.makeText(DownLoaderActivity.this,

R.string.sdcarderror, 1).show();

}

});

}

//运行在主线程(UI线程负责显示控件的显示更新[重绘界面])

private void download(final String path, final File saveDir) throws

Exception{

new Thread(new Runnable() {

@Override

public void run() {

try {

FileDownloader downloader = new FileDownloader

(DownLoaderActivity.this, path, saveDir, 3);

progressBar.setMax(downloader.getFileSize());

//设置进度条的最大刻度

downloader.download(new DownloadProgressListener() {

@Override

public void onDownloadSize(int size) {

//得到文件实时的下载长度

Message msg = new Message();

msg.what = 1;

msg.getData().putInt("size", size);

handler.sendMessage(msg);

}

});

} catch (Exception e) {

Message msg = new Message();

msg.what = -1;

msg.getData().putString("error", "下载失败");

handler.sendMessage(msg);

Log.e(TAG, e.toString());

}

}).start();

}

在download方法中的代码：

try {loader.download(new DownloadProgressListener() {

@Override

public void onDownloadSize(int size) {//得到当前下载的数量 ...

msg.setData(data);

handler.sendMessage(msg);

}

在Handle的内部类的中的代码：

public void handleMessage(Message msg) {

if(!Thread.currentThread().isInterrupted()){

...

Toast.makeText(DownLoadActivity.this, error, 1).show();

break;

}

super.handleMessage(msg);

}

};

最后在AndroidManifest.xml加入相关的权限：

<!--

访问internet权限

-->

<uses-permission android:name="android.permission.INTERNET" />

- <!--

在SDCard中创建与删除文件权限

-->

<uses-permission android:name="android.permission.

MOUNT_UNMOUNT_FILESYSTEMS" />

- <!--

往SDCard写入数据权限

-->

<uses-permission android:name="android.permission.

WRITE_EXTERNAL_STORAGE" />

26 Android文件上传

26.1 Android客户端上传初体验

26.1.1 知识回顾

3．第三步，核心代码实现

新建一个Contact.java类：

package com.sharpandroid.domain;

public class Contact {

private Integer id;

private String name;

private short age;

public Contact(){

}

public Contact(Integer id, String name, short age) {

super();

this.id = id;

this.name = name;

this.age = age;

}

public Integer getId() {

return id;

}

public void setId(Integer id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public short getAge() {

return age;

}

public void setAge(short age) {

this.age = age;

}

新建ContactAction类图解。

package com.sharpandroid.action;

import java.util.ArrayList;

import java.util.List;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import com.sharpandroid.domain.Contact;

public class ContactAction extends Action {

@Override

public ActionForward execute(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response)

throws Exception {

List<Contact> contacts = new ArrayList<Contact>();

contacts.add(new Contact(01, "laoli", (short) 25));

contacts.add(new Contact(02, "laozhang", (short) 28));

contacts.add(new Contact(03,"laowen",(short) 30));

contacts.add(new Contact(04,"laohou ",(short) 29));

request.setAttribute("contacts", contacts);

return mapping.findForward("contacts");

}

26.1.2 Android客户端直通CRM系统

2．第二步，核心代码实现

2）新建一个Contact.java实体类

package com.sharpandroid.domain;

public class Contact {

private Integer id;

private String name;

private short age;

public Contact(){

}

public Contact(Integer id, String name, short age) {

super();

this.id = id;

this.name = name;

this.age = age;

}

public Integer getId() {

return id;

}

public void setId(Integer id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public short getAge() {

return age;

}

public void setAge(short age) {

this.age = age;

}

@Override

public String toString() {

return "Contact [age=" + age + ", id=" + id + ", name=" + name

+ "]";

}

代码解析：

分别定义了联系人Contact对象的id、name、age属性，并生成有参数和无参数的构造方法以及相应的set和get方法，为了后面输出的需要，覆盖它的toString方法。

3）建立一个ContactService.java业务bean

package com.sharpandroid.service;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import java.util.List;

import javax.xml.parsers.SAXParser;

import javax.xml.parsers.SAXParserFactory;

import com.sharpandroid.domain.Contact;

public class ContactService{

/**

* 获取CRM返回的客户数据

* @return

private static InputStream requestContact() throws Exception{

String path = "http://192.168.1.100:8080/CRM/contacts.do";

URL url = new URL(path);

HttpURLConnection conn =(HttpURLConnection)url.openConnection();

conn.setConnectTimeout(5 * 1000);

conn.setRequestMethod("GET");

return conn.getInputStream();

}

4）新建一个继承org.xml.sax.helpers.DefaultHandler的ContactDefaultHandler.java类

package com.sharpandroid.service;

import java.util.ArrayList;

import java.util.List;

import org.xml.sax.Attributes;

import org.xml.sax.SAXException;

import org.xml.sax.helpers.DefaultHandler;

import com.sharpandroid.domain.Contact;

public class ContactDefaultHandler extends DefaultHandler {

private List<Contact> contacts;

private Contact contact;//记录当前person

private String preTag;//记录前一个标签的名称

public List<Contact> getContacts() {

return contacts;

}

/**

* 第一个参数为：整个xml字符串

@Override

public void characters(char[] ch, int start, int length) throws

SAXException {

if(preTag!=null){

String data = new String(ch, start, length);

if("name".equals(preTag)){

contact.setName(data);

}else if("age".equals(preTag)){

contact.setAge(new Short(data));

}

//适合在此方法完成初始化行为

@Override

public void startDocument() throws SAXException {

contacts = new ArrayList<Contact>();

}

@Override

public void startElement(String uri, String localName, String qName,

Attributes attributes) throws SAXException {

if("contact".equals(localName)){

Integer id = new Integer(attributes.getValue(0));

contact = new Contact();

contact.setId(id);

}

preTag = localName;

}

@Override

public void endElement(String uri, String localName, String qName)

throws SAXException {

if("contact".equals(localName)){

contacts.add(contact);

contact = null;

}

preTag = null;

}

。

5）在ContactService类中创建getContacts()方法

public static List<Contact> getContacts() throws Exception{

InputStream inputStream = requestContact();

SAXParserFactory factory = SAXParserFactory.newInstance();

SAXParser saxParser = factory.newSAXParser();

ContactDefaultHandler handler = new ContactDefaultHandler();

saxParser.parse(inputStream, handler);

inputStream.close();

return handler.getContacts();

}

6）在com.sharpandroid.com.activity中建立单元测试类ContactTest.java

public class ContactTest extends AndroidTestCase {

private static final String TAG = "ContactTest";

public void testContacts() throws Throwable{

List<Contact> contacts = ContactService.getContacts();

for(Contact contact : contacts){

Log.i(TAG, contact.toString());

}

26.2 Android客户端实现请求参数数据上传

26.2.1 知识回顾

2．第二步，核心代码实现

1）新建一个客户信息实体

继承了org.apache.struts.action.ActionForm的ContactForm。

package com.sharpandroid.formbean;

import org.apache.struts.action.ActionForm;

public class ContactForm extends ActionForm {

private String name;

private short age;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public short getAge() {

return age;

}

public void setAge(short age) {

this.age = age;

}

2）新建一个处理业务操作ContactManageAction.java类

package com.sharpandroid.action;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.actions.DispatchAction;

import com.sharpandroid.formbean.ContactForm;

public class ContactManageAction extends DispatchAction {

//保存数据

public ActionForward save(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response)

throws Exception {

ContactForm formbean = (ContactForm)form;

System.out.println("name="+ formbean.getName());//姓名

System.out.println("age="+ formbean.getAge());//年龄

return mapping.findForward("result");

}

26会那么高呢，原来里面有这么多的学问啊！

第一步，业务分析

新建一个单元测试类。

package com.sharpandroid.test;

import java.io.DataOutputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import org.junit.Test;

public class SendDataToCRMTest {

private String name;

private Short age;

@Test

public void testSave() throws Exception{

save(name,age);

}

新建testSave()单元测试方法：

private void save(String name, Short age) throws Exception{

String path ="http://192.168.1.100:8080/CRM/contact/

manage.do";

String params ="method=save&name=li&age=36";

byte[] data = params.getBytes();

URL url = new URL(path);

HttpURLConnection conn = (HttpURLConnection)url.

openConnection();

conn.setDoOutput(true); //允许对外发送请求参数

conn.setUseCaches(false); //不进行缓存

conn.setConnectTimeout(5 * 1000);

conn.setRequestMethod("POST");

//下面设置http请求头

conn.setRequestProperty("Accept", "image/gif, image/jpeg, image/pjpeg,

image/pjpeg, application/x-shockwave-flash, application/xaml+xml,

application/vnd.ms-xpsdocument, application/x-ms-xbap, application/vnd.

application/x-ms-application, application/vnd.ms-excel, ms-powerpoint,

application/msword, */*");

conn.setRequestProperty("Accept-Language", "zh-CN");

conn.setRequestProperty("User-Agent", "Mozilla/4.0

(compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET

CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR

3.5.30729)");

conn.setRequestProperty("Content-Type", "application/

x-www-form-urlencoded");

conn.setRequestProperty("Content-Length", String.valueOf

(data.length));

conn.setRequestProperty("Connection", "Keep-Alive");

//发送参数

DataOutputStream outStream = new DataOutputStream

(conn.getOutputStream());

outStream.write(data); //把参数发送出去

outStream.flush();

outStream.close();

if(conn.getResponseCode()==200){

byte[] returndata = StreamTool.readInputStream(conn.

getInputStream());

System.out.print(new String(returndata));

}

编写StreamTool.java：

public class StreamTool {

public static byte[] readInputStream(InputStream inputStream) throws

Exception {

byte[] buffer = new byte[1024];

int len = -1;

ByteArrayOutputStream outSteam = new ByteArrayOutputStream();

while( (len = inputStream.read(buffer)) != -1 ){

outSteam.write(buffer, 0, len);

}

outSteam.close();

inputStream.close();

return outSteam.toByteArray();

}

26.2.3 Android客户端之请求参数优化

1．解决Android客户端的中文乱码问题

1）第一种情况，J2EE中表单的post提交上传数据中文乱码问题

用这种方式建立Filter可以自动在web.xml文件中进行配置：

<display-name>EncodingFilter</display-name>

<filter-name>EncodingFilter</filter-name>

<filter-class>com.sharpandroid.filter.EncodingFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>EncodingFilter</filter-name>

<url-pattern>*.do</url-pattern>

</filter-mapping>

程序代码：

package com.sharpandroid.filter;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletRequest;

public class EncodingFilte implements Filter {

public void doFilter(ServletRequest request, ServletResponse response,

FilterChain chain) throws IOException, ServletException {

HttpServletRequest req = (HttpServletRequest) request;

req.setCharacterEncoding("UTF-8");

chain.doFilter(request, response);

}

public void init(FilterConfig fConfig) throws ServletException {

}

public void destroy() {

}

3）第三种，解决客户端应用中get方式发送请求参数中文乱码问题

实现代码如下：

@Test

public void testGetSendData() throws Throwable{

//以get方式发送请求参数

String path = "http://192.168.1.100:8080/CRM/contact/

manage.do?method=save&name="+ URLEncoder.encode("世界","UTF-8") + "

&age=30";

URL url = new URL(path);

HttpURLConnection conn = (HttpURLConnection)url.

openConnection();

conn.setConnectTimeout(5 * 1000);

conn.setRequestMethod("GET");

if(conn.getResponseCode()==200){

byte[] data = StreamTool.readInputStream(conn.

getInputStream());

System.out.println(new String(data));;

}

2．Android客户端post方式发送请求参数优化

post()方法具体代码如下：

public static byte[] post(String path,Map<String, String> params,String

encode) throws Exception{

StringBuilder paramBuilder = new StringBuilder();

if(params!=null && !params.isEmpty()){

for(Map.Entry<String, String> entry : params.entrySet()){

paramBuilder.append(entry.getKey()).append("=").append

(URLEncoder.encode(entry.getValue(), encode))

.append("&");

}

paramBuilder.deleteCharAt(paramBuilder.length()-1);

}

byte[] data = paramBuilder.toString().getBytes();

URL url = new URL(path);

HttpURLConnection conn = (HttpURLConnection)url.openConnection();

conn.setDoOutput(true);//允许对外发送请求参数

conn.setUseCaches(false);//不进行缓存

conn.setConnectTimeout(5 * 1000);

conn.setRequestMethod("POST");

//下面设置http请求头

conn.setRequestProperty("Accept", "image/gif, image/jpeg,

image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/

xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, appl

ication/x-ms-application, application/vnd.ms-excel, application/vnd.

ms-powerpoint, application/msword, */*");

conn.setRequestProperty("Accept-Language", "zh-CN");

conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible;

MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR

2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR

3.5.30729)");

conn.setRequestProperty("Content-Type", "application/x-www-

form-urlencoded");

conn.setRequestProperty("Content-Length", String.valueOf(data.

length));

conn.setRequestProperty("Connection", "Keep-Alive");

//发送参数

DataOutputStream outStream = new DataOutputStream(conn.

getOutputStream());

outStream.write(data);//把参数发送出去

outStream.flush();

outStream.close();

if(conn.getResponseCode()==200){

return StreamTool.readInputStream(conn.getInputStream());

}

return null;

}

26.2.4 Android客户端之发送内容实体

1．自定义HTTP协议发送内容实体

核心代码sendXML方法实现：

/**

* 发送内容

* @param path //请求路径

* @param xml //XML数据

public static byte[] sendXML(String path, String xml) throws Exception{

byte[] data = xml.getBytes(); //要发送的实体数据

URL url = new URL(path);

HttpURLConnection conn = (HttpURLConnection)url.openConnection();

conn.setDoOutput(true); //允许对外发送请求参数

conn.setUseCaches(false); //不进行缓存

conn.setConnectTimeout(5 * 1000);

conn.setRequestMethod("POST");

//下面设置http请求头

conn.setRequestProperty("Accept", "image/gif, image/jpeg,

image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/

xaml+xml,application/vnd.ms-xpsdocument,application/x-ms-xbap,applicati

on/x-ms-application, application/vnd.ms-excel, application/vnd.ms-

powerpoint, application/msword, */*");

conn.setRequestProperty("Accept-Language", "zh-CN");

conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible;

MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR

2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR

3.5.30729)");

conn.setRequestProperty("Content-Type", "text/xml; charset=

UTF-8");

conn.setRequestProperty("Content-Length", String.valueOf(data.

length));

conn.setRequestProperty("Connection", "Keep-Alive");

//发送参数

DataOutputStream outStream = new DataOutputStream(conn.

getOutputStream());

outStream.write(data); //把XML数据发送出去

outStream.flush();

outStream.close();

if(conn.getResponseCode()==200){

return StreamTool.readInputStream(conn.getInputStream());

}

return null;

}

2．写一个单元测试方法准备实体并调用sendXML方法

testsendXML()方法源码：

@Test

public void testsendXML()throws Throwable{

String path = "http://192.168.1.100:8080/CRM/contact/manage.do?

method=getXML";

String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>

</persons>";

sendXML(path, xml);

}

3．在CRM客户关系管理系统接受实体

getXML方法源码：

public ActionForward getXML(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response)

throws Exception {

InputStream inStream = request.getInputStream();

byte[] data = StreamTool.readInputStream(inStream);

String xml = new String(data);

System.out.println(xml);

return mapping.findForward("result");

}

26.2.5 Android客户端发送数据参数到服务器

1．第一种，Android客户端实现post方式发送数据到服务器

1）完成View层

String.xml的代码：

<?xml version="1.0" encoding="utf-8"?>

<string name="hello">Hello World, ContactActivity!</string>

<string name="app_name">CRM客户端</string>

</resources>

Main.xml的代码：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/name"

<EditText android:id="@+id/name"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

></EditText>

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/age"

<EditText android:id="@+id/age"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

></EditText>

<Button android:id="@+id/button"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/button"

></Button>

</LinearLayout>

2）核心代码实现——Controll层

package com.sharpandroid.crm.activity;

import com.sharpandroid.service.ContactService;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

public class ContactActivity extends Activity {

private static final String TAG = "ContactActivity";

private EditText nameText;

private EditText ageText;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

nameText = (EditText) this.findViewById(R.id.name);

ageText = (EditText) this.findViewById(R.id.age);

Button button = (Button) this.findViewById(R.id.button);

button.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

String name = nameText.getText().toString();

String age = ageText.getText().toString();

try {

ContactService.save(name, new Short(age));

Toast.makeText(ContactActivity.this, R.string.

success, 1).show();

} catch (Exception e) {

Toast.makeText(ContactActivity.this, R.string.fail,

1).show();

Log.e(TAG, e.toString());

}

});

}

3）业务模型实现——Model层

在ContactService业务bean中实现数据上传的功能，具体代码如下：

public static void save(String name,Short age) throws Exception{

String path = "http://192.168.1.100:8080/CRM/contact/

manage.do";

Map<String, String> params = new HashMap<String, String>();

params.put("method", "save");

params.put("name", name);

params.put("age", String.valueOf(age));

post(path, params, "UTF-8");

}

（2）params.put("age", String.valueOf(age))

要将age进行类型转换成需要的String类型。

public static byte[] post(String path,Map<String, String>

params,String encode) throws Exception{

StringBuilder paramBuilder = new StringBuilder();

if(params!=null && !params.isEmpty()){

for(Map.Entry<String, String> entry : params.entrySet()){

paramBuilder.append(entry.getKey()).append("=").append

(URLEncoder.encode(entry.getValue(), encode))

.append("&");

}

paramBuilder.deleteCharAt(paramBuilder.length()-1);

}

byte[] data = paramBuilder.toString().getBytes();

URL url = new URL(path);

HttpURLConnection conn = (HttpURLConnection)url.

openConnection();

conn.setDoOutput(true);//允许对外发送请求参数

conn.setUseCaches(false);//不进行缓存

conn.setConnectTimeout(5 * 1000);

conn.setRequestMethod("POST");

//下面设置http请求头

conn.setRequestProperty("Accept", "image/gif, image/jpeg,

image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/

xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap,

application/x-ms-application, application/vnd.ms-excel, application/

vnd.ms-powerpoint, application/msword, */*");

conn.setRequestProperty("Accept-Language", "zh-CN");

conn.setRequestProperty("User-Agent", "Mozilla/4.0

(compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET

CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR

3.5.30729)");

conn.setRequestProperty("Content-Type", "application/x-

www-form-urlencoded");

conn.setRequestProperty("Content-Length", String.valueOf

(data.length));

conn.setRequestProperty("Connection", "Keep-Alive");

//发送参数

DataOutputStream outStream = new DataOutputStream(conn.

getOutputStream());

outStream.write(data); //把参数发送出去

outStream.flush();

outStream.close();

if(conn.getResponseCode()==200){

return StreamTool.readInputStream(conn.getInputStream());

}

return null;

}

2．第二种，Android客户端实现get方式发送数据到服务器

在ContactService业务bean中添加GetSendData()方法：

public static void GetSendData(String name,Short age) throws Exception{

//以get方式发送请求参数

String path = "http://192.168.1.100:8080/CRM/contact/manage.

do?method=save&name="+

URLEncoder.encode(name,"UTF-8") + "&age="+age;

URL url = new URL(path);

HttpURLConnection conn = (HttpURLConnection)url.

openConnection();

conn.setConnectTimeout(5 * 1000);

conn.setRequestMethod("GET");

if(conn.getResponseCode()==200){

byte[] data = StreamTool.readInputStream(conn.

getInputStream());

System.out.println(new String(data));;

}

3．用开源框架实现Android客户端发送实体

在ContactService业务bean添加postFromHttpClient()方法：

public static byte[] postFromHttpClient(String path, Map<String, String>

params, String encode) throws Exception{

List<NameValuePair> formparams = new ArrayList<NameValuePair>(); for(Map.Entry<String, String> entry : params.entrySet()){

formparams.add(new BasicNameValuePair(entry.getKey(), entry.

getValue()));

}

UrlEncodedFormEntity entity = new UrlEncodedFormEntity

(formparams, "UTF-8");

HttpPost httppost = new HttpPost(path);

httppost.setEntity(entity);

HttpClient httpclient = new DefaultHttpClient();

//看做是浏览器

HttpResponse response = httpclient.execute(httppost);

//发送post请求

return StreamTool.readInputStream(response.getEntity().

getContent());

}

26.3 Android客户端实现文件上传

26.3.1 知识回顾

1）业务模型实现——Model层

在ContactForm中定义上传的参数类型：

Com.sharpandroid.formbean.ContactForm.java

public class ContactForm extends ActionForm {

private String name;

private Short age;

private FormFile image;

public FormFile getImage() {

return image;

}

public void setImage(FormFile image) {

this.image = image;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Short getAge() {

return age;

}

public void setAge(Short age) {

this.age = age;

}

2）核心代码实现——Controll层

save()方法源码：

public ActionForward save(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response)

throws Exception {

ContactForm formbean = (ContactForm)form;

//System.out.println("get : name="+ new String(request.

getParameter("name").getBytes("ISO-8859-1"),"UTF-8"));

System.out.println("name="+ formbean.getName());

System.out.println("age="+ formbean.getAge());

if(formbean.getImage()!=null && formbean.getImage().

getFileSize()>0){

String dirRealPath = request.getSession().getServletContext().

getRealPath("/images");

System.out.println(dirRealPath);

File dir = new File(dirRealPath);

if(!dir.exists()) dir.mkdirs();

File saveFile = new File(dir, formbean.getImage().

getFileName());

FileOutputStream outStream = new FileOutputStream(saveFile);

outStream.write(formbean.getImage().getFileData());

outStream.close();

}

return mapping.findForward("result");

}

3）页面美化——View层

index.jsp页面中的代码：

<body>

<form action="${pageContext.request.contextPath}/contact/manage.

do" method="post" enctype="multipart/form-data">

姓名：<input type="text" name="name"/><br/>

年龄：<input type="text" name="age"/><br/>

图片：<input type="file" name="image"/><br/>

</form>

</body>

26.3.2 Android客户端之文件上传

1）模型实现——Model层

FormFile.java 源代码：

import java.io.InputStream;

/**

* 上传文件

public class FormFile {

private byte[] data;

private InputStream inStream;

private String filname;

private String formname;

private String contentType = "application/octet-stream";

public FormFile(String filname, byte[] data, String formname, String

contentType) {

this.data = data;

this.filname = filname;

this.formname = formname;

if(contentType!=null) this.contentType = contentType;

}

public FormFile(String filname, InputStream inStream, String formname,

String contentType) {

this.filname = filname;

this.formname = formname;

this.inStream = inStream;

if(contentType!=null) this.contentType = contentType;

}

public InputStream getInStream() {

return inStream;

}

public byte[] getData() {

return data;

}

public String getFilname() {

return filname;

}

public void setFilname(String filname) {

this.filname = filname;

}

public String getFormname() {

return formname;

}

public void setFormname(String formname) {

this.formname = formname;

}

public String getContentType() {

return contentType;

}

public void setContentType(String contentType) {

this.contentType = contentType;

}

通过面向HTTP协议，实现如下面表单提交功能，具体的代码如下：

package com.sharpandroid.utils;

import java.io.DataOutputStream;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import java.util.Map;

public class HttpRequester {

public static String post(String actionUrl, Map<String, String> params,

FormFile[] files) {

try {

String BOUNDARY = "---------7d4a6d158c9"; //数据分隔线

String MULTIPART_FORM_DATA = "multipart/form-data";

URL url = new URL(actionUrl);

HttpURLConnection conn = (HttpURLConnection)

url.openConnection();

conn.setConnectTimeout(5* 1000);

conn.setDoInput(true); //允许输入

conn.setDoOutput(true); //允许输出

conn.setUseCaches(false); //不使用Cache

conn.setRequestMethod("POST");

conn.setRequestProperty("Connection", "Keep-Alive");

conn.setRequestProperty("Charset", "UTF-8");

conn.setRequestProperty("Content-Type", MULTIPART_FORM_DATA

+ "; boundary=" + BOUNDARY);

StringBuilder sb = new StringBuilder();

for (Map.Entry<String, String> entry : params.entrySet()) {

//构建表单字段内容

sb.append("--");

sb.append(BOUNDARY);

sb.append("\r\n");

sb.append("Content-Disposition: form-data; name=\""+

entry.getKey() + "\"\r\n\r\n");

sb.append(entry.getValue());

sb.append("\r\n");

}

DataOutputStream outStream = new DataOutputStream

(conn.getOutputStream());

outStream.write(sb.toString().getBytes()); //发送表单字段数据

for(FormFile file : files){ //发送文件数据

StringBuilder split = new StringBuilder();

split.append("--");

split.append(BOUNDARY);

split.append("\r\n");

split.append("Content-Disposition: form-data;name=\""+

file.getFormname()+"\";filename=\""+ file.getFilname() + "\"\r\n");

split.append("Content-Type: "+ file.getContentType()+"

\r\n\r\n");

outStream.write(split.toString().getBytes());

if(file.getInStream()!=null){

byte[] buffer = new byte[1024];

int len = 0;

while((len = file.getInStream().read(buffer))!=-1){

outStream.write(buffer, 0, len);

}

file.getInStream().close();

}else{

outStream.write(file.getData(), 0, file.getData().length);

}

outStream.write("\r\n".getBytes());

}

byte[] end_data = ("--" + BOUNDARY + "--\r\n").getBytes();

//数据结束标志

outStream.write(end_data);

outStream.flush();

int cah = conn.getResponseCode();

if (cah != 200) throw new RuntimeException("请求url失败");

InputStream is = conn.getInputStream();

int ch;

StringBuilder b = new StringBuilder();

while( (ch = is.read()) != -1 ){

b.append((char)ch);

}

outStream.close();

conn.disconnect();

return b.toString();

} catch (Exception e) {

throw new RuntimeException(e);

}

public static String post(String actionUrl, Map<String, String> params,

FormFile file) {

return post(actionUrl, params, new FormFile[]{file});

}

HttpRequester.java上传数据模型如下：

* 直接通过HTTP协议提交数据到服务器,实现如下面表单提交功能

* <FORM METHOD=POST ACTION="http://192.168.0.200:8080/ssi/

fileload/test.do" enctype="multipart/form-data">

</FORM>

* @param actionUrl 上传路径(注：避免使用localhost或127.0.0.1这样的路径

测试，因为它会指向手机模拟器，你可以使用像http://192.168.1.10:8080这样的路径测试)

* @param params 请求参数 key为参数名,value为参数值

* @param file 上传文件

构造一个数据的内容：

{

sb.append("--");

sb.append(BOUNDARY);

sb.append("\r\n");

sb.append("Content-Disposition: form-data; name=\""+ entry.getKey()

+ "\"\r\n\r\n");

sb.append(entry.getValue());

sb.append("\r\n");

}

sb.append("--");

sb.append(BOUNDARY);

文件可能有很多，我们构造一个，然后去迭代。

split.append("--");

split.append(BOUNDARY);

split.append("\r\n");

split.append("Content-Disposition: form-data;name=\""+ file.

getFormname()+"\";filename=\""+ file.getFilname() + "\"\r\n");

split.append("Content-Type: "+ file.getContentType()+

"\r\n\r\n");

outStream.write(split.toString().getBytes());

if(file.getInStream()!=null){

byte[] buffer = new byte[1024];

int len = 0;

while((len = file.getInStream().read(buffer))!=-1){

outStream.write(buffer, 0, len);

}

file.getInStream().close();

}else{

outStream.write(file.getData(), 0, file.getData().length);

}

outStream.write("\r\n".getBytes());

}

byte[] end_data = ("--" + BOUNDARY + "--\r\n").getBytes();//

数据结束标志

sb.append("--");

sb.append(BOUNDARY);

2）核心代码实现——Controll层

编写ContactActivity.java：

package com.sharpandroid.crm.activity;

import java.io.File;

import java.io.FileInputStream;

import com.sharpandroid.service.ContactService;

import com.sharpandroid.utils.FormFile;

import android.app.Activity;

import android.os.Bundle;

import android.os.Environment;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

public class ContactActivity extends Activity {

private static final String TAG = "ContactActivity";

private EditText nameText;

private EditText ageText;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

nameText = (EditText) this.findViewById(R.id.name);

ageText = (EditText) this.findViewById(R.id.age);

Button button = (Button) this.findViewById(R.id.button);

button.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

String name = nameText.getText().toString();

String age = ageText.getText().toString();

try {

String filename = " android.jpg";

FileInputStream inStream = new FileInputStream(new

File(Environment.getExternalStorageDirectory(), filename));

FormFile file = new FormFile(filename, inStream, "

image", "image/pjpeg");

ContactService.save(name, new Short(age), file);

Toast.makeText(ContactActivity.this, R.string.

success, 1).show();

} catch (Exception e) {

Toast.makeText(ContactActivity.this, R.string.fail,

1).show();

Log.e(TAG, e.toString());

}

});

}

在ContactActivity.java中构建FormFile ContactActivity.java 关键代码：

String filename = " android.jpg";

FileInputStream inStream = new FileInputStream(new File(Environment.

getExternalStorageDirectory(), filename));

FormFile file = new FormFile(filename, inStream, "image", "image/

pjpeg");

ContactService.save(name, new Short(age), file);

在ContactService.java中完成带文件的save()方法：

public static void save(String name, Short age, FormFile file) throws

Exception{

String path = "http://192.168.1.100:8080/CRM/contact/manage.do";

Map<String, String> params = new HashMap<String, String>();

params.put("method", "save");

params.put("name", name);

params.put("age", String.valueOf(age));

HttpRequester.post(path, params, file);

}

（2）调用HttpRequester中的上传单个文件的post()方法：HttpRequester.post(path, params, file)。

加入访问网络和对SD卡读写的相关的权限：

- <!--

在SD Card中创建与删除文件权限

-->

<uses-permission android:name="android.permission.MOUNT_UNMOUNT_

FILESYSTEMS" />

- <!--

在SD Card中写入数据权限

-->

<uses-permission android:name="android.permission.WRITE_EXTERNAL_

STORAGE" />

27 Socket编程

27.3 Socket编程实战——Android聊天室实例

27.3.1 编写PC端工程代码

2．编写服务器端程序代码

1）编写Server.java

import java.awt.BorderLayout;

import javax.swing.*;

import java.awt.event.*;

public class Sever extends JFrame implements ActionListener

{ //服务器端主程序负责界面，以及服务段主线程ServerThread的启动

//服务端主线程ServerThread又产生BroadCast及ClientThread线程

//建立服务器端主界面中所用到的布局方式

BorderLayout borderLayout1 = new BorderLayout();

BorderLayout borderLayout2 = new BorderLayout();

JPanel jPanel1 = new JPanel(); //创建面板

JPanel jPanel2 = new JPanel();

JButton jButton1 = new JButton(); //创建按钮

JButton jButton2 = new JButton();

JScrollPane jScrollPane1 = new JScrollPane();

//创建服务器端接收信息文本框

static JTextArea jTextArea1 = new JTextArea();

boolean bool = false, start = false;

//声明ServerThread线程类对象

ServerThread serverThread;

Thread thread;

//构造函数，用于初始化

public Sever()

{

super("Server");

//设置内容面板布局方式

getContentPane().setLayout(borderLayout1);

//初始化按钮组件

jButton1.setText("启动服务器");

jButton1.addActionListener(this);

jButton2.setText("关闭服务器");

jButton2.addActionListener(this);

//初始化jPanel1面板对象，并向其中加入组件

this.getContentPane().add(jPanel1, java.awt.BorderLayout.NORTH);

jPanel1.add(jButton1);

jPanel1.add(jButton2);

//初始化jPanel2面板对象，并向其中加入组件

jTextArea1.setText("");

jPanel2.setLayout(borderLayout2);

jPanel2.add(jScrollPane1, java.awt.BorderLayout.CENTER);

jScrollPane1.getViewport().add(jTextArea1);

this.getContentPane().add(jPanel2, java.awt.BorderLayout.CENTER);

this.setSize(400, 400);

this.setVisible(true);

}

public static void main(String[] args)

{

Sever sever = new Sever();

sever.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

//服务器界面中按钮事件处理

public void actionPerformed(ActionEvent e)

{

if(e.getSource() == jButton1)

{

serverThread = new ServerThread();

serverThread.start();

}else if(e.getSource() == jButton2){

bool = false;

start = false;

serverThread.finalize();

this.setVisible(false);

}

2）编写ServerThread.java

import java.net.*;

import java.util.*;

import java.io.*;

public class ServerThread extends Thread

//服务器监听端口线程

{

//声明ServerSocket类对象

ServerSocket serverSocket;

//指定服务器监听端口常量

public static final int PORT = 8521;

//创建一个Vector对象，用于存储客户端连接的ClientThread对象

//ClientThread类维持服务器与单个客户端的连接线程

//负责接收客户端发来的信息

Vector<ClientThread> clients;

//创建一个Vector对象，用于存储客户端发送过来的信息

Vector<Object> messages;

//声明BroadCast类对象

//BroadCast类负责服务器向客户端广播消息

BroadCast broadcast;

String ip;

InetAddress myIPaddress=null;

public ServerThread()

{

//创建两个Vector数组非常重要

//clients负责存储所有与服务器建立连接的客户端

//messages负责存储服务器接收到的未发送出去的全部客户端的信息

clients=new Vector<ClientThread>();

messages=new Vector<Object>();

try

{

//创建ServerSocket类对象

serverSocket = new ServerSocket(PORT);

}

catch(IOException E){}

//获取本地服务器地址信息

try {

myIPaddress=InetAddress.getLocalHost();

}catch (UnknownHostException e){System.out.println(e.

toString());}

ip = myIPaddress.getHostAddress();

Sever.jTextArea1.append("服务器地址："+ ip +

"端口号:"+String.valueOf(serverSocket.getLocalPort())+"

\n");

//创建广播信息线程并启动

broadcast = new BroadCast(this);

broadcast.start();

}

//注意：一旦监听到有新的客户端创建即new Socket(ip, PORT)被执行,

//就创建一个ClientThread来维持服务器与这个客户端的连接

public void run()

{

while(true)

{

try

{

//获取客户端连接，并返回一个新的Socket对象

Socket socket = serverSocket.accept();

System.out.println(socket.getInetAddress().getHostAddress());

//创建ClientThread线程并启动

//启动ClientTread之后，可以监听该连接对应的客户端是否发送来消息，

//并获取消息

ClientThread clientThread=new ClientThread(socket,this);

clientThread.start();

if(socket!=null)

{

synchronized (clients)

{

//将客户端连接加入到Vector数组中保存

clients.addElement(clientThread);

}

catch(IOException E)

{

System.out.println("发生异常："+E);

System.out.println("建立客户端联机失败！");

System.exit(2);

}

public void finalize()

{

try

{ //关闭serverSocket方法

serverSocket.close();

}

catch(IOException E){}

serverSocket=null;

}

3）编写ClientThread.java

import java.net.*;

import java.io.*;

public class ClientThread extends Thread

{

//维持服务器与单个客户端的连接线程，负责接收客户端发来的信息

//声明一个新的Socket对象，

//用于保存服务器端用accept方法得到的客户端的连接

Socket clientSocket;

//声明服务器端中存储的Socket对象的数据输入／输出流

DataInputStream in = null;

DataOutputStream out = null;

//声明ServerThread对象

ServerThread serverThread;

// String str;

// public static int ConnectNumber=0;

public ClientThread(Socket socket,ServerThread serverThread)

{

clientSocket=socket;

this.serverThread=serverThread;

try

{

//创建服务器端数据输入／输出流

in = new DataInputStream(clientSocket.getInputStream());

out = new DataOutputStream(clientSocket.getOutputStream());

}

catch (IOException e2)

{

System.out.println("发生异常"+e2);

System.out.println("建立I/O通道失败！");

System.exit(3);

}

//该方法监听该连接对应得客户端是否有消息发送

public void run()

{

while(true)

{

try

{

//读入客户端发送来的信息

String message=in.readUTF();

synchronized(serverThread.messages)

{

if(message!=null)

{

//将客户端发送来得信息存于serverThread的messages数组中

serverThread.messages.addElement(message);

//在服务器端的文本框中显示新消息

Sever.jTextArea1.append(message+'\n');

}

catch(IOException E){break;}

}

4）编写BroadCast.java

import java.io.*;

public class BroadCast extends Thread

{ //服务器向客户端广播线程

//声明ClientThread对象

ClientThread clientThread;

//声明ServerThread对象

ServerThread serverThread;

String str;

public BroadCast(ServerThread serverThread)

{

this.serverThread = serverThread;

}

//该方法的作用是不停地向所有客户端发送新消息

public void run()

{

while(true)

{

try

{

//线程休眠200 ms

Thread.sleep(200);

}

catch(InterruptedException E){}

//同步化serverThread.messages

synchronized(serverThread.messages)

{

//判断是否有未发的消息

if(serverThread.messages.isEmpty()){

continue;

}

//获取服务器端存储的需要发送的第一条数据信息

str = (String)this.serverThread.messages.firstElement();

}

//同步化serverThread.clients

synchronized(serverThread.clients)

{

//利用循环获取服务器中存储的所有建立的与客户端的连接

for(int i=0;i<serverThread.clients.size();i++)

{

clientThread=(ClientThread)serverThread.clients.

elementAt(i);

try

{

//向记录的每一个客户端发送数据信息

clientThread.out.writeUTF(str);

}

catch(IOException E){}

}

//从Vector数组中删除已经发送过的那条数据信息

this.serverThread.messages.removeElement(str);

}

3．编写PC客户端程序代码

PC客户端包括一个类，Client.java。Client.java的代码如下：

import javax.swing.*;

import java.awt.*;

import java.net.*;

import java.sql.Date;

import java.text.SimpleDateFormat;

import java.io.*;

import java.awt.event.*;

public class Client extends JFrame implements Runnable,ActionListener

{ //客户端程序

private static final long serialVersionUID = 1L;

//创建Socket通信端口号常量

public static final int PORT = 8521;

…

Swing代码生成界面省略

…

//声明套接字对象

Socket socket;

//声明线程对象

Thread thread;

//声明客户器端数据输入／输出流

DataInputStream in;

DataOutputStream out;

//是否登录的标记

boolean flag=false;

//声明字符串，name存储用户名，chat_txt存储发言信息，chat_in存储从服务器接收到

的信息

String name,chat_txt,chat_in;

String ip=null;

//构造方法，生成客户端界面

public Client()

{

…

Swing代码生成界面省略

…

}

public static void main(String[] args)

{

Client client = new Client();

client.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

//客户端线程启动后的动作

public void run()

{

//循环执行，作用是一直监听服务器端是否有消息

while(true)

{

try

{

//读取服务器发送来的数据信息

chat_in = in.readUTF();

//将消息并显示在客户端的对话窗口中

jTextArea1.append(chat_in+"\n\n");

}

catch(IOException e){}

}

//界面按钮的事件处理机制

public void actionPerformed(ActionEvent e)

{

//"进入聊天室"按钮的处理

if(e.getSource() == loginJButton)

{

//获取用户名

name=jTextField1.getText();

//获取服务器ip

ip=jTextField3.getText();

//判断用户名是否有效及ip是否为空

if(name!="用户名输入"&&ip!=null)

{

try

{

//创建Socket对象

socket = new Socket(ip, PORT);

//创建客户端数据输入／输出流，用于对服务器端发送或接收数据

in = new DataInputStream(socket.getInputStream());

out = new DataOutputStream(socket.getOutputStream());

Date now = new Date(System.currentTimeMillis());

SimpleDateFormat format = new SimpleDateFormat("hh:mm:

ss");

String nowStr = format.format(now);

out.writeUTF("$$"+name +" "+ nowStr + " 上线了！");

} catch (IOException e1) {System.out.println("can not

connect");}

thread = new Thread(this);

//开启线程，监听服务器端是否有消息

thread.start();

//说明已经登录成功

flag = true;

}

//"发送"按钮的处理

else if(e.getSource() == sendMessageJButton)

{

//获取客户端输入的发言内容

chat_txt=jTextField2.getText();

if(chat_txt!=null)

{

Date now = new Date(System.currentTimeMillis());

SimpleDateFormat format = new SimpleDateFormat("hh:mm:ss");

String nowStr = format.format(now);

//发言，向服务器发送发言的信息

try{out.writeUTF("^_^" +jTextField1.getText()+ " " +

nowStr + " 说\n"+chat_txt);}

catch(IOException e2){}

}

else

{

try{out.writeUTF("请说话");}

catch(IOException e3){}

}

//"退出聊天室"按钮事件的处理

else if(e.getSource() == leaveJButton)

{

if(flag==true)

{

try

{

out.writeUTF("##"+ name +"下线了！");

//关闭socket

out.close();

in.close();

socket.close();

} catch (IOException e4) {}

}

flag=false;

this.setVisible(false);

}

27.3.2 编写手机客户端工程代码

2．编写strings.xml

<?xml version="1.0" encoding="utf-8"?>

<string name="hello">Hello World, ChatClientActivity!</string>

<string name="app_name">聊天室Android客户端</string>

<string name="ip">服务器IP:</string>

</resources>

3．编写main.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/

android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

<TextView

android:text="@string/username"

android:layout_width="70px"

android:layout_height="40px"

android:id="@+id/usernameText"/>

<EditText

android:text=" "

android:layout_width="180px"

android:layout_height="40px"

android:maxLength="10"

android:layout_toRightOf="@id/usernameText"

android:id="@+id/username" >

</EditText>

<Button

android:layout_width="wrap_content"

android:layout_height="40px"

android:text="@string/login"

android:layout_toRightOf="@id/username"

android:id="@+id/LoginButton"/>

<TextView

android:text="@string/ip"

android:layout_width="70px"

android:layout_height="40px"

android:layout_below="@id/username"

android:layout_alignParentLeft="true"

android:id="@+id/ipText"/>

<EditText

android:text="192.168.1.188"

android:layout_width="180px"

android:layout_height="40px"

android:layout_toRightOf="@id/ipText"

android:layout_alignTop="@id/ipText"

android:digits=".1234567890"

android:id="@+id/ip" >

</EditText>

<Button

android:layout_width="wrap_content"

android:layout_height="40px"

android:text="@string/leave"

android:layout_toRightOf="@id/ip"

android:layout_alignTop="@id/ip"

android:id="@+id/LeaveButton"/>

<EditText

android:layout_width="fill_parent"

android:layout_height="280px"

android:layout_below="@id/ipText"

android:editable="false"

android:gravity="top"

android:id="@+id/history" >

</EditText>

<EditText

android:layout_width="280px"

android:layout_height="240px"

android:layout_below="@id/history"

android:gravity="top"

android:id="@+id/message" >

</EditText>

<Button

android:layout_width="wrap_content"

android:layout_height="240px"

android:text="@string/send"

android:layout_toRightOf="@id/message"

android:layout_alignTop="@id/message"

android:id="@+id/SendButton"/>

</RelativeLayout>

4．编写功能清单文件，添加网络访问权限

编写AndroidManifest.xml：

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.sharpandroid.chatclient"

android:versionCode="1"

android:versionName="1.0">

<application android:icon="@drawable/icon" android:label="@string/

app_name">

<activity android:name=".ChatClientActivity"

android:label="@string/app_name">

<intent-filter>

<category android:name="android.intent.category.LAUNCHER"

</intent-filter>

</activity>

</application>

<uses-sdk android:minSdkVersion="7" />

<uses-permission android:name="android.permission.INTERNET"></uses-

permission>

</manifest>

5．编写ChatClientActivity.java

package com.sharpandroid.chatclient;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.IOException;

import java.net.InetAddress;

import java.net.Socket;

import java.sql.Date;

import java.text.SimpleDateFormat;

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

public class ChatClientActivity extends Activity implements Runnable{

private EditText usernameEdit;

private EditText ipEdit;

private EditText historyEdit;

private EditText messageEdit;

private Button loginButton;

private Button sendButton;

private Button leaveButton;

//声明字符串，name存储用户名

//chat_txt存储发言信息

//chat_in存储从服务器接收到的信息

private String username,ip,chat_txt,chat_in;

//创建Socket通信端口号常量

public static final int PORT = 8521;

//声明套接字对象

Socket socket;

//声明线程对象

Thread thread;

//声明客户器端数据输入输出流

DataInputStream in;

DataOutputStream out;

//是否登录的标记

boolean flag=false;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

//获取main.xml文件中定义的一系列组件

usernameEdit = (EditText) findViewById(R.id.username);

ipEdit = (EditText) findViewById(R.id.ip);

historyEdit = (EditText) findViewById(R.id.history);

messageEdit = (EditText) findViewById(R.id.message);

loginButton = (Button) findViewById(R.id.LoginButton);

sendButton = (Button) findViewById(R.id.SendButton);

leaveButton = (Button) findViewById(R.id.LeaveButton);

//为三个按钮注册监听器

loginButton.setOnClickListener(listener);

sendButton.setOnClickListener(listener);

leaveButton.setOnClickListener(listener);

}

View.OnClickListener listener = new View.OnClickListener() {

@Override

public void onClick(View v) {

switch (v.getId()) {

//"进入聊天室"按钮的处理

case R.id.LoginButton:

if(flag == true){

Toast.makeText(ChatClientActivity.this,"已经登陆过

了!", Toast.LENGTH_SHORT).show();

return;

}

//获取用户名

username = usernameEdit.getText().toString();

//获取服务器ip

ip = ipEdit.getText().toString();

//判断用户名是否有效及ip是否为空

if(username != "" && username!=null

&& username!="用户名输入" && ip!=null){

try

{

//创建Socket对象

socket = new Socket(ip, PORT);

//创建客户端数据输入／输出流，用于对服务器端发送或接收数据

in = new DataInputStream(socket.getInputStream());

out = new DataOutputStream(socket.getOutputStream());

Date now = new Date(System.currentTimeMillis());

SimpleDateFormat format = new SimpleDateFormat("

hh:mm:ss");

String nowStr = format.format(now);

out.writeUTF("$$" + username +" "+ nowStr + " 上

线了！");

} catch (IOException e1) {System.out.println("can not

connect");}

thread = new Thread(ChatClientActivity.this);

//开启线程，监听服务器段是否有消息

thread.start();

//说明已经登录成功

flag = true;

}

break;

//"发送"按钮的处理

case R.id.SendButton:

if(flag ==false){

Toast.makeText(ChatClientActivity.this, "没有登录，

请登录！",Toast.LENGTH_SHORT).show();

return;

}

//获取客户端输入的发言内容

chat_txt = messageEdit.getText().toString();

if(chat_txt != null)

{

Date now = new Date(System.currentTimeMillis());

SimpleDateFormat format = new SimpleDateFormat("hh:mm:

ss");

String nowStr = format.format(now);

//发言，向服务器发送发言的信息

try{out.writeUTF("^_^" + username+ " " + nowStr + "

说\n" + chat_txt);}

catch(IOException e2){}

}

else

{

try{out.writeUTF("请说话");}

catch(IOException e3){}

}

break;

//"退出聊天室"按钮事件的处理

case R.id.LeaveButton:

if(flag==true)

{

if(flag ==false){

Toast.makeText(ChatClientActivity.this, "没有

return;

}

try {

out.writeUTF("=="+username+"下线了！");

//关闭socket

out.close();

in.close();

socket.close();

} catch (IOException e4) {}

}

flag=false;

Toast.makeText(ChatClientActivity.this, "已退出！",

Toast.LENGTH_SHORT).show();

break;

}

};

//客户端线程启动后的动作

@Override

public void run() {

//循环执行，作用是一直监听服务器端是否有消息

while(true)

{

try

{

//读取服务器发送来的数据信息

chat_in = in.readUTF();

chat_in = chat_in + "\n";

//发送一个消息，要求刷新界面

mHandler.sendMessage(mHandler.obtainMessage());

}

catch(IOException e){}

}

Handler mHandler = new Handler()

{

public void handleMessage(Message msg)

{

//将消息并显示在客户端的对话窗口中

historyEdit.append(chat_in);

// 刷新

super.handleMessage(msg);

}

};

}

28 WebView的介绍及应用

28.2 WebView浏览网页简单示例

编写strings.xml：

<?xml version="1.0" encoding="utf-8"?>

<string name="hello">请输入网址：</string>

<string name="app_name">WebView简单示例</string>

<string name="button">LoadUrl</string>

<string name="button1">LoadData</string>

</resources>

编写main.xml文件：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/hello"/>

<EditText

android:id="@+id/path"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="http://www.baidu.com"/>

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/button"

android:id="@+id/button"/>

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/button1"

android:id="@+id/button1"/>

<WebView

android:layout_height="fill_parent"

android:layout_width="fill_parent"

android:id="@+id/webview"/>

</LinearLayout>

编写WebViewActivity1.java：

package com.sharpandroid.webviewdemo1;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.webkit.WebView;

import android.widget.Button;

import android.widget.EditText;

public class WebViewActivity1 extends Activity {

private WebView webView;

private EditText pathEdit;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

webView = (WebView) findViewById(R.id.webview);

Button Button = (Button) findViewById(R.id.button);

//为第一个button添加单击事件

button.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

//获取文本框里的内容

pathEdit = (EditText) findViewById(R.id.path);

String path = pathEdit.getText().toString();

//在WebView中加载指定的路径，路径以“http://”开头

webView.loadUrl(path);

}

});

Button button1 = (Button) findViewById(R.id.button1);

//为第二个Button添加单击事件

button1.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

pathEdit = (EditText) findViewById(R.id.path);

//定义一个字符串，内容包含一个超链接，指向百度

String data = "<a href='http://www.baidu.com'>baidu</a>" ;

//在WebView中加载该数据，数据类型是“text/html”，编码格式是“utf-8”

webView.loadData(data,"text/html" ,"utf -8");

}

});

}

为程序添加网络访问权限。编写功能清单文件，内容如下：

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.sharpandroid.webviewdemo1"

android:versionCode="1"

android:versionName="1.0">

<application android:icon="@drawable/icon" android:label="@string/

app_name">

<activity android:name=".WebViewActivity1"

android:label="@string/app_name">

<intent-filter>

<category android:name="android.intent.category.LAUNCHER"

</intent-filter>

</activity>

</application>

<uses-sdk android:minSdkVersion="7" />

<uses-permission android:name="android.permission.INTERNET" />

</manifest>

28.3 WebView浏览网页复杂示例

准备一个名为index.html的HTML文件，放置到工程的“/assets”目录下。文件中包含三种不同的弹出对话框，供WebChromeClient测试使用，内容如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "

http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

gb2312" />

<title>测试JavaScript的三种不同对话框</title>

function alertFun()

{

alert("Alert警告对话框！-你好吗？");

}

function confirmFun()

{

if(confirm("访问搜狐？"))

{

location.href="http://www.sohu.com";

}

else

{

alert("取消访问！");

}

function promptFun()

{

var word =prompt("Prompt对话框","请输入你最想说的一句话：");

if(word)

{

alert("你说："+ word)

}else{

alert("呵呵，你沉默了！");

}

</script>

</head>

<body>

<p>三种对话框示例</p>

<p>Alert对话框-你好啊！</p>

<p>

<input type="submit" name="Submit" value="按钮1" onclick="

alertFun()" />

</p>

<p>Confirm对话框-是否访问搜狐！</p>

<p>

<input type="submit" name="Submit2" value="按钮2" onclick=

"confirmFun()" />

</p>

<p>Prompt对话框-告诉我你想说的话！</p>

<p>

<input type="submit" name="Submit3" value="按钮3" onclick=

"promptFun()" />

</p>

</body>

</html>

编写strings.xml文件：

<?xml version="1.0" encoding="utf-8"?>

<string name="app_name">WebView示例2</string>

<string name="hello">请输入网址：</string>

<string name="button">LoadUrl</string>

</resources>

编写main.xml文件：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/hello"/>

<EditText

android:id="@+id/path"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="file:///android_asset/index.html"/>

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/button"

android:id="@+id/button"/>

<WebView

android:layout_height="fill_parent"

android:layout_width="fill_parent"

android:id="@+id/webview"/>

</LinearLayout>

编写prompt_view.xml文件：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:gravity="center_horizontal"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

<TextView

android:id="@+id/text"

android:layout_width="fill_parent"

android:layout_height="wrap_content"/>

<EditText

android:id="@+id/edit"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:selectAllOnFocus="true"

android:scrollHorizontally="true"/>

</LinearLayout>

编写WebViewActivity2.java：

package com.sharpandroid.webviewdemo2;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.AlertDialog.Builder;

import android.content.DialogInterface;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.webkit.JsPromptResult;

import android.webkit.JsResult;

import android.webkit.WebChromeClient;

import android.webkit.WebSettings;

import android.webkit.WebView;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class WebViewActivity2 extends Activity {

private Button mButton;

private EditText mEditText;

private WebView mWebView;

@Override

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

mButton = (Button) findViewById(R.id.button);

mEditText = (EditText) findViewById(R.id.path);

mWebView = (WebView) findViewById(R.id.webview);

//获取WebSettings对象

WebSettings webSettings = mWebView.getSettings();

//设置支持JavaScript脚本

webSettings.setJavaScriptEnabled(true);

//设置可以访问文件

webSettings.setAllowFileAccess(true);

//设置支持缩放

webSettings.setBuiltInZoomControls(true);

//设置WebChromeClient,对网页中 JavaScript代码的各种事件进行处理

mWebView.setWebChromeClient(new MyWebChromeClient());

//按钮单击事件监听

mButton.setOnClickListener(new OnClickListener()

{

public void onClick(View v)

{

//取得编辑框中我们输入的内容

String url = mEditText.getText().toString();

mWebView.loadUrl(url);

}

});

}

class MyWebChromeClient extends WebChromeClient {

@Override

// 处理javascript中的alert

public boolean onJsAlert(WebView view, String url, String message,

final JsResult result) {

// 构建一个Builder来显示网页中的对话框

new Builder(WebViewActivity2.this).setTitle("Alert对话框")

.setMessage(message)

// android.R.string.ok来自系统自带的文本，内容为“确定”

.setPositiveButton(android.R.string.ok,

new AlertDialog.OnClickListener() {

public void onClick(DialogInterface dialog,int which) {

// 单击确定按钮之后,继续执行网页中的操作

result.confirm();

}

})

.setCancelable(false).show();

return true;

};

@Override

// 处理javascript中的confirm

public boolean onJsConfirm(WebView view, String url, String

message,

final JsResult result) {

new Builder(WebViewActivity2.this)

.setTitle("Confirm对话框")

.setMessage(message)

.setPositiveButton(android.R.string.ok,

new AlertDialog.OnClickListener() {

public void onClick(DialogInterface dialog,int which) {

result.confirm();

}

})

// android.R.string.ok来自系统自带的文本，内容为“取消”

.setNegativeButton(android.R.string.cancel,

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int

which) {

result.cancel();

}

})

.setCancelable(false)

.show();

return true;

};

@Override

// 处理javascript中的prompt

// message为网页中对话框的提示内容

// defaultValue在没有输入时，默认显示的内容

public boolean onJsPrompt(WebView view, String url, String message,

String defaultValue, final JsPromptResult result) {

//获得一个LayoutInflater对象factory，该对象可以将指定的xml布局文

件生成相应的对象

final LayoutInflater factory = LayoutInflater.from

(WebViewActivity2.this);

// 获取自定义的带输入框的对话框由TextView和EditText构成

final View dialogView = factory.inflate(R.layout.prompt_view,

null);

// 设置TextView对应网页中的提示信息

((TextView) dialogView.findViewById(R.id.text))

.setText(message);

//为dialogView上的edit输入框设置来自网页的默认文字

((EditText) dialogView.findViewById(R.id.edit))

.setText(defaultValue);

new Builder(WebViewActivity2.this)

.setTitle("Prompt对话框")

//将前面获取的diaoView这个视图文件添加到对话框上面

.setView(dialogView)

.setPositiveButton(android.R.string.ok,

new AlertDialog.OnClickListener() {

public void onClick(DialogInterface dialog,int which){

// 单击确定之后，取得输入的值，传给网页处理

String value = ((EditText) dialogView.findViewById

(R.id.edit)).getText().toString();

result.confirm(value);

}

})

.setNegativeButton(android.R.string.cancel,

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog,intwhich){

result.cancel();

}

})

.show();

return true;

};

}

由于在工程中需要访问Internet，因此，添加访问网络权限，编写功能清单文件：

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.sharpandroid.webviewdemo2"

android:versionCode="1"

android:versionName="1.0">

<application android:icon="@drawable/icon" android:label="@string/

app_name">

<activity android:name=".WebViewActivity2"

android:label="@string/app_name">

<intent-filter>

<category android:name="android.intent.category.LAUNCHER"

</intent-filter>

</activity>

</application>

<uses-sdk android:minSdkVersion="7" />

<uses-permission android:name="android.permission.INTERNET"></uses-

permission>

</manifest>

28.4 WebView使用HTML替代Layout做界面

2．编写网页文件

在assets目录下新建一个HTML文件phoneui.html，内容如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "

http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>Insert title here</title>

//该部分用到了JavaScript的一些知识，不熟练的读者可以查阅相关书籍

//或者可由美工做出来之后，进行必要的修改

function show(jsondata){

//将传递过来的json数据转换为对象

var jsonobjs = eval(jsondata);

//获取下面定义的的表格

var table = document.getElementById("personTable");

//遍历上面创建的json对象，将每个对象添加为表格中的一行，其每个属性为一列

for(var i=0; i<jsonobjs.length; i++){

//添加一行

var tr = table.insertRow(table.rows.length);

//添加三个单元格

var td1 = tr.insertCell(0);

var td2 = tr.insertCell(1);

td2.align = "center";

var td3 = tr.insertCell(2);

//设置单元格的内容和属性，

//其中innerHTML为设置或获取位于对象起始和结束标签内的 HTML

//jsonobjs[i]为对象数组中的第i个对象

td1.innerHTML = jsonobjs[i].id;

td2.innerHTML = jsonobjs[i].name

//为显示的内容添加超链接。

//超链接会调用Java代码中的call()方法并且把内容作为参数传递过去

td3.innerHTML = "<a href='javascript:sharp.call(\""+

jsonobjs[i].phone +"\")'>"+jsonobjs[i].phone+ "</a>"; ;

}

</script>

</head>

<!--onload指定了当该页面被加载时调用的方法，本例调用了Java代码中的contactlist方

法--><body bgcolor="#000000" text="#FFFFFF" style="margin:0000"

onload="javascript:sharp.contactlist()">

<table border="0" width="100%" id="personTable" cellspacing="0"

<tr>

<td width="15%">编号</td><td align="center">姓名</td><td

width="15%">电话</td>

</tr>

</table>

</body>

</html>

3．编写main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

<WebView

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:id="@+id/webView"

</LinearLayout>

4．编写Contact.java

其代码如下：

package com.sharpandroid.domain;

public class Contact {

private Integer id;

private String name;

private String phone;

public Integer getId() {

return id;

}

public void setId(Integer id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getPhone() {

return phone;

}

public void setPhone(String phone) {

this.phone = phone;

}

public Contact(Integer id, String name, String phone) {

this.id = id;

this.name = name;

this.phone = phone;

}

public Contact(){}

}

5．编写HtmlActivity.Java

HtmlActivity.java

package com.sharpandroid.html;

import java.util.ArrayList;

import java.util.List;

import org.json.JSONArray;

import org.json.JSONObject;

import android.app.Activity;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.webkit.WebView;

import com.sharpandroid.domain.Contact;

public class HtmlActivity extends Activity {

private WebView webView;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

webView = (WebView)this.findViewById(R.id.webView);//浏览器

webView.getSettings().setJavaScriptEnabled(true);//支持js

webView.getSettings().setSaveFormData(false);//不保存表单

webView.getSettings().setSavePassword(false);//不保存密码

webView.getSettings().setSupportZoom(false);//不支持放大功能

webView.addJavascriptInterface(new SharpJavaScript(), "sharp");

//addJavascriptInterface方法中要绑定的Java对象

webView.loadUrl("file:///android_asset/index.html");

}

public class SharpJavaScript{

public void contactlist(){

try {

String json = buildJson(getContacts());

webView.loadUrl("javascript:show('"+ json + "')");//调

用js的show()方法

} catch (Exception e) {

e.printStackTrace();

}

public void call(String phone){

Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:"+

phone));

HtmlActivity.this.startActivity(intent);

}

//模拟从数据库或者从网络获取数据

public List<Contact> getContacts(){

List<Contact> contacts = new ArrayList<Contact>();

contacts.add(new Contact(1, "张三", "5554"));

contacts.add(new Contact(2, "李四", "5556"));

contacts.add(new Contact(3, "王五", "5557"));

return contacts;

}

public String buildJson(List<Contact> contacts) throws Exception{

JSONArray array = new JSONArray();

for(Contact contact : contacts){

JSONObject jsonObject = new JSONObject();

jsonObject.put("id", contact.getId());

jsonObject.put("name", contact.getName());

jsonObject.put("phone", contact.getPhone());

array.put(jsonObject);

}

return array.toString();

}

6．添加拨号权限

功能清单文件如下：

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.sharpandroid.phoneuibyhtml"

android:versionCode="1"

android:versionName="1.0">

<application android:icon="@drawable/icon" android:label="@string/

app_name">

<activity android:name=".PhoneActivity"

android:label="@string/app_name">

<intent-filter>

</intent-filter>

</activity>

</application>

<uses-sdk android:minSdkVersion="7" />

<uses-permission android:name="android.permission.CALL_PHONE"/>

</manifest>

大话企业级Android应用开发实战 文件下载

25 Android文件下载

25.1 Android文件单线程下载

25.2 Android文件多线程下载

26 Android文件上传

26.1 Android客户端上传初体验

26.2 Android客户端实现请求参数数据上传

26.3 Android客户端实现文件上传

27 Socket编程

27.3 Socket编程实战——Android聊天室实例

28 WebView的介绍及应用

28.2 WebView浏览网页简单示例

28.3 WebView浏览网页复杂示例

28.4 WebView使用HTML替代Layout做界面

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大话企业级Android应用开发实战文件下载