先说服务器端,需要包含commons-fileupload.jar和commons-io.jar这俩jar包,注意要导入到WEB-INF/lib目录下面,否则导入不正确要吃很多亏
再看代码
package com.apptest;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class FileUpload extends HttpServlet {
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
//获得磁盘文件条目工厂。
DiskFileItemFactory factory = new DiskFileItemFactory();
//获取文件上传需要保存的路径,upload文件夹需存在。
String path = request.getSession().getServletContext().getRealPath("/upload");
//设置暂时存放文件的存储室,这个存储室可以和最终存储文件的文件夹不同。因为当文件很大的话会占用过多内存所以设置存储室。
factory.setRepository(new File(path));
//设置缓存的大小,当上传文件的容量超过缓存时,就放到暂时存储室。
factory.setSizeThreshold(1024*1024);
//上传处理工具类(高水平API上传处理?)
ServletFileUpload upload = new ServletFileUpload(factory);
try{
//调用 parseRequest(request)方法 获得上传文件 FileItem 的集合list 可实现多文件上传。
List list = (List)upload.parseRequest(request);
for(FileItem item:list){
//获取表单属性名字。
String name = item.getFieldName();
//如果获取的表单信息是普通的文本信息。即通过页面表单形式传递来的字符串。
if(item.isFormField()){
//获取用户具体输入的字符串,
String value = item.getString();
request.setAttribute(name, value);
}
//如果传入的是非简单字符串,而是图片,音频,视频等二进制文件。
else{
//获取路径名
String value = item.getName();
//取到最后一个反斜杠。
int start = value.lastIndexOf("\\");
//截取上传文件的 字符串名字。+1是去掉反斜杠。
String filename = value.substring(start+1);
request.setAttribute(name, filename);
/*第三方提供的方法直接写到文件中。
* item.write(new File(path,filename));*/
//收到写到接收的文件中。
OutputStream out = new FileOutputStream(new File(path,filename));
InputStream in = item.getInputStream();
int length = 0;
byte[] buf = new byte[1024];
System.out.println("获取文件总量的容量:"+ item.getSize());
while((length = in.read(buf))!=-1){
out.write(buf,0,length);
}
in.close();
out.close();
}
}
}catch(Exception e){
e.printStackTrace();
}
}
}
然后是客服端程序
MainActivity
package com.example.androidtest;
import java.io.File;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.ContentResolver;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener{
private static String requestURL = "http://172.19.76.105/Secret/com/FileUpload";
private Button selectImage, uploadImage;
private ImageView imageView;
private String picPath = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
selectImage = (Button) this.findViewById(R.id.selectImage);
uploadImage = (Button) this.findViewById(R.id.uploadImage);
selectImage.setOnClickListener(this);
uploadImage.setOnClickListener(this);
imageView = (ImageView) this.findViewById(R.id.imageView);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.selectImage:
/***
* 这个是调用android内置的intent,来过滤图片文件 ,同时也可以过滤其他的
*/
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent, 1);
break;
case R.id.uploadImage:
if (picPath == null) {
Toast.makeText(MainActivity.this, "请选择图片!", 1000).show();
} else {
final File file = new File(picPath);
if (file != null) {
new Thread(new Runnable(){
@Override
public void run() {
int request = UploadUtil.uploadFile(file, requestURL);
System.out.println("upload");
//uploadImage.setText(request+"");
}
}).start();
}
}
break;
default:
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == Activity.RESULT_OK) {
/**
* 当选择的图片不为空的话,在获取到图片的途径
*/
Uri uri = data.getData();
//Log.e(TAG, "uri = " + uri);
try {
String[] pojo = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, pojo, null, null, null);
if (cursor != null) {
ContentResolver cr = this.getContentResolver();
int colunm_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
String path = cursor.getString(colunm_index);
/***
* 这里加这样一个判断主要是为了第三方的软件选择,比如:使用第三方的文件管理器的话,你选择的文件就不一定是图片了,
* 这样的话,我们判断文件的后缀名 如果是图片格式的话,那么才可以
*/
if (path.endsWith("jpg") || path.endsWith("png")) {
picPath = path;
Bitmap bitmap = BitmapFactory.decodeStream(cr
.openInputStream(uri));
imageView.setImageBitmap(bitmap);
} else {
alert();
}
} else {
alert();
}
} catch (Exception e) {
}
}
super.onActivityResult(requestCode, resultCode, data);
}
private void alert() {
Dialog dialog = new AlertDialog.Builder(this).setTitle("提示")
.setMessage("您选择的不是有效的图片")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
picPath = null;
}
}).create();
dialog.show();
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode == KeyEvent.KEYCODE_BACK){
GGView.enable=false;
System.exit(0);
}
return true;
}
}
UploadUtil
package com.example.androidtest;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.UUID;
import android.util.Log;
public class UploadUtil {
private static final String TAG = "uploadFile";
private static final int TIME_OUT = 10 * 1000; // 超时时间
private static final String CHARSET = "utf-8"; // 设置编码
/**
* 上传文件到服务器
* @param file 需要上传的文件
* @param RequestURL 请求的rul
* @return 返回响应的内容
*/
public static int uploadFile(File file, String RequestURL) {
int res=0;
String result = null;
String BOUNDARY = UUID.randomUUID().toString(); // 边界标识 随机生成
String PREFIX = "--", LINE_END = "\r\n";
String CONTENT_TYPE = "multipart/form-data"; // 内容类型
try {
URL url = new URL(RequestURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(TIME_OUT);
conn.setConnectTimeout(TIME_OUT);
conn.setDoInput(true); // 允许输入流
conn.setDoOutput(true); // 允许输出流
conn.setUseCaches(false); // 不允许使用缓存
conn.setRequestMethod("POST"); // 请求方式
conn.setRequestProperty("Charset", CHARSET); // 设置编码
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary="+ BOUNDARY);
if (file != null) {
/**
* 当文件不为空时执行上传
*/
DataOutputStream dos = new DataOutputStream(conn.getOutputStream());
StringBuffer sb = new StringBuffer();
sb.append(PREFIX);
sb.append(BOUNDARY);
sb.append(LINE_END);
/**
* 这里重点注意: name里面的值为服务器端需要key 只有这个key 才可以得到对应的文件
* filename是文件的名字,包含后缀名
*/
sb.append("Content-Disposition: form-data; name=\"file\"; filename=\""
+ file.getName() + "\"" + LINE_END);
sb.append("Content-Type: application/octet-stream; charset="
+ CHARSET + LINE_END);
sb.append(LINE_END);
dos.write(sb.toString().getBytes());
InputStream is = new FileInputStream(file);
byte[] bytes = new byte[1024];
int len = 0;
while ((len = is.read(bytes)) != -1) {
dos.write(bytes, 0, len);
}
is.close();
dos.write(LINE_END.getBytes());
byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END)
.getBytes();
dos.write(end_data);
dos.flush();
/**
* 获取响应码 200=成功 当响应成功,获取响应的流
*/
res = conn.getResponseCode();
Log.e(TAG, "response code:" + res);
if (res == 200) {
Log.e(TAG, "request success");
InputStream input = conn.getInputStream();
StringBuffer sb1 = new StringBuffer();
int ss;
while ((ss = input.read()) != -1) {
sb1.append((char) ss);
}
result = sb1.toString();
Log.e(TAG, "result : " + result);
} else {
Log.e(TAG, "request error");
}
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return res;
}
}
activity_main.xml