Android接收jsp中动态生成的xml或json数据。
数据库：
Servlet端doPost（）方法：
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
// response.setContentType("text/xml;charset=utf-8");
String format = request.getParameter("format");// 获取url传过来的数据
ResultSet rs = userinfo.queryUserInfo("1=1");
XmlJsonInter xmlJson = new XmlJsonImpl();
if ("json".equals(format)) {
xmlJson.JSON(rs, request, response);
} else {
xmlJson.XML(rs, request, response);
// PrintWriter out=response.getWriter();
// out.write("ceshi");
}
}
JSON方法和XML方法的实现：
package net.palm_on_campus.dao.interImpl;
import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.jstl.core.Config;
import net.palm_on_campus.dao.inter.XmlJsonInter;
import net.palm_on_campus.dao.model.UserInfo;
/**
* <p>================MyEclipse===================
* <p>将数据库中查询得到的数据转换为xml或者json格式[接口的实现]
* <p>2013-7-22上午10:35:33
* <p>============================================
* @author YI
*/
public class XmlJsonImpl implements XmlJsonInter {
@Override
public void JSON(ResultSet rs, HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// json格式： [{id:56,title:"xxxx",timelength:90}]
StringBuilder builder = new StringBuilder();
builder.append('[');
try {
if (rs != null)
while (rs.next()) {
builder.append('{');
builder.append("username:")
.append(rs.getString("username")).append(',');
builder.append("userlogin:\"")
.append(rs.getString("userlogin")).append("\",");
builder.append("userpwd:\"")
.append(rs.getString("userpwd")).append("\",");
builder.append("flag:\"")
.append(rs.getString("flag")).append("\",");
builder.append("note:").append(rs.getString("note"));
builder.append("},");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
builder.deleteCharAt(builder.length() - 1);
builder.append(']');
request.setAttribute("json",builder.toString());
request.getRequestDispatcher("/json.jsp").forward(request, response);
}
@Override
public void XML(ResultSet rs, HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
List<UserInfo> users = new ArrayList<UserInfo>();
try {
while (rs.next()) {
UserInfo user = new UserInfo();
user.setUserName(rs.getString("username"));
user.setUserPwd(rs.getString("userpwd"));
user.setUserLogin(rs.getString("userlogin"));
user.setNote(rs.getString("note"));
user.setFlag(Integer.parseInt(rs.getString("flag")));
users.add(user);
}
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
request.setAttribute("users", users);
request.getRequestDispatcher("/xml.jsp").forward(request, response);
}
}
json.jsp,和xml.jsp的实现：
json.jsp:
<%@ page language="java" contentType="text/plain; charset=UTF-8" pageEncoding="UTF-8"%>${json}
xml.jsp
<?xml version="1.0" encoding="utf-8"?>
<!--上面这句话必须为第一句，否则pull解析器报错 -->
<%@ page language="java" contentType="text/xml; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<userinfo>
<c:forEach items="${users}" var="user">
<user>
<username>${user.userName}</username>
<userlogin>${user.userLogin}</userlogin>
<note>${user.note}</note>
<userpwd>${user.userPwd}</userpwd>
<flag>${user.flag}</flag>
</user>
</c:forEach>
</userinfo>
WEB端测试[test.jsp]：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="UserInfoServlet" method="post">
用户名：<input name="bookname" type="text"/>
<p/>
<input type="submit" value="查询"/>
</form>
</body>
</html>
测试结果数据显示为：
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
ANDROID端：
Tools工具类：[请根据需要改写，以下是解析json，和xml数据方法------仅供参考]
Tools.class:
package net.palm_on_campus.tools;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import net.palm_on_campus.model.Info;
import net.palm_on_campus.model.UserInfo;
import org.json.JSONArray;
import org.json.JSONObject;
import org.xmlpull.v1.XmlPullParser;
import android.util.Xml;
public class Tools {
public static byte[] read(InputStream inStream) throws Exception {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
while( (inStream.read(buffer)) !=-1){
outputStream.write(buffer);
}
inStream.close();
return outputStream.toByteArray();
}
/**
* ------------------------------
* <p>解析json数据
* @param is 输入流
* @return
* @throws Exception
* 2013-7-22
* @-----------------------------
*/
public static List<Info> parseJSON(InputStream is) throws Exception {
List<Info> arruser = new ArrayList<Info>();
byte[] data =Tools.read(is);
//将字节数组转换成字符串
String json= new String(data);
//将json对象转换成json的数组对象
JSONArray array = new JSONArray(json);
for (int i = 0; i < array.length(); i++) {
JSONObject jsonObject=array.getJSONObject(i);
Info userInfo=new UserInfo(jsonObject);
// userInfo.setUserName(jsonObject.getString("username"));
// userInfo.setUserLogin(jsonObject.getString("userlogin"));
// userInfo.setNote(jsonObject.getString("note"));
// userInfo.setFlag(Integer.parseInt(jsonObject.getString("flag")));
// userInfo.setUserPwd(jsonObject.getString("userpwd"));
arruser.add(userInfo);
}
return arruser;
}
/**
* ------------------------------
* <p>解析xml数据
* @param is
* @return
* @throws Exception
* 2013-7-22
* @-----------------------------
*/
public static List<Info> parseXML(InputStream is) throws Exception{
List<Info> users=null;
UserInfo user = null;
//用Pull解析器解析XML文件
XmlPullParser parser= Xml.newPullParser();
parser.setInput(is, "UTF-8");
int event = parser.getEventType();
//不等于结束事件，循环读取XML文件并封装成对象
while(event !=XmlPullParser.END_DOCUMENT){
switch (event) {
case XmlPullParser.START_DOCUMENT:
users= new ArrayList<Info>();
break;
case XmlPullParser.START_TAG:
if("username".equals(parser.getName())){
user.setUserName(parser.nextText());
}else if("userlogin".equals(parser.getName())){
user.setUserLogin(parser.nextText());
}else if("userpwd".equals(parser.getName())){
user.setUserPwd(parser.nextText());
}else if("note".equals(parser.getName())){
user.setNote(parser.nextText());
}else if("flag".equals(parser.getName())){
user.setFlag(Integer.parseInt(parser.nextText()));
}else if("user".equals(parser.getName())){
user=new UserInfo();
}
break;
case XmlPullParser.END_TAG:
if("user".equals(parser.getName())){
users.add(user);
user = null;
}
break;
}
event = parser.next();
}
return users;
}
}
以上涉及的Info.class和UserInfo.class
package net.palm_on_campus.model;
/**
* <p>=================Eclipse====================
* <p>这个类名义上是所有信息的父类，但并没有储存信息。只是为了实现多态，从而达到统一接口命名
* <p>之所以要统一命名是为了使得Tools类中parseJSON，parseXML等方法的通用性
* <p>但是又不能直接去定义接口，因为接口的实现要实现接口中所有方法，但是时间使用中不一定全部需要
* <p>2013-7-23下午12:46:35
* <p>============================================
* @author YI
*/
public abstract class Info {
//begin---------以下抽象方法为UserInfo实现的方法进行注册------------
public abstract int getFlag();
public abstract void setFlag(int flag);
public abstract String getUserLogin();
public abstract void setUserLogin(String userLogin);
public abstract String getUserName();
public abstract void setUserName(String userName);
public abstract String getUserPwd();
public abstract void setUserPwd(String userPwd);
public abstract String getNote();
public abstract void setNote(String note);
//end-------------------------------------------------------------
}
package net.palm_on_campus.model;
import java.util.HashMap;
import org.json.JSONException;
import org.json.JSONObject;
/**
* <p>=================Eclipse====================
* <p>用户信息原型
* <p>2013-7-21下午4:56:19
* <p>============================================
* @author YI
*/
public class UserInfo extends Info{
private String userLogin;//用户登陆名
private String userName;//用户名
private String userPwd;//用户密码
private String note;//用户备注信息
private int flag;//标志
public UserInfo(){}
/**
* @param userlogin 登陆名
* @param username 用户名
* @param userpwd 密码
* @param note 备注
* @param flag 标志
*/
public UserInfo(String userlogin,String username,String userpwd,String note,int flag){
this.userLogin=userlogin;
this.userName=username;
this.userPwd=userpwd;
this.note=note;
this.flag=flag;
}
/**
* 通过HashMap对用户进行初始化
* @param map
*/
public UserInfo(HashMap<String, Object> map){
this.userName=map.get("username").toString();
this.userLogin=map.get("userlogin").toString();
this.userPwd=map.get("userpwd").toString();
this.note=map.get("note").toString();
this.flag=Integer.parseInt(map.get("username").toString());
}
/**
* 解析JSONObject数据对用户初始化
* @param jsonObject 一组JSONArray对象中一个JSONObject
* @throws JSONException
*/
public UserInfo(JSONObject jsonObject) throws JSONException{
this.userLogin = jsonObject.getString("userlogin");
this.userName = jsonObject.getString("username");
this.userPwd = jsonObject.getString("userpwd");
this.note = jsonObject.getString("note");
this.flag = Integer.parseInt(jsonObject.getString("flag"));
}
public String getUserLogin() {
return userLogin;
}
public void setUserLogin(String userLogin) {
this.userLogin = userLogin;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserPwd() {
return userPwd;
}
public void setUserPwd(String userPwd) {
this.userPwd = userPwd;
}
public String getNote() {
return note;
}
public void setNote(String note) {
this.note = note;
}
public int getFlag() {
return flag;
}
public void setFlag(int flag) {
this.flag = flag;
}
}
[备注，使用者可以不要使用Info类，笔者我是由于一些需要，没有用Info类，只需要把Info-〉UserInfo]
向服务器接收信息的链接服务类：
package net.palm_on_campus.service;
import java.io.InputStream;
import java.io.StringReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONObject;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;
import android.util.Xml;
import net.palm_on_campus.config.ShlConfig;
import net.palm_on_campus.model.Info;
import net.palm_on_campus.model.UserInfo;
import net.palm_on_campus.tools.Tools;
/**
* <p>=================Eclipse====================
* <p>程序服务类
* <p>JSON,XML数据加工
* <p>2013-7-21下午4:58:10
* <p>============================================
* @author YI
*/
public class CampusService implements ShlConfig{
/**
* ------------------------------
* @param PATH 请求服务地址
* @return
* @throws Exception
* 2013-7-22
* @-----------------------------
*/
public static List<Info> getHTTPData(String PATH) throws Exception{
URL url = new URL(PATH);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5000);
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(true);
conn.setRequestMethod("GET");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Charset", "UTF-8");
conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
if(conn.getResponseCode()==200){
InputStream inStream=conn.getInputStream();
if(PATH.indexOf("format=json")!=-1)
return Tools.parseJSON(inStream);
else
return Tools.parseXML(inStream);
}
return null;
}
}
Activity：
package net.palm_on_campus.campus;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import net.palm_on_campus.config.ShlConfig;
import net.palm_on_campus.model.Info;
import net.palm_on_campus.model.UserInfo;
import net.palm_on_campus.service.CampusService;
import com.palm_on_campus.campus.R;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;
/**
* <p>=================Eclipse====================
* <p>MainActivity程序的入口
* <p>2013-7-21下午4:52:29
* <p>============================================
* @author YI
*/
public class MainActivity extends Activity implements ShlConfig{
/** Called when the activity is first created. */
public static MainActivity app;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
app=this;
ListView listView=(ListView)findViewById(R.id.listView1);
try {
List<Info> userinfo =CampusService.getHTTPData(SER_URL+"?format=json");
//List<UserInfo> userinfo =CampusService.getJSONData();
List<HashMap<String,Object>> data = new ArrayList<HashMap<String,Object>>();
for(Info user:userinfo){
HashMap<String, Object> map=new HashMap<String, Object>();
map.put("username", user.getUserName());
map.put("userlogin", user.getUserLogin());
map.put("note", user.getNote());
map.put("pwd", "*********"/*user.getUserPwd()*/);
map.put("flag", user.getFlag());
data.add(map);
}
SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.item,
new String[]{"username","userlogin","note","pwd","flag"},
new int[]{R.id.tv1,R.id.tv2,R.id.tv3,R.id.tv4,R.id.tv5});
listView.setAdapter(adapter);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
[SER_URL定义在接口中，可直接改为地址]
package net.palm_on_campus.config;
/**
* <p>=================Eclipse====================
* <p>配置文件定义为接口
* <p>2013-7-21下午4:53:42
* <p>============================================
* @author YI
*/
public interface ShlConfig {
/**
* 服务器地址
*/
final String SER_URL="http://192.168.1.44:8080/campus1_1/UserInfoServlet";
}
有问题可以e-mail我：[email protected]
[初学，还请多多指教]