android使用JSON进行网络数据交换(服务端、客户端)的实现

服务端需要加上json.jar包，下载地址：https://github.com/upictec/org.json.me

服务端：

JSONDemoServlet.java

package com.test.Demo;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
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.json.me.JSONArray;
import org.json.me.JSONObject;

public class JSONDemoServlet extends HttpServlet {
private static final long serialVersionUID = - 7368225680407826408L ;
private List < User > list;

/**
* 处理post方式提交的数据
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

/**
* 处理get方式提交的数据
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType( " text/plain " );
response.setCharacterEncoding( " UTF-8 " );
PrintWriter out = response.getWriter();

// 准备用户数据
prepareData();

// JSON数组
JSONArray array = new JSONArray();

for (User bean:list){
// 单个用户JSON对象
JSONObject obj = new JSONObject();
try {

obj.put( " id " , bean.getId());
obj.put( " name " , bean.getName());
obj.put( " email " , bean.getEmail());
obj.put( " gender " , bean.getGender());
} catch (Exception e) {
// TODO: handle exception
}
array.put(obj);
}
// 输出
out.write(array.toString());
out.flush();
out.close();
}

private void prepareData()
{
list = new ArrayList < User > ();
User bean1 = new User();
bean1.setId( 1001 );
bean1.setName( " Tony " );
bean1.setEmail( " tony@toeach.net " );
bean1.setGender( " male " );
list.add(bean1);

User bean2 = new User();
bean2.setId( 1002 );
bean2.setName( " Jack " );
bean2.setEmail( " jack@hotmail.com " );
bean2.setGender( " male " );
list.add(bean2);

User bean3 = new User();
bean3.setId( 1003 );
bean3.setName( " Marry " );
bean3.setEmail( " marry@163.com " );
bean3.setGender( " female " );
list.add(bean3);

User bean4 = new User();
bean4.setId( 1004 );
bean4.setName( " Linda " );
bean4.setEmail( " linda@21cn.com " );
bean4.setGender( " female " );
list.add(bean4);
}

}

User.java

package com.test.Demo;

public class User {
private int id;

private String name;

private String email;

private String gender;

public String getEmail() {
return email;
}

public void setEmail(String email) {
this .email = email;
}

public String getGender() {
return gender;
}

public void setGender(String gender) {
this .gender = gender;
}

public int getId() {
return id;
}

public void setId( int id) {
this .id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this .name = name;
}

}

web.xml中配置映射路径：

<? xml version = " 1.0 " encoding = " UTF-8 " ?>
< web - app version = " 2.5 "
xmlns = " http://java.sun.com/xml/ns/javaee "
xmlns:xsi = " http://www.w3.org/2001/XMLSchema-instance "
xsi:schemaLocation = " http://java.sun.com/xml/ns/javaee
http: // java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

< servlet >
< servlet - name > JSONDemoServlet </ servlet - name >
< servlet - class > com.test.Demo.JSONDemoServlet </ servlet - class >
</ servlet >

< servlet - mapping >
< servlet - name > JSONDemoServlet </ servlet - name >
< url - pattern >/ JSONDemoServlet </ url - pattern >
</ servlet - mapping >

< welcome - file - list >
< welcome - file > index.jsp </ welcome - file >
</ welcome - file - list >

</ web - app >

客户端：

package com.test;

import java.io.BufferedReader;
import java.io.InputStreamReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.json.JSONArray;
import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.main);

try {
StringBuffer sb = new StringBuffer();
// 在测试过程中，经常是用本机做测试服务器，访问本机的IP地址要设置为10.0.2.2
String url = " http://10.0.2.2:8080/article/JSONDemoServlet " ;
String body = getContent(url);
JSONArray array = new JSONArray(body);
for ( int i = 0 ; i < array.length(); i ++ ) {
JSONObject obj = array.getJSONObject(i);
sb.append( " id: " ).append(obj.getInt( " id " )).append( " \t " );
sb.append( " name: " ).append(obj.getString( " name " )).append( " \r\n " );
sb.append( " gender: " ).append(obj.getString( " gender " )).append(
" \t " );
sb.append( " email: " ).append(obj.getString( " email " )).append(
" \r\n " );
sb.append( " ----------------------\r\n " );
}
TextView textView = (TextView) findViewById(R.id.textView);
textView.setText(sb.toString());
} catch (Exception e) {
// TODO: handle exception
}

}

private String getContent(String url) throws Exception {
StringBuilder sb = new StringBuilder();
HttpClient client = new DefaultHttpClient();
HttpParams httpParams = client.getParams();

// 设置网络超时参数
HttpConnectionParams.setConnectionTimeout(httpParams, 3000 );
HttpConnectionParams.setSoTimeout(httpParams, 5000 );
HttpResponse response = client.execute( new HttpGet(url));
HttpEntity entity = response.getEntity();
if (entity != null ) {
BufferedReader reader = new BufferedReader( new InputStreamReader(
entity.getContent(), " UTF-8 " ), 8192 );
String line = null ;
while ((line = reader.readLine()) != null ) {
sb.append(line + " \n " );
}
reader.close();
}

return sb.toString();
}

}

服务端截图：

android使用JSON进行网络数据交换(服务端、客户端)的实现

客户端截图：

android使用JSON进行网络数据交换(服务端、客户端)的实现

秒客网

android使用JSON进行网络数据交换(服务端、客户端)的实现

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