android使用JSON進(jìn)行網(wǎng)絡(luò)數(shù)據(jù)交換(服務(wù)端、客戶端)的實(shí)現(xiàn)

四錦年 2013-04-23

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android使用JSON進(jìn)行網(wǎng)絡(luò)數(shù)據(jù)交換(服務(wù)端、客戶端)的實(shí)現(xiàn)

by 雪夜&流星,

服務(wù)端需要加上json.jar包，下載地址：https://github.com/upictec/org.json.me

服務(wù)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;

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

/**
* 處理get方式提交的數(shù)據(jù)
*/
@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();

//準(zhǔn)備用戶數(shù)據(jù) 
prepareData();

//JSON數(shù)組 
JSONArray array = new JSONArray();

for(User bean:list){
//單個(gè)用戶JSON對(duì)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); 
} 
//輸出 
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中配置映射路徑：

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

客戶端：

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();
// 在測試過程中，經(jīng)常是用本機(jī)做測試服務(wù)器，訪問本機(jī)的IP地址要設(shè)置為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();

// 設(shè)置網(wǎng)絡(luò)超時(shí)參數(shù)
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();
}

}

服務(wù)端截圖：

客戶端截圖：

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