<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
  <package name="struts2" extends="struts-default" namespace="/">
    <action name="getjson" class="com.shao.action.JSONAction"
      method="json">
      <result name="success">index.jsp</result>
    </action>
  </package>
</struts> 

package com.shao.domain;

public class Music {  
  
  private Integer id;   
  private String name;   
  private String time;  
  private String author;  
  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 getTime() {  
    return time;  
  }  
  public void setTime(String time) {  
    this.time = time;  
  }  
  public String getAuthor() {  
    return author;  
  }  
  public void setAuthor(String author) {  
    this.author = author;  
  }   
}  

package com.shao.action;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;

import com.google.gson.Gson;
import com.opensymphony.xwork2.ActionSupport;
import com.shao.domain.Music;

public class JSONAction extends ActionSupport implements ServletRequestAware,
    ServletResponseAware {

  /** 
   *  
   */
  private static final long serialVersionUID = -3604892179657815531L;
  private HttpServletRequest request;
  private HttpServletResponse response;
  private String format;

  public String getFormat() {
    return format;
  }

  public void setFormat(String format) {
    this.format = format;
  }

  @Override
  public void setServletRequest(HttpServletRequest request) {
    this.request = request;
  }

  @Override
  public void setServletResponse(HttpServletResponse response) {
    this.response = response;
  }

  public void json() {
    List<Music> list = new ArrayList<Music>();
    Gson gson = new Gson();
    Music m1 = new Music();
    m1.setId(1);
    m1.setAuthor("周");
    m1.setName("外婆");
    m1.setTime("04:04");
    list.add(m1);
    Music m2 = new Music();
    m2.setId(2);
    m2.setAuthor("周杰倫");
    m2.setName("半獸人");
    m2.setTime("04:05");
    list.add(m2);
    Music m3 = new Music();
    m3.setId(3);
    m3.setAuthor("周杰倫");
    m3.setName("烏克麗麗");
    m3.setTime("02:55");
    list.add(m3);
    java.lang.reflect.Type type = new com.google.gson.reflect.TypeToken<List<Music>>() {
    }.getType(); // 指定type
    String beanListToJson = gson.toJson(list, type); // list轉(zhuǎn)換成json字符串
    System.out.println("GSON-->" + beanListToJson);
    try {
      response.setContentType("application/json; charset=GBK");
      response.setCharacterEncoding("UTF-8");
      this.response.getWriter().write(beanListToJson);
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

package com.example.test2;

import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;
import com.lidroid.xutils.http.client.HttpRequest.HttpMethod;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;


public class MainActivity extends ActionBarActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final TextView text = (TextView) findViewById(R.id.text);
    HttpUtils httpUtils = new HttpUtils();
    httpUtils.send(HttpMethod.POST, "http://192.168.199.171:8080/Test2/getjson.action", new RequestCallBack<String>() {

      public void onFailure(HttpException arg0, String arg1) {
        Log.d("=====================onFailure", arg1+";"+arg0.toString());
        
      }

      public void onSuccess(ResponseInfo<String> arg0) {
        Log.d("=====================onSuccess", arg0.result);
        text.setText(arg0.result);
      }
    
      
    });
  }


  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
      return true;
    }
    return super.onOptionsItemSelected(item);
  }
}