客户端与服务器通过gson解析json数据

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package com.test;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class JsonClientActivity extends Activity {
/** Called when the activity is first created. */
private  Button  update;
private ListView listView;
@Override
public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      update = (Button) findViewById(R.id.update);
      listView = (ListView) findViewById(R.id.list);
      update.setOnClickListener(new OnClickListener() {

         @Override
         public void onClick(View v) {
            // TODO Auto-generated method stub
            String urlStr="http://192.168.0.9:8000/TestServer/getjson.action";
            String  result  = GsonUtil.getJson(urlStr);

            List<Music>  list = GsonUtil.getListFromJson(result);
            List<Map<String,Object>>  data  = getAdapterData(list);

             SimpleAdapter  adapter  =new  SimpleAdapter(JsonClientActivity.this, data, R.layout.list, new String[]{"name","author","time"}, new int[]{R.id.name,R.id.author,R.id.time});
         listView.setAdapter(adapter);
         //listView.
         }
      });
}
private List<Map<String,Object>>  getAdapterData(List  list){

List<Map<String,Object>> data = new ArrayList<Map<String,Object>>();
for(int i=0;i<list.size();i++){

              Map<String,Object>  map = new HashMap<String, Object>();
            Music music= (Music)list.get(i);
            map.put("name",music.getName());
            map.put("author", music.getAuthor());
            map.put("time",music.getTime());
            data.add(map);
      }
      return data;
}
}

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package com.test;

import java.net.URI;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import com.google.gson.Gson;

public class GsonUtil {
public static  String getJson(String  url){

      HttpClient client = new DefaultHttpClient();

      HttpPost  request;
      try {
      request = new HttpPost(new URI(url));
      HttpResponse  response  =  client.execute(request);
         // 判断请求是否成功
      if (response.getStatusLine().getStatusCode() == 200) { //200表示请求成功
         HttpEntity  entity = response.getEntity();
         if(entity!=null){
               String beanListToJson = EntityUtils.toString(entity,"GBK");
               return beanListToJson;
         }
      }

   } catch (Exception e) {
      // TODO: handle exception
   }
   return  null;
}
public  static  List<Music>  getListFromJson(String json){
   java.lang.reflect.Type type = new com.google.gson.reflect.TypeToken<List<Music>>() {
   }.getType();
   Gson gson = new Gson();
   List<Music>  list  = gson.fromJson(json.toString(), type);
   return list;
}
}

最后记得在manifest配置文件中添加uses-permission android:name="android.permission.INTERNET"