怎樣在Android訪問php取回json數據

1. [代碼]php代碼    
1 $array = array(

2   'username'=>'楊鑄',

3   'password'=>'123456',

4   'user_id'=>1

5 );

6 echo json_encode($array);

2. [代碼]java代碼    
01 private void startUrlCheck(String username,String password)

02 {

03     HttpClient client = new DefaultHttpClient();

04     StringBuilder builder = new StringBuilder();

05  

06     HttpGet myget = new HttpGet("http://10.0.2.2/Android/index.php");

07     try {

08         HttpResponse response = client.execute(myget);

09         BufferedReader reader = new BufferedReader(new InputStreamReader(

10         response.getEntity().getContent()));

11         for (String s = reader.readLine(); s != null; s = reader.readLine()) {

12             builder.append(s);

13         }

14         JSONObject jsonObject = new JSONObject(builder.toString());

15         String re_username = jsonObject.getString("username");

16         String re_password = jsonObject.getString("password");

17         int re_user_id = jsonObject.getInt("user_id");

18         setTitle("用戶id_"+re_user_id);

19         Log.v("url response", "true="+re_username);

20         Log.v("url response", "true="+re_password);

21     } catch (Exception e) {

22         Log.v("url response", "false");

23         e.printStackTrace();

24     }

25 }

3. [代碼]運行說明    
01 其中http://10.0.2.2為Android訪問本機url的ip地址。對應電腦上測試的http://127.0.0.1

02  

03 另外執行代碼時會拋出異常

04  

05 java.net.SocketException: Permission denied

06  

07 此為應用訪問網絡的權限不足 在AndroidManifest.xml中，需要進行如下配置：

08 <uses-permission Android:name="android.permission.INTERNET" />

09 就加在

10 </manifest>

11 之前就好了

12 然後測試通過。