Json響應未打印

Question

我是Android和Java開發新手。我會高度讚賞，如果有人可以指導我：

我的代碼：

public class TokenPost extends MainActivity { 

public TokenPost(MainActivity mainActivity) { 
    // TODO Auto-generated constructor stub 
} 

public void postData() { 

    Thread thread = new Thread(new Runnable(){ 
     @Override 
     public void run() { 
      try { 

       try{ 
        // Create a new HttpClient and Post Header 
        HttpClient httpclient = new DefaultHttpClient(); 
        HttpPost httppost = new HttpPost("http://www.traxbuddy.com/confirm.json"); 

        Log.i("Inside TokenPost", "Inside TokenPost"); 
         List<NameValuePair> nameValuePair = new ArrayList<NameValuePair>(3); 
         //String foo= "id_token="+token+"&lat="+59.8944400+"&lng="+30.2641700; 
         //nameValuePair1.add(new BasicNameValuePair("id_token", token)); 
          Log.i("Mobile Token", "Mobile Token" + mtokenno); 
          nameValuePair.add(new BasicNameValuePair("mobile", "919876543285")); 
          nameValuePair.add(new BasicNameValuePair("imei", "911212345123891"/*imeicontact*/)); 
          nameValuePair.add(new BasicNameValuePair("stoken", mtokenno)); 

         // Execute HTTP Post Request 



         HttpResponse response = httpclient.execute(httppost); 
         Log.i("Response from Http Post Request", "Response from Http Post Request: "+ response); 

         System.out.println("Response: " +response.toString()); 

         Gson gson = new GsonBuilder().setPrettyPrinting().create(); 
         JsonParser jp = new JsonParser(); 
         JsonElement je = jp.parse(response.toString()); 
         String prettyJsonString = gson.toJson(je); 
         System.out.println(je); 
         System.out.println(prettyJsonString); 

         BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8")); 
         StringBuilder builder = new StringBuilder(); 
         for (line = null; (line = reader.readLine()) != null;) { 
          builder.append(line).append("\n"); 

          System.out.println(line); } 

        } 
        catch (ClientProtocolException e) { 
         // TODO Auto-generated catch block 
        } catch (IOException e) { 
         // TODO Auto-generated catch block 
        } 

      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
     } 
    }); 

    thread.start(); 


}//postData 
} 

，我在日誌中我得到的輸出是：

10-07 13:28:49.803: I/Inside TokenPost(1312): Inside TokenPost 
10-07 13:28:49.803: I/Mobile Token(1312): Mobile Tokennull 
10-07 13:29:02.573: I/Response from Http Post Request(1312): Response from Http Post Request: org.apache.http.message.BasicHttpResponse@b20e3f18 
10-07 13:29:02.573: I/System.out(1312): Response: org.apache.http.message.BasicHttpResponse@b20e3f18 
10-07 13:29:02.603: I/System.out(1312): "org.apache.http.message.BasicHttpResponse@b20e3f18" 
10-07 13:29:02.603: I/System.out(1312): "org.apache.http.message.BasicHttpResponse@b20e3f18" 
10-07 13:29:02.603: W/System.err(1312): java.lang.NullPointerException 
10-07 13:29:02.613: W/System.err(1312): at com.traxbuddy.trax.TokenPost$1.run(TokenPost.java:68) 
10-07 13:29:02.613: W/System.err(1312): at java.lang.Thread.run(Thread.java:841) 

，我應該得到的輸出（我通過使用CURL）：

{"atoken":"11528aa467271341a624f362ee7dd268b0366016","utoken":"c6205d52218f6d466 
e2c4bac3ecc585ddab9db96"} 

在這方面的任何幫助將不勝感激。

Answer 1

我的猜測是response.getEntity().getContent()返回null，觸發NPE。

您是否嘗試過反序列化使用這個身體：

import org.apache.http.util.EntityUtils; 
// ... 
String json = EntityUtils.toString(response.getEntity(), "UTF-8"); 

Answer 2

你正在試圖解析response.toString()，這是"org.apache.http.message.BasicHttpResponse@b20e3f18"，作爲JsonElement，引發異常。

與

JsonElement je = jp.parse(EntityUtils.toString(response.getEntity()), "UTF-8");