JSON響應不回來從.asmx web服務在android中

Question

我創建一個應用程序，從Web服務獲取Json響應。該應用程序在2個文件中是一個webclient和一個webserviceActivity。客戶端回來了，我認爲logcat正在打印HTTP/1.1 200 OK。之後，似乎有一個JSONException。它可能與URL中傳遞的第二個參數的格式有關，因爲它是日期。我嘗試傳遞一個字符串，但無濟於事。我在這裏完成的方式是從sql.Date（yyyy mm dd）創建一個日期對象，並將其傳入。以這種方式，我在JSONException之前從服務器返回了一點。

以下是這些文件。提前致謝。

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.util.ArrayList; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.content.ContentValues; 
import android.util.Log; 

public class WebClient { 

    private static final String TAG = WebClient.class.getSimpleName(); 



    private static String convertStreamToString(InputStream is) { 
     /* 
     * To convert the InputStream to String we use the 
     * BufferedReader.readLine() method. We iterate until the BufferedReader 
     * return null which means there's no more data to read. Each line will 
     * appended to a StringBuilder and returned as String. 
     */ 
     BufferedReader reader = new BufferedReader(new InputStreamReader(is)); 
     StringBuilder sb = new StringBuilder(); 

     String line = null; 
     try { 
      while ((line = reader.readLine()) != null) { 
       sb.append(line + "\n"); 
      } 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } finally { 
      try { 
       is.close(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } 
     return sb.toString(); 
    } 

    /* 
    * This is a test function which will connects to a given rest service and 
    * prints it's response to Android Log with labels "Praeda". 
    */ 
    public JSONObject connect(String url) { 

     JSONObject json = null; 
     HttpClient httpclient = new DefaultHttpClient(); 

     // Prepare a request object 
     HttpGet httpget = new HttpGet(url); 

     // Execute the request 
     HttpResponse response; 
     try { 
      response = httpclient.execute(httpget); 
      // Examine the response status 
      Log.i(TAG, response.getStatusLine().toString()); 

      // Get hold of the response entity 
      HttpEntity entity = response.getEntity(); 
      // If the response does not enclose an entity, there is no need 
      // to worry about connection release 

      if (entity != null) { 

       // A Simple JSON Response Read 
       InputStream instream = entity.getContent(); 
       String result = convertStreamToString(instream); 
       Log.i(TAG, result); 

       // A Simple JSONObject Creation 
       json = new JSONObject(result); 



       // Closing the input stream will trigger connection release 
       instream.close(); 

      } 

     } catch (ClientProtocolException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (JSONException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
     return json; 

    } 
} 

。

import java.sql.Date; 

import org.json.JSONObject; 

import android.app.Activity; 
import android.os.Bundle; 
import android.util.Log; 
import android.widget.TextView; 

public class WebserviceActivity extends Activity { 

    private static final String TAG = WebserviceActivity.class.getSimpleName(); 
    TextView tv = null; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     setContentView(R.layout.activity_main); 

     tv = (TextView) findViewById(R.id.textviewwebserviceresponse); 

     WebClient rc = new WebClient(); 


     @SuppressWarnings("deprecation") 
     Date d = new Date(2012, 9, 3); 
     JSONObject jObj = rc 
       .connect("http://212.169.27.217:84/rotaservice.asmx/GetRota?CarerID=36&RotaDate="+d); 
     Log.e(TAG, "json obj = " + jObj.toString()); 
     tv.setText(jObj.toString()); 

    }// end of onCreate 

}// end of class 

。

09-03 19:52:00.490: I/global(21931): In close() at SocketHttpClientConnection 
09-03 19:52:00.490: I/global(21931): call createSocket() return a new socket. 
09-03 19:52:03.610: I/WebClient(21931): HTTP/1.1 200 OK 
09-03 19:52:03.610: I/WebClient(21931): <?xml version="1.0" encoding="utf-8"?> 
09-03 19:52:03.610: I/WebClient(21931): <string xmlns="http://tempuri.org/">{"0":{"StartDate":"","EndDate":"","Duration":"0","CallStatusID":"0","CallStatusName":"","ClientSurname":"","ClientForename":"","NeedName":"Out of range","CarerAwayReason":"","CallID":"","DoubleUpCallID":""}}</string> 
09-03 19:52:03.620: W/System.err(21931): org.json.JSONException: Value <?xml of type java.lang.String cannot be converted to JSONObject 
09-03 19:52:03.620: W/System.err(21931): at org.json.JSON.typeMismatch(JSON.java:111) 
09-03 19:52:03.620: W/System.err(21931): at org.json.JSONObject.<init>(JSONObject.java:158) 
09-03 19:52:03.620: W/System.err(21931): at org.json.JSONObject.<init>(JSONObject.java:171) 
09-03 19:52:03.620: W/System.err(21931): at com.carefreegroup.WebClient.connect(WebClient.java:87) 
09-03 19:52:03.620: W/System.err(21931): at com.carefreegroup.WebserviceActivity.onCreate(WebserviceActivity.java:31) 
09-03 19:52:03.620: W/System.err(21931): at android.app.Activity.performCreate(Activity.java:4543) 
09-03 19:52:03.620: W/System.err(21931): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1071) 
09-03 19:52:03.620: W/System.err(21931): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2181) 
09-03 19:52:03.620: W/System.err(21931): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2260) 
09-03 19:52:03.620: W/System.err(21931): at android.app.ActivityThread.access$600(ActivityThread.java:139) 
09-03 19:52:03.620: W/System.err(21931): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1277) 
09-03 19:52:03.620: W/System.err(21931): at android.os.Handler.dispatchMessage(Handler.java:99) 
09-03 19:52:03.620: W/System.err(21931): at android.os.Looper.loop(Looper.java:156) 
09-03 19:52:03.620: W/System.err(21931): at android.app.ActivityThread.main(ActivityThread.java:5045) 
09-03 19:52:03.620: W/System.err(21931): at java.lang.reflect.Method.invokeNative(Native Method) 
09-03 19:52:03.630: W/System.err(21931): at java.lang.reflect.Method.invoke(Method.java:511) 
09-03 19:52:03.630: W/System.err(21931): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
09-03 19:52:03.630: W/System.err(21931): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
09-03 19:52:03.630: W/System.err(21931): at dalvik.system.NativeStart.main(Native Method) 
09-03 19:52:03.630: D/AndroidRuntime(21931): Shutting down VM 

Answer 1

服務返回與JSON XML字符串tag中，你必須解析XML得到它包含了JSON。