从Android的REST服务器获取JSON时发生FileNotFound异常

问题描述：

从REST服务器获取JSON数据时遇到问题。 Web浏览器返回JSON数据here正确，但下面的代码将导致FileNotFound例外：从Android的REST服务器获取JSON时发生FileNotFound异常

private void getJSON(String url) { 
    class GetJSONServices extends AsyncTask<String, Void, String> { 
     ProgressDialog loading; 

     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      loading = new ProgressDialog(ServicesActivity.this); 
      loading.setTitle(""); 
      loading.setMessage("Getting your services..."); 
      loading.setCancelable(false); 
      loading.show(); 
     } 

     @Override 
     protected String doInBackground(String... params) { 

      String uri = params[0]; 

      BufferedReader bufferedReader = null; 
      try { 
       URL url = new URL(uri); 
       HttpURLConnection con = (HttpURLConnection) url.openConnection(); 
       StringBuilder sb = new StringBuilder(); 

       bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream())); 

       String json; 
       while((json = bufferedReader.readLine())!= null){ 
        sb.append(json+"\n"); 
       } 

       return sb.toString().trim(); 

      }catch(Exception e){ 
       Log.e("Do In Background", getStackTrace(e)); 
       return null; 
      } 

     } 

     @Override 
     protected void onPostExecute(String s) { 
      super.onPostExecute(s); 

      loading.dismiss(); 
      try { 
       JSONObject jsonObject = new JSONObject(s); 
       Toast.makeText(ServicesActivity.this, s, Toast.LENGTH_SHORT).show(); 
      } 
      catch (Exception e) { 
       Log.e("On Post Execute", getStackTrace(e)); 
      } 

     } 
    } 
    GetJSONServices gj = new GetJSONServices(); 
    gj.execute(url); 
}

此外，AndroidManifest.xml中有INTERNET权限，其余服务器允许CORS。是什么导致了这个错误，我该如何解决？

编辑：我使用HttpURLConnection，而不是删除的HttpClient。

什么是'sb.toString（）'的输出？ –

[在Web服务中读取Json在Android中休息。 FileNotFoundException]（http://*.com/questions/11978412/reading-json-in-webservice-rest-in-android-filenotfoundexception） – Sree

发布logcat – Pankaj

答

我使用commons.io.2.4库在这个例子中，

显然我没有得到的错误，你可以看到输出，

public static void main(String[] args) { 
    try { 

     URL url = new URL("http://eventoserver-ecinauce.rhcloud.com/songwol/services"); 
     HttpURLConnection connection = (HttpURLConnection)url.openConnection(); 
     connection.connect(); 

     String result = IOUtils.toString(connection.getInputStream()); 
     System.out.println(""+result); 

    } catch (Exception e) { 
     // TODO: handle exception 
    } 
}

输出

{ 
    "3": { 
    "id": 3, 
    "info": null, 
    "name": "singer", 
    "owner": 1, 
    "packages": {}, 
    "reviews": {}, 
    "type": "performer" 
    } 
}

从Android的REST服务器获取JSON时发生FileNotFound异常

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