Android 检索HttpPost的实体时出错

下面是我要发布的代码，然后从url获取响应。。。 无论何时运行代码，我都不会在Bufferedreader中得到响应

protected Void doInBackground(String... urls) {

    try{

    HttpClient httpclient = new DefaultHttpClient();

    HttpPost httppost = new HttpPost("http://www.indianrail.gov.in/pnr_Enq.html");

    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

     response = httpclient.execute(httppost);

    }catch(Exception e){

    Log.e("log_tag", "Error in http connection "+e.toString());

    }

    return null;

    }


protected void onPostExecute(Void unused) {

    Dialog.dismiss();
    HttpEntity httpEntity= response.getEntity();
    Toast.makeText(getApplicationContext(), "resp of :"+response.getEntity().getContentLength(), Toast.LENGTH_SHORT).show();

    try {
        Toast.makeText(getApplicationContext(), "in", Toast.LENGTH_SHORT).show();
        Toast.makeText(getApplicationContext(), ""+response.getEntity().getContentLength(), Toast.LENGTH_SHORT).show();
        in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
        Toast.makeText(getApplicationContext(), "string creating :)",Toast.LENGTH_SHORT).show();
       Toast.makeText(getApplicationContext(), ""+line, Toast.LENGTH_SHORT).show();
    }  catch (Exception e) {
        // TODO Auto-generated catch block
        Toast.makeText(getApplicationContext(), "error", Toast.LENGTH_SHORT).show();

        e.printStackTrace();
    }

我在postExecute方法中的Bufferedreader处出错。。。 LogCat o/p如下所示

E/ActivityThread(611): Service com.android.exchange.ExchangeService has leaked ServiceConnection com.android.emailcommon.service.ServiceProxy$ProxyConnection@40cf4cf0 that was originally bound here

请尝试以下操作：

如果您的响应是json，请按以下方式使用代码，然后使用

doInBackground（Void…params）

中实体的“响应”：

---

用错误回复您得到的结果。

在哪里声明响应？

DefaultHttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(serviceURL);                                   
request.setHeader("Accept", "application/json");
request.setHeader("Content-type", "application/json");
HttpResponse response = client.execute(request);
HttpEntity entity = response.getEntity();