执行http POST会返回HTML而不是JSON

Question

编辑完全重新解决问题以便更好地理解

我必须使用2个POST参数查询给定的网址http://api.bf3stats.com/pc/player/：'播放器'（播放器名称）和'opt'（选项）。我已在http://www.requestmaker.com/上使用以下数据对其进行了测试：player=Zer0conf&opt=all。我得到了正确的JSON响应（我以为我不知道他们的网站如何执行查询，我猜它是php）。现在我想在Android中做同样的事情：

  private StringBuilder inputStreamToString(InputStream is) {
       //this method converts an inputStream to String representation
    String line = "";
    StringBuilder total = new StringBuilder();

    BufferedReader rd = new BufferedReader(new InputStreamReader(is));

    try {
        while ((line = rd.readLine()) != null) {
            total.append(line);
        }
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return total;
}

这就是我提出请求的方式：

 public void postData(String url, String name) {

    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost(url);

    try {

        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
                    //qname is a String containing a correct player name
        nameValuePairs.add(new BasicNameValuePair("player", qname));
        nameValuePairs.add(new BasicNameValuePair("opt", "all"));
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

        HttpResponse response = httpclient.execute(httppost);
        //test is just a string to check the result, which should be in JSON format
        test = inputStreamToString(response.getEntity().getContent())
                .toString();

    } catch (ClientProtocolException e) {

    } catch (IOException e) {

    }
}

我在'test'中得到的字符串不是JSON，而是一些bf3stats页面的完整HTML标记。我的请求可能有什么问题？

Answer 1

您需要在请求标头中为要发送的数据类型设置内容类型"application/x-www-form-urlencoded"。

我为上面提到的数据测试了你的API，它工作正常，我收到了大量的数据作为回应。你可以找到它here。

您可以尝试以下代码：

public  String postDataToServer(String url) throws Throwable
    {

    HttpPost request = new HttpPost(url);
    StringBuilder sb=new StringBuilder();

    String requestData = prepareRequest();
    StringEntity entity = new StringEntity(requestData);
                         entity.setContentType("application/x-www-form-urlencoded;charset=UTF-8");//text/plain;charset=UTF-8
                         request.getParams().setParameter(CoreProtocolPNames.USE_EXPECT_CONTINUE, Boolean.FALSE);

                         request.setHeader("Accept", "application/json");
                         request.setEntity(entity); 
                         // Send request to WCF service 
                         HttpResponse response =null;
                         DefaultHttpClient httpClient = new DefaultHttpClient();
                         //DefaultHttpClient httpClient = getNewHttpClient();
                         HttpConnectionParams.setSoTimeout(httpClient.getParams(), 10*1000); 
                         HttpConnectionParams.setConnectionTimeout(httpClient.getParams(),10*1000); 
                         try{

                         response = httpClient.execute(request); 
                         }
                         catch(SocketException se)
                         {
                             Log.e("SocketException", se+"");
                             throw se;
                         }
                         /* Patch to prevent user from hitting the request twice by clicking 
                          * the view [button, link etc] twice.
                          */
                         finally{
                         }



    InputStream in = response.getEntity().getContent();
    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
    String line = null;
    while((line = reader.readLine()) != null){
        sb.append(line);

    }
    Log.d("response in Post method", sb.toString()+"");
    return sb.toString();
    }

    public String prepareRequest()
    {

        return "player=Zer0conf&opt=all";
    }

编辑：我的网络服务出现错误期望失败错误 - 417 。所以我们需要在我们的请求中添加一个参数。它是request.getParams().setParameter(CoreProtocolPNames.USE_EXPECT_CONTINUE, Boolean.FALSE);。我用这个更新了上面的代码。现在它工作正常。

响应看起来像这样。

希望这会有所帮助。

干杯
N_JOY

Answer 2

尝试在浏览器中查看url，我相信有一个！DOCTYPE声明，绝对无法解析为JSON对象。