BufferedReader reader.readLine（）返回null

Question

我有jsonparser类逐行读取页面并在我的jsonparser类中将其转换为json.But，当我尝试逐行读取页面时，readLine（）返回null。

这是我的JsonParser.java

final String TAG = "JsonParser.java";
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
 public JSONObject getJSONFromUrl(String url) {
    // make HTTP request
    try {

        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        is = httpEntity.getContent();          

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {

        BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;

        while ((line = reader.readLine()) != null) {
            if(line.contains(";"))
            {
            line=line.replace(";", "");
            }
            if(line.contains("info = "))
            {
                line.replace("info = ","");
            }
            sb.append(line + "\n");
        }
        is.close();
        Log.e(TAG, "Control5");

            json=sb.toString();

    }catch(IOException e)
    {
        Log.e(TAG, "IOException occurred!!");
    }
    catch (Exception e) {
        Log.e(TAG, "Error converting result " + e.toString());

    }

    // try parse the string to a JSON object
    try {
        Log.e(TAG,json);
        jObj = new JSONObject(json);
    } catch (JSONException e) {
        Log.e(TAG, "Error parsing data " + e.toString());
    }

    // return JSON String
    return jObj;
}

我在Asynctask的MainActivity.java中使用这个类。

String videoid="mAQln4dgR24";
    long currenttime=System.currentTimeMillis() / 1000;

    yourJsonStringUrl="http://www.youtube-mp3.org/a/itemInfo/?video_id="+videoid+"&ac=www&t=grp&r="+currenttime;
    /*
    //if you want to see the page use browserintent.
    Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(yourJsonStringUrl));
    startActivity(browserIntent);
    */

JsonParser jParser = new JsonParser();
        // get json string from url
        JSONObject json = jParser.getJSONFromUrl(yourJsonStringUrl);

链接＆＃34; jsonstringurl＆＃34;将在程序运行时生成。 它打破了很少的时间。如果你想看到页面使用浏览器意图。