android：错误字符0的输入结束

Question

我试图在java中检索json数组。但是我的json解析器中一直出现错误。我检查了json数组，它是有效的。 php脚本也可以正常使用！

Jsonparser：

public class JSONParser {

static InputStream is = null;
static JSONObject jObj = null;
static String json = "";

// constructor
public JSONParser() {}

public JSONObject makeHttpRequest(String url, String method,List<NameValuePair> params){

    try {

        // check for request method
        if(method == "POST"){
            // request method is POST
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            httpPost.setEntity(new UrlEncodedFormEntity(params));

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

        }else if(method == "GET"){
            // request method is GET
            DefaultHttpClient httpClient = new DefaultHttpClient();
            String paramString = URLEncodedUtils.format(params, "utf-8");
            url += "?" + paramString;
            HttpGet httpGet = new HttpGet(url);

            HttpResponse httpResponse = httpClient.execute(httpGet);
            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) {
            sb.append(line + "\n");
        }
        is.close();
        json = sb.toString();
    } catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }

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

    // return JSON String
    return jObj;
}

}

这是asynctask：

class GetFriendsInfo extends AsyncTask<String, String, String>{

    String id = "";
    String fullName = "";
    String birthday = "";

    protected void onPreExecute() {
        super.onPreExecute();
        pd_GetData = new ProgressDialog(MainActivity.this);
        pd_GetData.setMessage("Getting friend data");
        pd_GetData.setIndeterminate(false);
        pd_GetData.setCancelable(true);
        pd_GetData.show();
    }

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

        List<NameValuePair> param = new ArrayList<NameValuePair>();
        param.add(new BasicNameValuePair("user_id", id));
        param.add(new BasicNameValuePair("user_id", fullName));
        param.add(new BasicNameValuePair("user_id", birthday));

        JSONObject jsonObject = jsonParser.makeHttpRequest(url_get_birthdays,"GET", param);

        try{
            int success = jsonObject.getInt(TAG_SUCCESS);

            if (success == 1){
                Log.d("PHP Server [GET]", "Retrieved user data");
                Log.d("Returned data", jsonObject.toString());
            }else{
                Log.d("PHP Server [GET]", "Failed retrieve user data");
            }
        }catch (JSONException e){
            e.printStackTrace();
        }catch (RuntimeException e){
            e.printStackTrace();
        }

        return null;
    }

    protected void onPostExecute(String file_url) {
        // dismiss the dialog once done
        pd_GetData.dismiss();
    }
}

这是我得到的错误：

E/JSON Parser﹕ Error parsing data org.json.JSONException: End of input at character 0 of

这是我试图发送的Jsondata。

{"success":"1","message":"[{\"id\":\"384068195067419\",\"birthday\":\"09\\\/05\\\/1993\",\"fullName\":\"Japie Geluk\"},{\"id\":\"100003779318471\",\"birthday\":\"01\\\/01\\\/1980\",\"fullName\":\"Bobby Sleutelhanger\"}]"}