Question

我正在运行asyncTask以从HttpPost检索JSON对象数组。

来自webservice的输出是：

  [
    {
        "id": 1,
        "question": "What town were you born in?"
    },
    {
        "id": 2,
        "question": "What is your mothers maiden name?"
    },
    {
        "id": 3,
        "question": "Who was your childhood hero?"
    }
]

但是得到JSONException：

org.json.JSONException: End of input at character 0 of

以下代码中的JArray：

JSONArray JArray;

Context ra;

public SecurityQuestionsTask(Context _registerActivity) {
    ra = _registerActivity;
    JArray = new JSONArray();
}

@Override
protected Long doInBackground(String... langs) {

    Long result = 0L;

    String lang = Locale.getDefault().getLanguage();

    String[] langArray = {"en", "de", "fr"};

    if (!Arrays.asList(langArray).contains(lang)) {
        lang = "en";
    }

    try {

        // Create a new HttpClient and Post Header
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://webservice.com/api/v1/securityquestions?lang=" + lang);

            // Execute HTTP Post Request
            HttpResponse response = httpclient.execute(httppost);
            JSONString = EntityUtils.toString(response.getEntity(), "UTF-8");
            JArray = new JSONArray(JSONString);

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



    publishProgress("Retrieving security questions...");

    return result;
}

我是否正确地将response解析为JSONArray？

编辑：

这就是网络服务响应的方式：

return Response.status(200).entity(json.toString()).build();

Answer 1

线索出现在问题标题中！

我必须使用HttpGet而不是HttpPost来设置我的网络服务。

所以这一行：

HttpPost httppost = new HttpPost("http://webservice.com/api/v1/securityquestions?lang=" + lang);

必须改为：

HttpGet httpGet = new HttpGet("http://webservice.com/api/v1/securityquestions?lang=" + lang);

Answer 2

如果String回复与您发布的回复相似，请尝试

     // Execute HTTP Post Request
     HttpResponse response = httpclient.execute(httppost);
     String resp = EntityUtils.toString(response.getEntity(), "UTF-8");
     JSONArray jsonArr = new JSONArray(resp);

从GET请求接收空JSON数组

2 个答案: