android - 使用 JSON 时如何处理 500 Internal Server Error

Question

我是 Android 的新手，我正在使用 JSON 从服务器获取数据。在第 22 行的第一个循环中，StringBuilder 包含 500 Internal Server Error，然后 jArray 最终返回 null。我该如何处理这个错误？

public static JSONObject getJSON() {
    String jsonString = "";
    InputStream inStream = null;

    //http post
    JSONObject jArray = null;
    try {
        HttpClient httpClient = new DefaultHttpClient(new BasicHttpParams());
        HttpPost httpPost = new HttpPost(WS_URL);
        httpPost.setHeader("Content-type", "application/json");

        HttpResponse response = httpClient.execute(httpPost);
        HttpEntity entity = response.getEntity();
        inStream = entity.getContent();

        BufferedReader reader = new BufferedReader(new InputStreamReader(inStream, "UTF-8"), 8);
        StringBuilder sb = new StringBuilder();

        String line = null;

        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        inStream.close();
        jsonString = sb.toString();

        jArray = new JSONObject(jsonString);


        //outputTransactions(jArray);

    } catch (IOException e) {
        e.printStackTrace();
    } catch (JSONException e) {
        e.printStackTrace();
    }

    return jArray;
}

Answer 1

虽然回复晚了，但可能对其他人有帮助。在将其解析为 JSON 之前，您需要检查服务器的响应状态。

例如

int status_code=response.getStatusLine().getStatusCode();

if(status_code!=200){
    Log.d("MYLOG","ERROR! Response status is"+status_code);
  }
else{
    inStream = entity.getContent();
    BufferedReader reader = new BufferedReader(new InputStreamReader(inStream, "UTF-8"), 8);
    StringBuilder sb = new StringBuilder();

    String line = null;

    while ((line = reader.readLine()) != null) {
        sb.append(line + "\n");
    }
    inStream.close();


   // Rest of your code......
    }

或者您可以选择检查状态代码并向用户显示错误

喜欢:

else if(status_code==404){
 Log.d("MYLOG","Sorry! Page not found! Check the URL ");

}else if(status_code==500){
 Log.d("MYLOG","Server is not responding! Sorry try again later..");
}

希望对像你这样的新手有所帮助:-)