Question

我有脚本返回JSON这样

{"a":"something","b":"something"}
{"a":"something1","b":"something1"}

这是NDJSON的回复！现在我试图从android中检索它，但我在jsonResult上得到null。这是我在获取后使用的代码：

JSONObject jsonResponse = new JSONObject(jsonResult);
JSONArray jsonMainNode = new JSONArray(jsonResponse);

我在第一行得到空指针异常，因为jsonResult为null。有什么问题？

这是我如何获取：

HttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(url);

HttpResponse response = httpclient.execute(httpget);
jsonResult = inputStreamToString(
response.getEntity().getContent()).toString();

Answer 1

使用前检查结果是否为空

HttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(params[0]);

HttpResponse response = httpclient.execute(httpget);

jsonResult = inputStreamToString(response.getEntity().getContent()).toString();

if(result != null) {
    JSONObject jsonResponse = new JSONObject(jsonResult);
    JSONArray jsonMainNode = new JSONArray(jsonResponse);
} else {
    //Do something
}

现在您必须检查您的请求或inputStreamToString方法，以了解您的回复为何。

Answer 2

试试这个：

int status = response.getStatusLine().getStatusCode();
 HttpEntity httpEntity = response.getEntity();
            is = httpEntity.getContent();

BufferedReader reader = new BufferedReader(new InputStreamReader(is, HTTP.UTF_8), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null)
            {
                sb.append(line + "\n");
            }
            is.close();
            String json = sb.toString();
JSONObject jObj = new JSONObject(json);

Android JSON从url检索对象

2 个答案: