java - Android - 从 JSON 字符串转换为 Java 对象

Question

我有 Android 应用程序连接到 MySQL 数据库，连接一切正常，但从数据库检索的数据采用 JSON 格式，我使用此类进行连接:

public class CommunicatetoServer extends AsyncTask<String, Void, String> {


    @Override
    protected String doInBackground(String... params) {
        String response = "";

        String url = params[0];
        // Making HTTP request
        try {
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpGet httpPost = new HttpGet(url);

            HttpResponse getResponse = httpClient.execute(httpPost);
            final int statusCode = getResponse.getStatusLine().getStatusCode();

            if (statusCode != HttpStatus.SC_OK) {
                Log.w(getClass().getSimpleName(),
                        "Error " + statusCode + " for URL " + url);
                return null;
            }

            HttpEntity getResponseEntity = getResponse.getEntity();

            is = getResponseEntity.getContent();

            BufferedReader buffer = new BufferedReader(new InputStreamReader(is));
            String s = "";
            while ((s = buffer.readLine()) != null) {
                response += s;
            }

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            Log.d("IO", e.getMessage().toString());
            e.printStackTrace();

        }


        // return JSON String
        return response;

    }

    protected void onPostExecute(String response)
    {
        //onPostExecute
        Log.d("Server Response : ", response.toString());
        Toast.makeText(context, response.toString(), Toast.LENGTH_LONG).show();
    }

}

我这样应用它:

private void GetComments() {
    new CommunicatetoServer().execute(SERVER_URL + "GetComments.php");
}

上面的方法是从数据库中取出所有的评论信息，是这样的(数据仅供测试):

[{"Uname":"test1","Id":"1","DateTime":"2015-03-04 00:00:00","comment":"Hello"},{"Uname":"test3","Id":"1","DateTime":"2015-02-04 10:23:42","comment":"asdffgsdg asdf"}]

那么如何将其转换为java对象呢？

谢谢。

Answer 1

如果你想获得一个可以返回子对象等的 JSONObject，你可以使用 JSON-Simple 库:

JSONObject obj = (JSONObject) new JSONParser().parse(jsonString);