安卓开发之json解析

1、从网页获取json返回字符串

 public class ReadNet extends AsyncTask<URL, Integer, String> {

        @Override

        protected void onPreExecute() {

            super.onPreExecute();

        }

        @Override

        protected String doInBackground(URL... params) {

            StringBuffer sb = new StringBuffer();

            try {

                HttpURLConnection connection = (HttpURLConnection) params[0].openConnection();

                InputStream is = connection.getInputStream();

                BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));

                String readLine;

                while ((readLine = reader.readLine()) != null) {

                    sb.append(readLine);

                    sb.append("\n");

                }

            } catch (IOException e) {

                e.printStackTrace();

            }

            return sb.toString();//得到json

        }

        @Override

        protected void onPostExecute(String s) {

            Document doc = Jsoup.parse(s);

            showArticle.setText(doc.toString());

            super.onPostExecute(s);

        }

    }

2、用JSONObject类和JSONArray类解析json字符串

 JSONObject jsonObject = new JSONObject(jsonString);//{}

 JSONArray jsonArray = new JSONArray（jsonString）;//[{1},{2}]

 JSONObject jsonObject = jsonArray.optJSONObject(1);

 Stirng str=jsonObject.optStirng("name");　

 解析的可以放在list里面,建议都使用JsonObject来解析

 

彩蛋：

　　　　optString和getString的区别:optStirng在得不到想要的结果时返回空，而getString抛出异常

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