通过URL获取JSON解析详解

//GET方法

URL url = new URL(
                            "http://japi.juhe.cn/joke/content/list.from?sort=desc&page=" + count + "&pagesize=20&time="
                                    + (System.currentTimeMillis() / 1000) + "&key=6a9e56852fa248b7ebb80d1e35e02***");

                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                    conn.setRequestMethod("GET");
                    conn.connect();
                    BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                    String text = null;
                    StringBuffer sb = new StringBuffer();
                    while ((text=br.readLine())!=null) {
                        sb.append(text);
                    }

                    //拿到结果  sb.toString();
                    JSONObject json = new JSONObject(sb.toString());
                    json = json.getJSONObject("result");
                    JSONArray array = json.getJSONArray("data");
                    for (int i = 0; i < array.length(); i++) {
                        JSONObject obj = array.getJSONObject(i);
                        String str = obj.getString("content");
                        datas.add(str);
                    }

//POST方法

URL url = new URL("http://op.juhe.cn/onebox/weather/query");
                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                    String par = "cityname=昌平&key=633a2171bde0bf871680e74f14557***";
                    /**
                     * Connection : 默认是开启输入流的 ,关闭输出流
                     *  开启输出流 ,一般使用POST请求上传数据时 , 设置
                     */
                    conn.setDoOutput(true);
                    //设置请求方式POST
                    conn.setRequestMethod("POST");
                    //开始连接
                    conn.connect();
                    //获取指向服务器的输出流
                    OutputStream os = conn.getOutputStream();
                    //将输出流转换成打印流
                    PrintWriter pw = new PrintWriter(os);
                    //向服务器传递数据
                    pw.println(par);
                    //刷新一下
                    pw.flush();     

                    BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                    String text = null;
                    StringBuffer sb = new StringBuffer();
                    while ((text=br.readLine())!=null) {
                        sb.append(text);
                    }

                    //拿到结果  sb.toString();
                    JSONObject json = new JSONObject(sb.toString());
                    json = json.getJSONObject("result");
                    json = json.getJSONObject("data");
                    JSONArray arr = json.getJSONArray("weather");

                    for (int i = 0; i < arr.length(); i++) {
                        JSONObject obj = arr.getJSONObject(i);
                        String date = obj.getString("date");
                        obj = obj.getJSONObject("info");
                        JSONArray array = obj.getJSONArray("day");
                        String weather = "天气:"+array.getString(1)+",温度:"+array.getString(2);
                        datas.add(date+"\n\r\t\t"+weather);

                    }