求java通过http请求获取json数据的demo

package com.binjava.test;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

public class MainFrame{

public static void main(String[] args) {
    HttpURLConnection connection = null;
    InputStream is = null;
    BufferedReader br = null;
    String result = null;
    try {
        URL url = new URL("http://www.yemaxgo.com/connect.php");
        connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");
        connection.setConnectTimeout(15000);
        connection.setReadTimeout(60000);
        connection.connect();
        if (connection.getResponseCode() == 200) {
            is = connection.getInputStream();
            br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
            StringBuffer sbf = new StringBuffer();
            String temp = null;
            while ((temp = br.readLine()) != null) {
                sbf.append(temp);
                sbf.append("\r\n");
            }
            result = sbf.toString();
            result = "{1:"+result+"}";//不是严格的JSON数据格式，补成标准的json数据格式
            JsonParser jParser = new JsonParser();
            JsonObject jt = (JsonObject) jParser.parse(result);
            JsonArray jArray = jt.get("1").getAsJsonArray();
            JsonObject subObject=jArray.get(0).getAsJsonObject();
            System.out.println("id值为:"+subObject.get("id").getAsInt());
            System.out.println("speed值为:"+subObject.get("speed").getAsInt());
            System.out.println("pm25为:"+subObject.get("pm25").getAsInt());
            System.out.println("temperature(温度)为:"+subObject.get("temperature").getAsInt());
            System.out.println("humidity值为:"+subObject.get("humidity").getAsInt());
            System.out.println("temperature_warning值为:"+subObject.get("temperature_warning").getAsInt());
            System.out.println("gas_warning值为:"+subObject.get("gas_warning").getAsInt());
            System.out.println("humidity_warning值为:"+subObject.get("humidity_warning").getAsInt());
            System.out.println("lowpower_warning值为:"+subObject.get("lowpower_warning").getAsInt());
            System.out.println("mode值为:"+subObject.get("mode").getAsInt());
            System.out.println("timing_hour值为:"+subObject.get("timing_hour").getAsInt());
            System.out.println("timing_minute值为:"+subObject.get("timing_minute").getAsInt());
            System.out.println("timing_second值为:"+subObject.get("timing_second").getAsInt());
            System.out.println("update_time值为:"+subObject.get("update_time").getAsString());
            subObject=jArray.get(1).getAsJsonObject();
            System.out.println("time值为:"+subObject.get("time").getAsString());          
        }
    }catch (Exception e) {
        // TODO: handle exception
        e.printStackTrace();
    }

}
}