Java通过经纬度、IP、城市调用天气接口（YY天气）

调用接口，首先得去注册一个账号，（它只能获取当天的数据，没有百度API的功能强大）

官网参考：http://www.yytianqi.com/api.html

package com.common.filo;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class weatherApi {

    public static void main(String[] args) {
        //31.874000,101.110880,3362.300
        String weidu = "101.110880";
        String jindu = "31.874000";

        String weatherData = getWeatherData(weidu,jindu);
        List getWeather = GetWeather(weatherData);
        for (Object object : getWeather) {
            System.out.println(object.toString());
        }


    }
    /**
     * 根据经纬度获取城市的气温信息
     * @param weidu 纬度
     * @param jindu 经度
     * @return
     */
    public static String getWeatherData(String weidu,String jindu) {
        StringBuilder sb = new StringBuilder();
        //http://api.yytianqi.com/weatherhours?key=xxxx&city=31.874000,101.110880"
        try {
            String weather_url = "http://api.yytianqi.com/weatherhours?key=bopi3li1ip93ae0n&city="+weidu+","+jindu+"";
            URL url = new URL(weather_url);
            URLConnection conn = url.openConnection();
            InputStream inputStream = conn.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream,"utf-8");
            BufferedReader reader = new BufferedReader(inputStreamReader);
            String line = null;
            while((line=reader.readLine())!=null) {
                sb.append(line+" ");
            }
            reader.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return sb.toString();
    }

    /**
     * 对调用天气API的数据进行json序列化
     * @param weatherJson
     * @return
     */
    public static List<String> GetWeather(String weatherJson) {
        //城市名
        String cityname= "";
        //获取当时的气温
        String qw = "";
        List<String> list = new ArrayList<String>();
        JSONObject dataJson = JSONObject.fromObject(weatherJson.trim());
        String getCode = dataJson.getString("msg");
        //如果没有获取到信息，则返回未知
        if(getCode.equals("Error")) {
            cityname = "未知";
            qw = "未知";
            list.add(cityname);
            list.add(qw);
            return list;
        }else {
            String data = dataJson.getString("data");
            dataJson = JSONObject.fromObject(data);
            cityname = dataJson.getString("cityName");
            JSONArray qwlist = dataJson.getJSONArray("list");
            JSONObject result = qwlist.getJSONObject(0);
            qw = result.getString("qw");
            qw = qw+"℃";
            list.add(cityname);
            list.add(qw);
        }
            return list;
    } 
}

返回结果为JSON格式

{
    "code": 1,
    "msg": "Sucess",
    "counts": 2362,  //访问的剩余次数。
    "data": {
        "cityId": "CH010100",  //城市id
        "cityName": "北京",  //城市名称
        "lastUpdate": "2016-03-09 17:10:00",  //实况更新时间
        "tq": "多云",  //天气现象
        "numtq": "01",  //天气现象编码
        "qw": "5.0",  //当前气温
        "fl": "微风",  //当前风力
        "numfl": "0",  //当前风力编码
        "fx": "无持续风向",  //当前风向
        "numfx": "0",  //当前风向编码
        "sd": "10.0"  //相对湿度，直接在此数值后添加%即可
    }
}