通过城市获取天气信息

最近公司新项目首页需要实时获取天气信息，网上查资料研究了一下，通过城市名称获取天气信息。

1、工具类：通过城市名称向中华网年历上获取天气信息，具体代码如下：

package com.troy.emergency.gis.web.rest.util;

import com.troy.emergency.gis.dto.WeatherInfo;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.*;
import java.util.zip.GZIPInputStream;

/**
 * @Author: CaoTing
 * @Description:  通过get请求向中华万年历网站http://wthrcdn.etouch.cn/weather_mini获取某个城市的天气状况数据，数据格式是Json
 * @Date: 2019/7/4
 */
public class WeatherUtils {
    /**
     * 通过城市名称获取该城市的天气信息
     *
     * @param cityName
     * @return
     */

    public  static String getWeatherData(String cityName) {
        StringBuilder sb=new StringBuilder();;
        try {
            cityName = URLEncoder.encode(cityName, "UTF-8");
            String weatherRrl = "http://wthrcdn.etouch.cn/weather_mini?city="+cityName;
//            String weatherRrl = "https://free-api.heweather.net/s6/weather/now?location="+cityName+"&key=db86a5196f304e52a4369818c5182e60";

            URL url = new URL(weatherRrl);
            URLConnection conn = url.openConnection();
            InputStream is = conn.getInputStream();
            GZIPInputStream gzin = new GZIPInputStream(is);

            // 设置读取流的编码格式，自定义编码
            InputStreamReader isr = new InputStreamReader(gzin, "utf-8");
            BufferedReader reader = new BufferedReader(isr);
            String line = null;
            while((line=reader.readLine())!=null) {
                sb.append(line).append(" ");
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return sb.toString();

    }


    /**
     * 将JSON格式数据进行解析 ，返回一个weather对象
     * @param weatherInfoByJson
     * @return
     */
    public static WeatherInfo getWeather(String weatherInfoByJson){
        JSONObject dataOfJson = JSONObject.fromObject(weatherInfoByJson);
        if(dataOfJson.getInt("status")!=1000) {
            return null;
        }

        //创建WeatherInfo对象，提取所需的天气信息
        WeatherInfo weatherInfo = new WeatherInfo();

        //从json数据中提取数据
        String data = dataOfJson.getString("data");

        System.out.println(data);
        dataOfJson = JSONObject.fromObject(data);
        weatherInfo.setCityName(dataOfJson.getString("city"));
        weatherInfo.setGanMao(dataOfJson.optString("ganmao"));
        weatherInfo.setTemperature(dataOfJson.optString("wendu")+"℃");

        //获取预测的天气预报信息
        JSONArray forecast = dataOfJson.getJSONArray("forecast");
        //取得当天的
        JSONObject result=forecast.getJSONObject(0);
        weatherInfo.setDate(result.getString("date"));

        String high = result.getString("high").substring(2);
        String low  = result.getString("low").substring(2);

        weatherInfo.setTemperatureRange(low+"~"+high);
        weatherInfo.setWeather(result.getString("type"));

        return weatherInfo;
    }
}

2、实体类，代码如下：

package com.troy.emergency.gis.dto;

import lombok.Data;

/**
 * @Author: CaoTing
 * @Description: 
 * @Date: 2019/7/4
 */
@Data
public class WeatherInfo {
    /**
     * 时间
     */
    private String date;

    /**
     * 城市名
     */
    private String cityName;

    /**
     * 天气
     */
    private String weather;
    /**
     * 气温
     */
    private String temperatureRange;

    /**
     * 感冒
     */
    private String ganMao;

    /**
     * 当前温度
     */
    private String temperature;


    @Override
    public String toString() {
        return "WeatherInfo [date=" + date + ", cityName=" + cityName
                + ", weather=" + weather + ", temperature=" + temperature+"]";
    }

}

3、测试类，代码如下：

package com.troy.emergency.gis.web.rest.vm;

import com.troy.emergency.gis.web.rest.util.WeatherUtils;


public class test {
    public static void main(String[] args){
        String info = WeatherUtils.getWeatherData("成都");
        System.out.println(WeatherUtils.getWeather(info));
    }
}

4、输入结果，如下图所示：