huimv.goldpig/huimv-goldpig/huimv-goldpig-admin/src/main/java/com/huimv/common/utils/AirQualityIndexUtil.java

package com.huimv.common.utils;


import net.sf.json.JSONObject;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;

/**
 * @Author Anchor
 * @Date 2021/7/16 10:30
 * @Version 1.0.1
 */
public class AirQualityIndexUtil {



    /**
     * 天气情况查询接口地址
     */
    public static String API_URL = "http://apis.juhe.cn/simpleWeather/query";
    /**
     * 请求key  ---这个key是杨迪自己注册的.免费版.....希望公司后面买正式版
     */
    public static String API_KEY = "b9876f1d1eaec3ae987fcd54646060f7";

    /**
     * 根据城市名查询天气情况
     *
     * @param cityName
     */
    public  static   String  queryWeather(String cityName) {
        //组合参数
        Map<String, Object> params = new HashMap<>();
        params.put("city", cityName);
        params.put("key", API_KEY);
        String queryParams = urlEncode(params);
        String response = doGet(API_URL, queryParams);
        System.out.println(response);
        try {
            JSONObject jsonObject = JSONObject.fromObject(response);
            int errorCode = jsonObject.getInt("error_code");
            if (errorCode == 0) {
                System.out.println("调用接口成功");
                JSONObject result = jsonObject.getJSONObject("result");
                JSONObject realtime = result.getJSONObject("realtime");
               /* System.out.printf("城市：%s%n", result.getString("city"));
                System.out.printf("天气：%s%n", realtime.getString("info"));
                System.out.printf("温度：%s%n", realtime.getString("temperature"));
                System.out.printf("湿度：%s%n", realtime.getString("humidity"));
                System.out.printf("风向：%s%n", realtime.getString("direct"));
                System.out.printf("风力：%s%n", realtime.getString("power"));
                System.out.printf("空气质量：%s%n", realtime.getString("aqi"));
                */
                return    realtime.getString("aqi");
            } else {
                System.out.println("调用接口失败：" + jsonObject.getString("reason"));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return   null;
    }

    /**
     * get方式的http请求
     *
     * @param httpUrl 请求地址
     * @return 返回结果
     */
    public static String doGet(String httpUrl, String queryParams) {
        HttpURLConnection connection = null;
        InputStream inputStream = null;
        BufferedReader bufferedReader = null;
        //返回结果字符串
        String result = null;
        try {
            //创建远程url连接对象
            URL url = new URL(new StringBuffer(httpUrl).append("?").append(queryParams).toString());
            //通过远程url连接对象打开一个连接，强转成httpURLConnection类
            connection = (HttpURLConnection) url.openConnection();
            //设置连接方式：get
            connection.setRequestMethod("GET");
            //设置连接主机服务器的超时时间：5000毫秒
            connection.setConnectTimeout(5000);
            //设置读取远程返回的数据时间：6000毫秒
            connection.setReadTimeout(6000);
            //发送请求
            connection.connect();
            //通过connection连接，获取输入流
            if (connection.getResponseCode() == 200) {
                inputStream = connection.getInputStream();
                //封装输入流，并指定字符集
                bufferedReader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8));
                //存放数据
                StringBuilder sbf = new StringBuilder();
                String temp;
                while ((temp = bufferedReader.readLine()) != null) {
                    sbf.append(temp);
                    sbf.append(System.getProperty("line.separator"));
                }
                result = sbf.toString();
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //关闭资源
            if (null != bufferedReader) {
                try {
                    bufferedReader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != inputStream) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (connection != null) {
                //关闭远程连接
                connection.disconnect();
            }
        }
        return result;
    }

    /**
     * 将map型转为请求参数型
     *
     * @param data
     * @return
     */
    public static String urlEncode(Map<String, ?> data) {
        StringBuilder sb = new StringBuilder();
        for (Map.Entry<String, ?> i : data.entrySet()) {
            try {
                sb.append(i.getKey()).append("=").append(URLEncoder.encode(i.getValue() + "", "UTF-8")).append("&");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
        }
        String result = sb.toString();
        result = result.substring(0, result.lastIndexOf("&"));
        return result;
    }
}