18.天气小案例

1►新增带Layout组件的页面

直接在views文件夹下面新增weather.vue。然后随便写一个123，现在先让我们页面能跳过去先。

让页面能跳过去，有好几种方法：

1、在菜单管理自己添加一个菜单，然后把菜单分配给某个角色，再把该角色分给某个人。【然而超级管理员什么时候都能看到此菜单，因为超级管理员能无视一切权限问题】

2、在路由文件（router/index.js直接写相关路由），然后可以手动切换浏览器网址进入该路由。

本次例子利用使用自己添加菜单的方法，这样比较简单。简单如下图：

组件地址：默认是views目录下面的文件

路由地址：点击这个功能访问的url

意思就是点击这个路由地址可以进入这个组件

组件路径一定要写对，写不对直接进不去相应的组件。路由地址可以乱写，但是起码也要有点“path”的样子吧？

先随便在weather.vue写一句话来测试一下：

 发现页面也出来了：

现在我们可以开始专注页面了。 

2►专注weather业务

首先.vue文件的代码如下：

<template>
  <div v-loading="loading">
    <el-row style="margin-top: 30px;" :gutter="20">
      <el-col :offset="10" :span="4">
        <el-button type="success" @click="handleWeather">当前城市天气</el-button>
      </el-col>
    </el-row>
    <el-row :gutter="20" v-if="city.length>0">
      <el-col :offset="2" :span="20">
        <el-descriptions title="当前实时天气">
          <el-descriptions-item label="当前城市">{{ city }}</el-descriptions-item>
          <el-descriptions-item label="温度">{{ weather.realtime.temperature }}℃</el-descriptions-item>
          <el-descriptions-item label="风向">{{ weather.realtime.direct }}</el-descriptions-item>
          <el-descriptions-item label="风力">{{ weather.realtime.power }}</el-descriptions-item>
          <el-descriptions-item label="湿度">{{ weather.realtime.humidity }}%</el-descriptions-item>
          <el-descriptions-item label="天气状况">{{ weather.realtime.info }}</el-descriptions-item>
        </el-descriptions>
      </el-col>
    </el-row>
    <el-row v-for="item in weather.future" :key="item.date" style="margin-top: 30px;" :gutter="20">
      <el-col :offset="2" :span="20">
        <el-descriptions :title="item.date" :column="4">
          <el-descriptions-item label="风向">{{ item.direct }}</el-descriptions-item>
          <el-descriptions-item label="温度">{{ item.temperature }}</el-descriptions-item>
          <el-descriptions-item label="天气情况">{{ item.weather }}</el-descriptions-item>
        </el-descriptions>
      </el-col>
    </el-row>
  </div>
</template>

<script>
import {getWeather} from "@/api/gzh/weather";

export default {
  name: "weather",
  data() {
    return {
      loading:false,
      city: "",
      weather: {
        realtime: {},
        future: []
      }
    }
  },
  methods: {
    handleWeather() {
      this.loading=true;
      getWeather().then(res => {
        const weatherInfo = JSON.parse(res.msg);
        this.city = weatherInfo.result.city
        this.weather.realtime = weatherInfo.result.realtime
        this.weather.future = weatherInfo.result.future
        console.log(weatherInfo)
      this.loading=flase;
      }).catch(err => {
        console.error(err)
      })
    }
  }
}
</script>

<style scoped>

</style>

然后是前端api调用代码：

import request from "@/utils/request";
// 查询参数列表export function getWeather() {  return request({    url: '/getWeatherByLocalIP',    method: 'get',  })}

接下来是后端的工具类代码：

package com.ruoyi.web.controller.gzh;

import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.utils.http.HttpUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

@RestController
public class WeatherController {

    @GetMapping("/getWeatherByLocalIP")
    public AjaxResult getWeather() throws UnsupportedEncodingException {
        AjaxResult result = AjaxResult.success();
        String localCityName = GetLocationAndIP.getLocalCityName();
        //调用天气API
        String encodeCity = URLEncoder.encode(localCityName, "UTF-8");
        System.out.println(encodeCity);
        String url = "http://apis.juhe.cn/simpleWeather/query?city=" + encodeCity + "&key=81fe33a6077267b2e4ae2967af47eeb7";
        String weatherInfo = HttpUtils.sendGet(url);
        result.put("msg", weatherInfo);
        return result;
    }

}

然后是后端接口的代码：

package com.ruoyi.web.controller.gzh;


import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class GetLocationAndIP {


    private static String readAll(BufferedReader rd) throws IOException {
        StringBuilder sb = new StringBuilder();
        int cp;
        while ((cp = rd.read()) != -1) {
            sb.append((char) cp);
        }
        return sb.toString();
    }


    public static JSONObject readJsonFromUrl(String url) throws IOException, JSONException {
        try (InputStream is = new URL(url).openStream()) {
            BufferedReader rd = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8));
            String jsonText = readAll(rd);
            return new JSONObject(jsonText);
        }
    }

    public Map<String, Object> getAddress() {
        String ip = "";
        // 这个网址似乎不能了用了
        // String chinaz = "http://ip.chinaz.com";
        // 改用了太平洋的一个网址
        String chinaz = "http://whois.pconline.com.cn/";

        StringBuilder inputLine = new StringBuilder();
        String read = "";
        URL url = null;
        HttpURLConnection urlConnection = null;
        BufferedReader in = null;

        Map<String, Object> map = new HashMap<>();
        try {
            url = new URL(chinaz);
            urlConnection = (HttpURLConnection) url.openConnection();
            // 如有乱码的，请修改相应的编码集，这里是 gbk
            in = new BufferedReader(new InputStreamReader(urlConnection.getInputStream(), "gbk"));
            while ((read = in.readLine()) != null) {
                inputLine.append(read).append("\r\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        // 这个是之前的正则表达式,
        // Pattern p = Pattern.compile("\\<dd class\\=\"fz24\">(.*?)\\<\\/dd>");
        // 通过正则表达式匹配我们想要的内容，根据拉取的网页内容不同，正则表达式作相应的改变
        Pattern p = Pattern.compile("显示IP地址为(.*?)的位置信息");
        Matcher m = p.matcher(inputLine.toString());
        if (m.find()) {
            String ipstr = m.group(0);
            // 这里根据具体情况，来截取想要的内容
            ip = ipstr.substring(ipstr.indexOf("为") + 2, ipstr.indexOf("的") - 1);
            map.put("ip", ip);
        }
        JSONObject json = null;
        try {
            // 这里调用百度的ip定位api服务 详见 http://api.map.baidu.com/lbsapi/cloud/ip-location-api.htm
            json = readJsonFromUrl("http://api.map.baidu.com/location/ip?ak=laOQElaF53xGGBjscGtrd10nN4j1zGki&ip=" + ip);
            //city = (((JSONObject) ((JSONObject) json.get("content")).get("address_detail")).get("city")).toString();
            map.put("city", ((JSONObject) ((JSONObject) json.get("content")).get("address_detail")).get("city").toString());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return map;
    }

    public static String getLocalCityName() {
        GetLocationAndIP getLocationANDIp = new GetLocationAndIP();
        Map<String, Object> map = getLocationANDIp.getAddress();
        String city = map.get("city").toString();
        return city.substring(0, city.length() - 1);
    }

    public static void main(String[] args) {
        GetLocationAndIP getLocationANDIp = new GetLocationAndIP();
        Map<String, Object> map = getLocationANDIp.getAddress();
        String city = map.get("city").toString();
        String city_1 = city.substring(0, city.length() - 1);
        System.out.println(city_1);
    }
}

补充依赖

<dependency>
    <groupId>org.json</groupId>
    <artifactId>json</artifactId>
    <version>20090211</version>
</dependency>

由此，天气小demo就跑起来了，效果图如下：