首先
说一下我们用的api的url，可以直接在浏览器上输入查询，但是会出现乱码问题。
http://wthrcdn.etouch.cn/weather_mini?city=海淀
所以这里我们可以使用线上的测试工具。
https://www.sojson.com/convert/word2spell.html
image.png
注意，这里是get请求UTF-8，输入地址，发送请求就可以查看天气了。
image.png
java代码部分
第一步，加入依赖 (pom文件)
<!--http必要-->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.5</version>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.16</version>
</dependency>
<!--io可选-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-io</artifactId>
<version>1.3.2</version>
</dependency>
<!--jackson可选-->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.8.7</version>
</dependency>
需要http依赖
创建一个maven项目，建立类，main方法，以下是代码部分就可以测试了。
//1.构建客户端
CloseableHttpClient aDefault = HttpClients.createDefault();
//2.请求对象
HttpGet dpGet=new HttpGet("http://wthrcdn.etouch.cn/weather_mini?city=海淀");
//3.发送请求
CloseableHttpResponse closeableHttpResponse = aDefault.execute(dpGet);
//输出内容
//获取对象
String ent = EntityUtils.toString(closeableHttpResponse.getEntity(),"UTF-8");
System.out.println(ent);
输出效果部分
最后的成品代码，需要加入可选部分的依赖，这里主要是解析，让返回值以一种友好的方式呈现。
这里添加的4个类将返回值以一种友好的方式呈现出来。
//Data类字段
Yesterday yesterday;
String city;
List<WeatherInfo> forecast;
String ganmao;
String wendu;
//WeatherForecast类字段
Data data;
String status;
String desc;
//WeatherInfo类字段
String date;
String high;
String fengli;
String low;
String fengxiang;
String type;
//Yesterday类字段
String date;
String high;
String fx;
String low;
String fl;
String type;
以下是代码部分就可以测试了
package com.enjoy.weather.ui;
import com.enjoy.weather.model.WeatherForecast;
import com.enjoy.weather.model.WeatherInfo;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import java.io.IOException;
import java.util.List;
import java.util.Scanner;
/**
* @ClassName WeatherApp
* @Description TODO
* @Author ly
* @Date 2021/3/22 15:23
* @Version 1.0
*/
public class WeatherApp {
public static void main(String[] args) throws IOException {
Scanner scanner = new Scanner(System.in);
System.out.println("请输入：");
String city = scanner.next();
//1.构建客户端
CloseableHttpClient aDefault = HttpClients.createDefault();
//2.请求对象
HttpGet dpGet=new HttpGet("http://wthrcdn.etouch.cn/weather_mini?city="+city);
//3.发送请求
CloseableHttpResponse closeableHttpResponse = aDefault.execute(dpGet);
//输出内容
//获取对象
String ent = EntityUtils.toString(closeableHttpResponse.getEntity(),"UTF-8");
System.out.println(ent);
//解析返回值
ObjectMapper objectMapper = new ObjectMapper();
WeatherForecast weatherForecast = objectMapper.readValue(ent, WeatherForecast.class);
//解析对象的信息 获取城市信息
if(weatherForecast.getStatus().equals("1002")){
System.out.println("您输入的城市不存在");
return;
}
String cityName = weatherForecast.getData().getCity();
System.out.println("所在城市："+cityName);
// 今后5天的天气信息
List<WeatherInfo> forecast = weatherForecast.getData().getForecast();
for (WeatherInfo weatherInfo:forecast){
System.out.println("日期："+weatherInfo.getDate());
System.out.println("天气："+weatherInfo.getType());
System.out.println("最高温度："+weatherInfo.getHigh());
System.out.println("最低温度："+weatherInfo.getLow());
System.out.println("风力："+weatherInfo.getFengli());
System.out.println("风向："+weatherInfo.getFengxiang());
System.out.println("-----------------");
}
}
}
输出效果部分
