<dependency>
            <groupId>com.squareup.okhttp3</groupId>
            <artifactId>okhttp</artifactId>
            <version>3.14.2</version>
        </dependency>

import com.alibaba.fastjson.JSONObject;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import java.io.IOException;
 
 
public class Weather {
 
    public static String getTemp() throws IOException {
        OkHttpClient client = new OkHttpClient().newBuilder()
                .build();
        Request request = new Request.Builder()
                .url("http://d1.weather.com.cn/sk_2d/101120101.html")
                .method("GET", null)
                .addHeader("Referer", "http://www.weather.com.cn/")
                .build();
        Response response = client.newCall(request).execute();
        String body = response.body().string();
        //去除多余字符串
        body = body.substring(body.indexOf('{'));
        JSONObject jsonObject = JSONObject.parseObject(body);
        System.out.println(jsonObject.getString("cityname")+"= " + jsonObject.getString("temp"));
        return jsonObject.getString("temp");
    }
 
 
}

CREATE TABLE `weather` (
  `id` varchar(36) NOT NULL,
  `city_name` varchar(32) DEFAULT NULL COMMENT '城市名稱',
  `city` varchar(32) DEFAULT NULL COMMENT '城市編碼',
  `temp` int(11) DEFAULT NULL COMMENT '溫度',
  `tempf` int(11) DEFAULT NULL COMMENT '華氏度',
  `wd` varchar(32) DEFAULT NULL COMMENT '風向',
  `ws` varchar(32) DEFAULT NULL COMMENT '風力',
  `wse` varchar(32) DEFAULT NULL COMMENT '風速',
  `sd` varchar(32) DEFAULT NULL COMMENT '濕度',
  `date_time` datetime DEFAULT NULL COMMENT '日期時間',
  `weather` varchar(32) DEFAULT NULL COMMENT '天氣',
  `qy` varchar(32) DEFAULT NULL COMMENT '氣壓',
  `njd` varchar(32) DEFAULT NULL COMMENT '能見度',
  `rain` decimal(10,2) DEFAULT NULL COMMENT '降雨量',
  `rain24h` decimal(10,2) DEFAULT NULL COMMENT '降雨量24小時',
  `aqi` int(11) DEFAULT NULL COMMENT '空氣質(zhì)量',
  `limitnumber` varchar(32) DEFAULT NULL COMMENT '限號',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;