<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.3.9</version>
</dependency>

package com.mouday;

import cn.hutool.core.date.DateUtil;
import cn.hutool.core.io.file.FileReader;
import cn.hutool.core.io.file.FileWriter;
import cn.hutool.crypto.digest.DigestUtil;
import cn.hutool.http.HttpUtil;


public class Demo {
    public static void main(String[] args)  {
        // 时间获取
        System.out.println(DateUtil.now());
        //2020-07-22 09:15:53

        // 文件读写
        FileWriter writer = new FileWriter("name.txt");
        writer.write("hello");

        FileReader reader = new FileReader("name.txt");
        System.out.println(reader.readString());

        // hash
        String md5Hex = DigestUtil.md5Hex("hello");
        System.out.println(md5Hex);
        // 5d41402abc4b2a76b9719d911017c592

        // get请求
        String result1= HttpUtil.get("https://www.baidu.com");
        System.out.println(result1);

    }
}