引入依赖

        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.6</version>
        </dependency>

编写工具类

package com.example.miaosha_xdp.util;

import org.apache.commons.codec.digest.DigestUtils;
import org.junit.Test;

/**
 * MD5加密
 */
public class MD5Util {
    /**
     * 盐值  自己定义
     */
    public static final String SALT = "1d3dh43d4";
    /**
     * 加盐加密
     * @param password
     * @return
     */
    public static String inputPassFromPass(String password){
        String str=""+SALT.charAt(0)+SALT.charAt(2)+password+SALT.charAt(6)+SALT.charAt(4);
        return md5(str);
    }
    public static String formPassToDBPass(String formPass, String salt) {
        String str = ""+salt.charAt(0)+salt.charAt(2) + formPass +salt.charAt(5) + salt.charAt(4);
        return md5(str);
    }


    /**
     * 加密
     * @param password
     * @return
     */
    public static String md5(String password) {
        return DigestUtils.md5Hex(password);

    }
    @Test
    public void demo(){
        System.out.println(inputPassFromPass("123456"));
    }
}