〇、参考资料

1、hutool介绍

https://blog.csdn.net/abst122/article/details/124091375

2、Spring Boot+Mybatis实现登录注册

https://www.cnblogs.com/wiki918/p/16221758.html

3、Spring Boot读取自定义配置文件

https://www.yisu.com/zixun/366877.html

4、Spring Boot读取properties配置文件的两种方式

https://blog.csdn.net/weixin_42352733/article/details/121830775

一、概述

1、技术栈

Spring Boot+Mybatis+Lombok+Hutool+Slf4j+thymeleaf

2、项目截图

二、登录注册（后台）

1、数据库设计

表结构：

表数据：

建表语句：

CREATE TABLE `user` (
  `id` int NOT NULL AUTO_INCREMENT COMMENT '用户表id',
  `username` varchar(50) NOT NULL COMMENT '用户名',
  `password` varchar(50) NOT NULL COMMENT '用户密码，MD5加密',
  `email` varchar(50) DEFAULT NULL COMMENT '邮箱',
  `phone` varchar(20) DEFAULT NULL COMMENT '手机号',
  `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
  `update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '最后一次更新时间',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=19 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci COMMENT='用户表'

2、POJO（Entity）编写-UserBean.java

package com.boulderaitech.entity;

import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;
import java.util.Date;
@Data //提供了set、get方法及toString
@AllArgsConstructor
@NoArgsConstructor
public class UserBean implements Serializable {
    private Integer id; //为什么用Integer，不用int
    private String username;
    private String password;
    private String email;
    private String phone;
    @JsonFormat(pattern = "yyyy-MM-mm HH:mm:ss")
    private Date create_time;
    @JsonFormat(pattern = "yyyy-MM-mm HH:mm:ss")
    private Date update_time;
}

3、Controller编写-UserController.java

package com.boulderaitech.controller;

import cn.hutool.core.lang.Opt;
import cn.hutool.core.util.StrUtil;
import com.boulderaitech.entity.UserBean;
import com.boulderaitech.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;


@Slf4j
@Controller // 不能用@RestController
public class UserController {
    //将Service注入Web层
    @Autowired
    UserService userService;

    //用户测试
    @RequestMapping("/hello")
    public String hello() {
        return "login";
    }

    @RequestMapping("/register")
    public String register() {
        return "signup";
    }

    @RequestMapping(value = "/login", method = RequestMethod.POST)
    public String login(String username,String password) {
        UserBean userBean = userService.login(username,password);
        log.info("username:{}",username);
        log.info("password:{}",password);
        //hutool-core	核心，包括Bean操作、日期、各种Util等
        if(StrUtil.isNotEmpty(username)) {
            if(userBean != null) {
                return "success";
                //方法引用-遍历集合
                //Opt.ofEmptyAble(userBean).ifPresent(System.out::println);
            }
        } else {
            return "用户名不允许为空";
        }
        return "error";
    }

    @RequestMapping(value = "/signup", method = RequestMethod.POST)
    public String signup(String username,String password) {
        userService.insert(userna