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(username,password);
        return "success";
    }
}

4、Service编写-UserService.java

package com.boulderaitech.service;

import com.boulderaitech.entity.UserBean;
import com.boulderaitech.mapper.UserMapper;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
@Service
public class UserService {
    //将dao层属性注入service层，为什么不用Autowired
    @Resource
    private UserMapper userMapper;

    public UserBean login(String username, String password) {
        return userMapper.getInfo(username,password);
    }

    public void insert(String username, String password) {
        userMapper.saveUser(username,password);
    }
}

5、Mapper编写-UserMapper.java

package com.boulderaitech.mapper;

import com.boulderaitech.entity.UserBean;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

@Mapper //添加Mapper注解，就不用写xml的mapper映射文件了
public interface UserMapper {
    //多个参数要加@Param修饰
    //思考：xml中的<include>代码片段怎么配
    @Select("SELECT * FROM user WHERE username=#{username} AND password= #{password}")
    UserBean getInfo(@Param("username") String username,@Param("password") String password);

    @Insert("INSERT INTO user(username,password) VALUE(#{username},#{password})")
    void saveUser(@Param("username") String username,@Param("password") String password);
}

6、配置文件编写-application.properties

# Spring Boot端口号
server.port=9088
# 数据源配置
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.password=qaz123
spring.datasource.username=root
spring.datasource.url=jdbc:mysql://192.168.40.111:3306/visualization?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
spring.thymeleaf.prefix=classpath:/templates/

7、启动类编写-KettleProcessorApplication.java

package com.boulderaitech;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * Spring Boot启动类，加Spring Boot注解，调用Spring的静态run方法
 */
@SpringBootApplication
public class KettleProcessorApplication {
    public static void main(String[] args) {
        SpringApplication.run(KettleProcessorApplication.class);
    }
}

三、登录注册（前台）

1、登录页面-login.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>login</title>
</head>
<body>
<form role="form" action = "/login" method="post">
  账号：<input type="text" id="username" name = "username"> <br>
  密码：<input type="password" id = "password" name = "password"> <br>
  <input type="submit" id = "login" value = "登录">
</form>
<a href="/register">注册</a>
</body>
</html>

2、注册页面-signup.html

<!--注册页面-->
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>注册</title>
</head>
<body>
<form role="form" action="/signup" method="post">
    请输入姓名:<input type="text" name="username" id="name"><br>
    请输入密码：<input type="password" name="password" id="password"><br>
    <input type="submit" name="sign" value="提交">
</form>
</body>
</html>

3、成功页面-success.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>success</title>
</head>
<body>
<h1>欢迎，恭喜登录成功/注册成功</h1>
</body>
</html>

4、失败页面-error.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>error</title>
</head>
<body>
<h1>登录失败！</h1>
</body>
</html>

四、配置读取

1、配置编写-kettle.properties

# 读取properties的两种方式：https://blog.csdn.net/weixin_42352733/article/details/121830775
environment=xuelei-www
kettle.repository.type=database
kettle.repository.username=admin
kettle.repository.password=admin

2、POJO（Entity）编写-KettleRepositoryBean.java

package com.boulderaitech.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
@Data
@Component
@NoArgsConstructor
@AllArgsConstructor
@ConfigurationProperties(prefix = "kettle.repository")
public class KettleRepositoryBean {
    private String type;
    private String username;
    private String password;
}

3、Controller编写-PropertiesController.java

package com.boulderaitech.controller;

import com.boulderaitech.entity.KettleRepositoryBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController //Controller和RestCOntroller的区别
@PropertySource("classpath:kettle.properties") //默认是application.properties
public class PropertiesController {
    @Value("${environment}")
    private String envName;

    @Autowired
    private KettleRepositoryBean kettleRepositoryBean;

    @RequestMapping("/getEnv")
    public String getEnv() {
        return "hello " + envName;
    }

    @RequestMapping("/getRepoInfo")
    public String getRepoInfo() {
        return "hello " + kettleRepositoryBean.toString();
    }
}

五、验证

1、登录

2、注册

3、读取单个配置

4、读取实体类配置（多个）