第一步：建立简单的项目

第二步：建一个简单的数据表

第三步：配置文件如下：

pom.xml文件配置：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.wei</groupId>
    <artifactId>demo01</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo01</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.0</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.24</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

application.properties文件配置：


#改变端口号:
server.port=8080
#给整个项目加个前缀,多个项目就不会重复：
#server.servlet.context-path=/first
#school.grade=3
#school.classNum=4

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.password=root
spring.datasource.username=root
spring.datasource.url=jdbc:mysql://localhost:3306/demo?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
spring.thymeleaf.prefix=classpath:/templates/
#mapper.mappers=tk.mybatis.mapper.common.Mapper
#mapper.not-empty=true

项目目录如下：

LoginController.java文件：

注意：@Controller只能用这个，不能用@RestController

package com.wei.demo01.controller;
import com.wei.demo01.entity.UserBean;
import com.wei.demo01.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.annotation.Resource;
@Slf4j
@Controller
public class LoginController {

    //将Service注入Web层
    @Resource
    UserService userService;

    //实现登录
    @RequestMapping("/login")
    public String show(){
        return "login";
    }

    @RequestMapping(value = "/loginIn",method = RequestMethod.POST)
    public String login(String name,String password){
        UserBean userBean = userService.LoginIn(name, password);
        log.info("name:{}",name);
        log.info("password:{}",password);
        if(userBean!=null){
            return "success";
        }else {
            return "error";
        }
    }
    @RequestMapping("/signup")
    public String disp(){
        return "signup";
    }

    //实现注册功能
    @RequestMapping(value = "/register",method = RequestMethod.POST)
    public String signUp(String name,String password){
        userService.Insert(name, password);
        return "success";
    }
}

UserBean.java文件

package com.wei.demo01.entity;

import java.io.Serializable;

public class UserBean implements Serializable {

    private Integer id;
    private String name;
    private String password;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

UserMapper接口文件：

注意：我在这里为偷懒，开始加入了@Mapper注解，目的就是为了不再写mapper映射文件（那个xml写的是真的是太慢了）

package com.wei.demo01.mapper;

import com.wei.demo01.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;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;

@Mapper
public interface UserMapper {
    //查询，可以实现登录功能
    @Select("SELECT * FROM user WHERE name = #{name} AND password = #{password}")
    UserBean getInfo(@Param("name") String name, @Param("password") String password);

    //多个参数要加@Param修饰
    //增加，可以实现注册功能
    @Insert("insert into user(name,password)values(#{name},#{password})")
    void saveInfo(@Param("name") String name, @Param("password") String password);
}

UserService.java文件

package com.wei.demo01.service;

import com.wei.demo01.entity.UserBean;
import com.wei.demo01.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

@Service
public class UserService {
    //将dao层属性注入service层
    @Resource
    private UserMapper userMapper;

    public UserBean LoginIn(String name, String password) {
        return userMapper.getInfo(name,password);
    }

    public void Insert(String name,String password){
        userMapper.saveInfo(name, password);
    }
}

下面都是一些静态html网页：

下面就把所有的代码按顺序依次放在一个框子里面;

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






<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>index</title>
</head>
<body>
<h1>你好啊</h1>
</body>
</html>



<!--登录页面-->

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



<!--注册页面-->
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>注册成功</title>
</head>
<body>
<form role="form" action="/register" method="post">
    请输入姓名:<input type="text" name="name" 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>




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