来源：blog.csdn.net/caoxiaohong1005

Just Code It

一、搭建SpringBoot项目

1.1、file ——> new ——> project——> Spring Initializr——> next——> next——> next——> finish

注意选择包依赖关系
Web下的Spring Web。
Template Engines下的Thymeleaf。
SQL下的JDBC API、Spring Data JDBC、MySQL Driver。

二、springboot整合mybatis.mysql

2.1、整体结构

2.2、设置所需要的依赖

即pom.xml文件

<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>4.0.0modelVersion>    <parent>        <groupId>org.springframework.bootgroupId>        <artifactId>spring-boot-starter-parentartifactId>        <version>2.4.2version>        <relativePath/>     parent>    <groupId>springboot-web04groupId>    <artifactId>demoartifactId>    <version>0.0.1-SNAPSHOTversion>    <name>demoname>    <description>Demo project for Spring Bootdescription>    <properties>        <java.version>1.8java.version>    properties>    <dependencies>        <dependency>            <groupId>org.springframework.bootgroupId>            <artifactId>spring-boot-starter-data-jdbcartifactId>        dependency>        <dependency>            <groupId>org.springframework.bootgroupId>            <artifactId>spring-boot-starter-jdbcartifactId>        dependency>        <dependency>            <groupId>org.springframework.bootgroupId>            <artifactId>spring-boot-starter-thymeleafartifactId>        dependency>        <dependency>            <groupId>org.springframework.bootgroupId>            <artifactId>spring-boot-starter-webartifactId>        dependency>
        <dependency>            <groupId>mysqlgroupId>            <artifactId>mysql-connector-javaartifactId>            <scope>runtimescope>        dependency>        <dependency>            <groupId>org.springframework.bootgroupId>            <artifactId>spring-boot-starter-testartifactId>            <scope>testscope>        dependency>            <dependency>                <groupId>org.springframework.bootgroupId>                <artifactId>spring-boot-starter-jdbcartifactId>            dependency>            <dependency>                <groupId>org.springframework.bootgroupId>                <artifactId>spring-boot-starter-thymeleafartifactId>            dependency>            <dependency>                <groupId>org.springframework.bootgroupId>                <artifactId>spring-boot-starter-webartifactId>            dependency>
            <dependency>                <groupId>org.mybatis.spring.bootgroupId>                <artifactId>mybatis-spring-boot-starterartifactId>                <version>2.1.3version>            dependency>
            <dependency>                <groupId>mysqlgroupId>                <artifactId>mysql-connector-javaartifactId>            dependency>
            <dependency>                <groupId>org.projectlombokgroupId>                <artifactId>lombokartifactId>                <version>1.18.12version>                <scope>providedscope>            dependency>
            <dependency>                <groupId>com.alibabagroupId>                <artifactId>druidartifactId>                <version>1.2.1version>            dependency>
            <dependency>                <groupId>org.springframework.bootgroupId>                <artifactId>spring-boot-starter-testartifactId>                <scope>testscope>                <exclusions>                    <exclusion>                        <groupId>org.junit.vintagegroupId>                        <artifactId>junit-vintage-engineartifactId>                    exclusion>                exclusions>            dependency>            <dependency>                <groupId>org.xmlunitgroupId>                <artifactId>xmlunit-coreartifactId>            dependency>            <dependency>                <groupId>org.mybatisgroupId>                <artifactId>mybatisartifactId>                <version>3.4.6version>            dependency>    dependencies>
    <build>        <plugins>            <plugin>                <groupId>org.springframework.bootgroupId>                <artifactId>spring-boot-maven-pluginartifactId>            plugin>        plugins>    build>
project>

2.3、设置application.yml文件与pplication.properties文件

在resources目录下新建yml文件，用于存放数据库连接需要的一些数据

spring:  datasource:    driver-class-name: com.mysql.cj.jdbc.Driver    url: jdbc:mysql://localhost:3306/mybatis?serverTimezone=GMT%2B8&useSSL=true    username: root   #数据库    password: sm1208 #密码

在application.properties文件中加入

#端口号server.port=8080#druid数据库连接池type=com.alibaba.druid.pool.DruidDataSource#清除缓存spring.thymeleaf.cache=false#配置mappermybatis.mapper-locations=classpath:mapper/*.xml

2.4、在pojo下的新建类UserLogin

package springbootweb04.demo.pojo;
import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;
@Data@AllArgsConstructor@NoArgsConstructor
public class UserLogin {    private String username;    private String password;
    public String getUsername() {        return username;    }}

2.5、新建数据库，名为mybatis，创建用户表，名为userLogin，创建username、password字段

2.5.1、数据库名可以随意，不过要与application.yml文件中的一致

2.5.2、IDEA中连接数据库

Database——> +——> Data Source——> Mysql

2.6、mapper层

新建UserLoginMapper接口

package springbootweb04.demo.mapper;
import org.apache.ibatis.annotations.Mapper;import org.springframework.stereotype.Repository;import springbootweb04.demo.pojo.UserLogin;
import java.util.List;
@Mapper@Repositorypublic interface UserLoginMapper {    //查询    public List queryAll();    //添加数据    public int add(UserLogin userLogin);    //根据用户名查询数据    public UserLogin queryByName(String username);}

2.7、resources目录下的mapper目录

在resources目录下新建mapper目录，并在这个目录下新建UserLoginMapper.xml文件

        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"        "http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="springbootweb04.demo.mapper.UserLoginMapper">    <select id="queryAll" resultType="springbootweb04.demo.pojo.UserLogin">        select * from userLogin    select>
    <insert id="add" parameterType="springbootweb04.demo.pojo.UserLogin">        insert into userLogin values (#{username},#{password})    insert>
    <select id="queryByName" resultType="springbootweb04.demo.pojo.UserLogin">        select * from userLogin where username = #{username}    select>
mapper>

2.8、测试

在test.Java.springbootweb04.demo类中，测试是否能联通数据库，没有报错说明成功。

package springbootweb04.demo;
import org.junit.jupiter.api.Test;import org.springframework.boot.test.context.SpringBootTest;import springbootweb04.demo.mapper.UserLoginMapper;import springbootweb04.demo.pojo.UserLogin;import org.springframework.beans.factory.annotation.Autowired;

import javax.sql.DataSource;import java.sql.Connection;import java.sql.SQLException;import java.util.List;
@SpringBootTestclass DemoApplicationTests {    @Autowired    DataSource dataSource;    @Test    void contextLoads() throws SQLException {        System.out.println(dataSource.getClass());        Connection connection = dataSource.getConnection();        System.out.println(connection);
        //template模板，拿来即用        connection.close();    }    @Autowired    UserLoginMapper userLoginMapper;    @Test    public void toTest(){        List<UserLogin> userLogins = userLoginMapper.queryAll();        userLogins.forEach(e-> System.out.println(e));    }}

2.9、services层

在services下新建接口UserLoginServicesI和类UserLoginServicesImpl

UserLoginServicesI接口：

package springbootweb04.demo.services;
import springbootweb04.demo.pojo.UserLogin;
import java.util.List;
public interface UserLoginServicesI {    //查询    public List queryAll();    //添加数据    public int add(UserLogin userLogin);    //根据用户名查询数据    public UserLogin queryByName(String username);}

UserLoginServicesImpl类

package springbootweb04.demo.services;
import springbootweb04.demo.mapper.UserLoginMapper;import springbootweb04.demo.pojo.UserLogin;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;
import java.util.List;
@Servicepublic class UserLoginServicesImpl implements UserLoginServicesI {
    @Autowired    UserLoginMapper userLoginMapper;    @Override    public List queryAll() {        return userLoginMapper.queryAll();    }
    @Override    public int add(UserLogin userLogin) {        return userLoginMapper.add(userLogin);    }
    @Override    public UserLogin queryByName(String username) {        return userLoginMapper.queryByName(username);    }}

2.A、controller层

编写MyController类

package springbootweb04.demo.controller;
import springbootweb04.demo.pojo.UserLogin;import springbootweb04.demo.services.UserLoginServicesImpl;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.RequestMapping;
@Controllerpublic class MyController {    @Autowired    UserLoginServicesImpl userLoginServicesImpl;
    @RequestMapping("/toLogin")    public String toLogin(){        return "login";    }
    @RequestMapping("/LoginSuccess")    public String LoginSuccess(Model model, UserLogin userLogin){        //先查询看该用户名是否存在        UserLogin userLogin1 = userLoginServicesImpl.queryByName(userLogin.getUsername());        if(userLogin1 != null){ //  如果查询的用户不为空            System.out.println(userLogin1.toString());            return "success";        }        else{            //返回到登录页面            model.addAttribute("data","该用户不存在，请先注册");            return "login";        }    }    //登录界面    @RequestMapping("/toRegister")    public String toRegister(){        return "register";    }    @RequestMapping("/RegisterSuccess")    public String toRegisterSuccess(Model model,UserLogin userLogin){        //将账号密码加入到数据库中        int add = userLoginServicesImpl.add(userLogin);        System.out.println("数据插入成功！");        model.addAttribute("data","注册成功，请登录！");        return "login";    }}

三、编写前端页面

将以下三个页面放在templates下面

<html lang="en" xmlns:th="http://www.thymeleaf.org"><head>    <meta charset="UTF-8">    <title>Titletitle>head><body style="background: aqua"><div align="center">    <br><br><h2>登录界面h2><br><br>    <span th:text="${data}" style="text-color:red;font-size: 10px">span>    <form method="get" action="/LoginSuccess">        用户名:<input type="text" name="username" placeholder="请输入用户名" required/><br><br>        密码：<input type="text" name="password" placeholder="请输入密码" required/><br><br>        <input type="submit" value="登录">    form>    <br>    <form method="get" action="/toRegister">        <input type="submit" value="注册">    form>div>body>html>

<html lang="en" xmlns:th="http://www.thymeleaf.org"><head>    <meta charset="UTF-8">    <title>Titletitle>head><body style="background: aqua"><div align="center">    <br><br>注册界面<br><br>    <form method="get" action="/RegisterSuccess">        用户名:<input type="text" name="username" placeholder="请输入用户名" required/><br><br>        密码：<input type="text" name="password" placeholder="请输入密码" required/><br><br>        确认密码：<input type="text" name="password2" placeholder="请输入密码" required/><br><br>        <input type="submit" value="注册">    form>div>body>html>

success.html：成功界面

<html lang="en"><head>    <meta charset="UTF-8">    <title>Titletitle>head><body>
body>html>

四、运行测试

:localhost:8080/toLogin

框架实现动态登录与注册功能

PS：如果觉得我的分享不错，欢迎大家随手点赞、在看。

END

IDEA下创建SpringBoot+MyBatis+MySql项目实现动态登录与注册功能