项目创建：

如图选择：

第一步：

第二步：依赖选择

总共添加了四个依赖：

项目结构：

DemoController.java

package com.fzf.seckill.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @Author 繁星
 * @Date 2022/10/16 16:53
 * @Function
 */
@RestController
@RequestMapping("/demo")
public class DemoController {

    /**
     * 测试页面跳转
     * @param model
     * @return
     */
    @RequestMapping("/hello")
    public String hello(Model model){

        return "hello";
    }
}

SeckillDemoApplication.java

package com.fzf.seckill;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.fzf.seckill.pojo")
public class SeckillDemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(SeckillDemoApplication.class, args);
    }

}

spring:

  # thymeleaf配置
  thymeleaf:
    # 关闭缓存
    cache: false
  # 数据源配置
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/seckill?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
    username: root
    password: root
    hikari:
      # 连接池名称
      pool-name: DateHikariCP
      #最小空闲连接出
      minimum-idle: 5
      #空闲连接存货最大时间，默认600000（10分钟）
      idle-timeout: 180000
      #最大连接数，默认10
      maximum-pool-size: 10
      #从连接池返回自动提交
      auto-commit: true
      #连接最大存活时间，0表示永久存活，默认1800000（30分支）
      max-lifetime: 1800000
      #连接超时时间，默认30000（30秒）
      connection-timeout: 30000
      #测试连接是否可用的查询语句
      connection-test-query: SELECT 1


#Mybatis-plus配置
mybatis-plus:
  #配置Mapper.xml映射文件
  mapper-locations: classpath*:/mapper/*Mapper.xml
  #配置Mybatis数据返回类型别名（默认别名是类名）
  type-aliases-package: com.fzf.seckill.pojo

# MyBatis SQL打印(方法接口所在的包，不是Mapper.xmL所在的包)
logging:
  level:
    com.fzf.seckill.mapper: debug

pom.xml

<?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>
    <!--SpringBoot-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.fzf</groupId>
    <artifactId>seckill-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>seckill-demo</name>
    <description>seckill-demo</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <!--thymeleaf组件-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <!--web组件-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.0</version>
        </dependency>

        <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!--test组件-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </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>

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Java秒杀系统完整项目实战——逆向工程_最耀眼的那个繁星的博客-CSDN博客