springboot分层项目(controller,mapper,service)

    4.0.0
    com.example
    Untitled01
    0.0.1-SNAPSHOT
    Untitled01
    Untitled01

    
        1.8
        UTF-8
        UTF-8
        2.3.7.RELEASE
    

    
        
        
            org.springframework.boot
            spring-boot-starter
        
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.5.1
        
        
        
            mysql
            mysql-connector-java
        
        
        
            org.projectlombok
            lombok
        
        
        
            org.slf4j
            slf4j-api
            1.7.21
        
        
            org.slf4j
            slf4j-log4j12
            1.7.21
        
    

    
        
            
                org.springframework.boot
                spring-boot-dependencies
                ${spring-boot.version}
                pom
                import
            
        
    

    
        
            
                org.apache.maven.plugins
                maven-compiler-plugin
                3.8.1
                
                    1.8
                    1.8
                    UTF-8
                
            
            
                org.springframework.boot
                spring-boot-maven-plugin
                2.3.7.RELEASE
                
                    com.example.Application
                
                
                    
                        repackage
                        
                            repackage
                        
                    
                
            
        
    

server:
  port: 8086 # 启动端口

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver # 数据库驱动
    username: root 
    password: 123456
    url: jdbc:mysql://localhost:3306/sell?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
  application:
    name: Untitled01
mybatis-plus:
  mapper-locations: classpath*:mapper/*.xml #自动扫描mapper下的xml
  global-config:
    db-config:
      table-prefix: t_ #表浅醉

CREATE TABLE IF NOT Exists tb_user
(
    id       INT(20)     NOT NULL COMMENT '主键id',
    user_name VARCHAr(30) NULL DEFAULT NULL COMMENT '姓名',
    age      INT(11)     NULL DEFAULT NULL COMMENT '年龄',
    email    VARCHAr(50) NULL DEFAULT NULL COMMENT '邮箱',
    PRIMARY KEY (id)
);
replace into tb_user(id, user_name, age, email)
values (1, 'Jone', 18, 'test1@qq.com'),
       (2, 'Jone', 22, 'test2@qq.com'),
       (3, 'Jone', 23, 'test3@qq.com'),
       (4, 'Jone', 12, 'test4@qq.com'),
       (5, 'Jone', 34, 'test5@qq.com');

Application.java

package com.example;

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

@SpringBootApplication
@MapperScan("com.example.mapper")
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

}

UserMapper.java

package com.example.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.bean.User;
import java.util.List;

public interface UserMapper extends BaseMapper {
    List findUser();
}

UserImpl.java

package com.example.impl;

import com.example.bean.User;

import java.util.List;

public interface UserImpl{
    List findUser();
}

UserService.java

package com.example.service;

import com.example.bean.User;
import com.example.impl.UserImpl;
import com.example.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;

@Service
public class UserService implements UserImpl {

    @Autowired
    private UserMapper userMapper;

    @Override
    public List findUser() {
        return userMapper.findUser();
    }
}

UserController.java

package com.example.controller;

import com.example.bean.User;
import com.example.service.UserService;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class UserController {
    private final UserService userService;

    public UserController(UserService userService) {
        this.userService = userService;
    }

    @RequestMapping(value = "/user",method = RequestMethod.POST)
    public List findUser(){
        return userService.findUser();
    }
}

Usermapper.xml

    
        select * from tb_user