springboot框架搭建及接口快速开发

选择springboot版本和对应依赖https://start.spring.io/
下载demo文件，只保留src和pom.xml文件

配置数据库连接application.properties

spring.datasource.url=jdbc:mysql://localhost:3306/test?serverTimezone=GMT%2B8&characterEncoding=utf-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=123
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

entity:实体类，与数据库实体一一对应
User.java

package com.example.demo.entity;

import lombok.Data;



//使用Data注解简化生成getter和setter方法
@Data
public class User {
    private Integer id;
    private String name;
    private String address;
    private Integer age;
    private String sex;
    private String phone;
}

mapper：后台接口，数据库数据交互
UserMapper.java

package com.example.demo.mapper;

import com.example.demo.entity.User;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

public interface UserMapper {

    @Select("select * from user")
    List findAll();

    @Update("INSERT INTO `user` (`name`, `address`, `age`, `sex`, `phone`) VALUES (#{name}, #{address}, #{age}, " +
            "#{sex}, #{phone});")
    @Transactional
    void save(User user);

    @Update("update user set name=#{name}, address=#{address}, age=#{age},sex=#{sex}, phone=#{phone} where id=#{id}")
    @Transactional
    void updateById(User user);

    @Delete("delete from user where id = #{id}")
    void deleteById(Long id);
}

controller:对外（前端）提供接口，进行数据交互，例如get，post请求
UserController.java

package com.example.demo.controller;

import com.example.demo.entity.User;
import com.example.demo.mapper.UserMapper;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;



@RestController
@RequestMapping("/user")
public class UserController {

    //引入UserMapper接口
    @Resource
    UserMapper userMapper;

    @GetMapping
    public List getUser() {
        return userMapper.findAll();
    }

    @PostMapping
    public String addUser(@RequestBody User user){
        userMapper.save(user);
        return "success";
    }

    @PutMapping
    public String updateUser(@RequestBody User user) {
        userMapper.updateById(user);
        return "success";
    }

    @DeleteMapping("/{id}")
    public String deleteUser(@PathVariable("id") Long id) {
        userMapper.deleteById(id);
        return "success";
    }

}