环境

• IDEA2017
• MyBatis 2.0.0
• druid 阿里数据库连接池
• MySQL5.5

在MySQL建立test数据库，建立user表，字段为id(int), name(varchar(20))
先上目录结构

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1、 File -> new -> object -> Spring Initializer ->next

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等待片刻，IDEA初始化项目 是网速而定
2、配置文件

在application.propertier文件中

server.port=8080
spring.datasource.url=jdbc:mysql://localhost:3306/test?serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
mybatis.typeAliasesPackage=com.tqh.demo.model

在model下创建User.java
注意User为pojo，创建时，要和数据库表结构一致

package com.myblog.model;
import java.io.Serializable;
public class User implements Serializable {
    private int id;
    private String name;
    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                '}';
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

mapper/UserMapper.java

package com.myblog.mapper;
import com.myblog.model.User;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;

@Repository
public interface UserMapper {
    @Select("select * from user where id = #{id}")
    User selectUserById(int id);
}

service/UserService

package com.myblog.service;
import com.myblog.mapper.UserMapper;
import com.myblog.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserService {
    @Autowired
    UserMapper userMapper;
     public User selectUser(int id) {
        return userMapper.selectUserById(id);
    }
}

controller/UserController

package com.myblog.controller;

import com.myblog.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {
    @Autowired
    private UserService userService;

    @RequestMapping("show/{id}")
    public String test(@PathVariable int id){
        return userService.selectUser(id).toString();
    }
}

浏览器中输入localhost://8080/show/1 看到下图内容，显示数据库中内容

Springboot + MyBatis整合完毕