如何创建SpringBoot项目并整合Mybaits(奶奶看了都会)

1.打开idea,并新建

 2.项目类型选择Spring Initializr 

3.选择依赖

 4.等待依赖下载完成

 加载完成后项目就创建完成了

测试

接下来我们写一个方法测试一下

运行

可能遇到的问题:(没自动导入的话把鼠标移到@Test处，手动导入)

运行成功

接口测试

1.添加maven依赖（在pom.xml文件中）不要忘记刷新maven!!!

 	
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            2.1.1
      
        
            mysql
            mysql-connector-java
            runtime
      

2.修改配置文件

3.修改启动类

 配置完成

测试

xml

    
        select * from user
    

 实体类

package test.demo.entity;

public class User {
    private Long id;
    public String username;
    public String password;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + ''' +
                ", password='" + password + ''' +
                '}';
    }
}

mapper层

package test.demo.mapper;

import test.demo.entity.User;

import java.util.List;

public interface UserMapper {

    List listAll();
}

service层

package test.demo.service;

import test.demo.entity.User;

import java.util.List;

public interface UserService {
    List listAll();
}

impl层

package test.demo.service.impl;

import test.demo.mapper.UserMapper;
import test.demo.service.UserService;
import org.springframework.stereotype.Service;
import test.demo.entity.User;

import javax.annotation.Resource;
import java.util.List;
@Service
public class UserServiceImpl implements UserService {

    @Resource
    private UserMapper userMapper;

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

controller

package test.demo.controller;

import org.springframework.web.bind.annotation.ResponseBody;
import test.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import test.demo.entity.User;

import java.util.List;

@Controller
@RequestMapping("user")
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("listAll")
    @ResponseBody
    public List listAll(){
        return userService.listAll();
    }
}

数据库

 测试