springboot和mybatis整合

项目结构

pom.xml

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.3.1</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.22</version>
</dependency>

User.java

package com.fengqing.aajspringbootmybatis.bean;

public class User {
    private Integer id;

    private String username;

    private String password;

    public Integer getId() {
        return id;
    }

    public void setId(Integer 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;
    }
}

UserMapper.java

package com.fengqing.aajspringbootmybatis.dao;

import com.fengqing.aajspringbootmybatis.bean.User;
import org.apache.ibatis.annotations.Param;

public interface UserMapper {
    public User get(@Param("id") Integer id);
}

UserService.java

package com.fengqing.aajspringbootmybatis.service;

import com.fengqing.aajspringbootmybatis.bean.User;

public interface UserService {
    public User getUser(Integer id);
}

UserServiceImpl.java

package com.fengqing.aajspringbootmybatis.service.impl;

import com.fengqing.aajspringbootmybatis.bean.User;
import com.fengqing.aajspringbootmybatis.dao.UserMapper;
import com.fengqing.aajspringbootmybatis.service.UserService;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

@Service("userService")
public class UserServiceImpl implements UserService {
    @Resource
    private UserMapper userMapper;

    @Override
    public User getUser(Integer id) {
        return this.userMapper.get(id);
    }
}

UserController.java

package com.fengqing.aajspringbootmybatis.controller;

import com.fengqing.aajspringbootmybatis.bean.User;
import com.fengqing.aajspringbootmybatis.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;

    @RequestMapping("/get")
    public String get(Integer id) {
        User user = this.userService.getUser(id);
        return user.getUsername() + "--" + user.getPassword();
    }
}

启动类AajspringbootMybatisApplication.java

package com.fengqing.aajspringbootmybatis;

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

@SpringBootApplication
@MapperScan("com.fengqing.aajspringbootmybatis.dao")
public class AajspringbootMybatisApplication {

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

UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.fengqing.aajspringbootmybatis.dao.UserMapper">
    <select id="get" resultType="user" parameterType="int">
      select * from users where id = #{id}
    </select>
</mapper>

application.properties

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://192.168.126.133:3306/mydb
spring.datasource.username=root
spring.datasource.password=123456

##指定mpper文件的位置
mybatis.mapper-locations=classpath:mapper/UserMapper.xml
##为实体类起别名
mybatis.type-aliases-package=com.fengqing.aajspringbootmybatis.bean

数据库mydb有个users表

启动springboot，打开浏览器访问 http://localhost:8080/user/get?id=1