一：通過idea工具構建基礎框架

1. 打開idea，左上角File→New→Project，

2. 點擊Next

3. 點擊Next，配置如下圖，這裏我們選擇數據庫MySQL和持久層框架MyBatis

4. 點擊Next，選擇工作目錄，點擊Finish，開始構建

5. 創建完成後，項目目錄結構如下

二：配置數據庫信息

在application.properties文件中添加如下數據庫配置

spring.datasource.url=jdbc:mysql://localhost:3306/demo？useSSL=false&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&transformedBitIsBoolean=true&autoReconnect=true&failOverReadOnly=false
spring.datasource.username=數據庫用戶名
spring.datasource.password=數據庫密碼
spring.datasource.driverClassName=com.mysql.jdbc.Driver

三：創建數據庫UserInfo表

CREATE TABLE `user_info` (
  `id` int(32) NOT NULL AUTO_INCREMENT,
  `user_name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8; 

四：創建項目基本目錄結構

Model 存放實體類

package com.example.demo.model;

import javax.persistence.Column;
import javax.persistence.Id;

/**
 * @author 
 * @Description:
 * @time 2018/4/18 11:55
 */
public class UserInfo {

    /**
     * 主鍵
     */
    @Id
    private String id;

    /**
     * 用戶名
     */
    @Column(name = "user_name")
    private String userName;

    private String password;

    public String getId() {
        return id;
    }

    public void setId(String 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;
    }

}

　　Mapper

<?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.example.demo.dao.UserInfoMapper">
    <resultMap id="BaseResultMap" type="com.example.demo.model.UserInfo">
        <id column="id" jdbcType="INTEGER" property="id"/>
        <result column="user_name" jdbcType="VARCHAR" property="userName"/>
    </resultMap>

    <sql id="Base_Column_List">
      id,user_name
    </sql>

    <select id="selectById" parameterType="java.lang.Integer" resultMap="BaseResultMap">
        select
        <include refid="Base_Column_List"/>
        from user_info
        where id = #{id,jdbcType=VARCHAR}
    </select>

</mapper>

　　DAO層

package com.example.demo.dao;

import com.example.demo.model.UserInfo;
import org.apache.ibatis.annotations.Param;

/**
 * @author 
 * @Description:
 * @time 2018/4/18 11:54
 */
public interface UserInfoMapper {

    UserInfo selectById(@Param("id") Integer id);
}

　　Service

package com.example.demo.service;

import com.example.demo.model.UserInfo;

/**
 * @author 
 * @Description:
 * @time 2018/4/18 11:56
 */
public interface UserInfoService {

    UserInfo selectById(Integer id);

}

　　ServiceImpl

package com.example.demo.service.impl;

import com.example.demo.dao.UserInfoMapper;
import com.example.demo.model.UserInfo;
import com.example.demo.service.UserInfoService;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

/**
 * @author 
 * @Description:
 * @time 2018/4/18 11:56
 */
@Service
public class UserInfoServiceImpl implements UserInfoService{

    @Resource
    private UserInfoMapper userInfoMapper;

    public UserInfo selectById(Integer id){
        return userInfoMapper.selectById(id);
    }
}

　　Controller

package com.example.demo.controller;

import com.example.demo.model.UserInfo;
import com.example.demo.service.UserInfoService;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

/**
 * @author 
 * @Description:
 * @time 2018/4/18 11:39
 */
@RestController
@RequestMapping("userInfo")
public class UserInfoController {

    @Resource
    private UserInfoService userInfoService;

    @PostMapping("/hello")
    public String hello(){
        return "hello SpringBoot";
    }

    @PostMapping("/selectById")
    public UserInfo selectById(Integer id){
        return userInfoService.selectById(id);
    }
}

　　MyBatis 的配置Java類

package com.example.demo.core.configurer;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

import javax.sql.DataSource;

/**
 * @ClassName: MybatisConfigurer
 * @Description: Mybatis配置
 * @author 
 * @date 2018年1月20日 下午4:03:46
 *
 */
@Configuration
public class MybatisConfigurer {

   @Bean
   public SqlSessionFactory sqlSessionFactoryBean(DataSource dataSource) throws Exception {
      SqlSessionFactoryBean factory = new SqlSessionFactoryBean();
      factory.setDataSource(dataSource);
      factory.setTypeAliasesPackage("com.example.demo.model");
      // 添加XML目錄
      ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
      factory.setMapperLocations(resolver.getResources("classpath:mapper/*.xml"));
      return factory.getObject();
   }

   @Bean
   public MapperScannerConfigurer mapperScannerConfigurer() {
      MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
      mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactoryBean");
      mapperScannerConfigurer.setBasePackage("com.example.demo.dao");
      return mapperScannerConfigurer;
   }
}

@Configuration表示該文件是一個配置文件

@Bean表示該方法是一個傳統xml配置文件中的<Bean id=""></Bean>

其中factory.setTypeAliasesPackage("com.example.demo.model")表示項目中model的存儲路徑；

factory.setMapperLocations(resolver.getResources("classpath:mapper/*.xml"));表示mapper.xml存儲路徑；

mapperScannerConfigurer.setBasePackage("com.example.demo.dao");表示dao層的存儲路徑

五：運行項目

找到DemoApplication，右鍵，選擇run DemoApplication

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（一）搭建自己的SpringBoot後臺框架整合MyBatis