创建数据库及数据表：
CREATE DATABASE /*!32312 IF NOT EXISTS*/`springbootdb` /*!40100 DEFAULT CHARACTER SET utf8 */;

USE `springbootdb`;

/*Table structure for table `user` */

DROP TABLE IF EXISTS `user`;

CREATE TABLE `user` (
  `id` int(11) NOT NULL,
  `username` varchar(16) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
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2，创建User.java

package com.spb.SpringBootDemo.vo;

public class User {

    private String id;
    private String username;
    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;
    }

}
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3, 在pom.xml中加入：

<properties>
    <mybatis-spring-boot>1.2.0</mybatis-spring-boot>
     <mysql-connector>5.1.39</mysql-connector>
</properties>

 <!-- Spring Boot Mybatis 依赖 -->
  <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>${mybatis-spring-boot}</version>
   </dependency>

   <!-- MySQL 连接驱动依赖 -->
   <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <version>${mysql-connector}</version>
   </dependency>
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4, 在resource下加入application.properties文件，mysql和mybatis可以根据自己的地址配置。

spring.datasource.url=jdbc:mysql://localhost:3306/springbootdb?useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

mybatis.typeAliasesPackage=org.spring.springboot.domain
mybatis.mapperLocations=classpath:mapper/*.xml

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5，新增UserDao，并在resources下面创建mapper目录，在下面创建UserMapper.xml

package com.spb.SpringBootDemo.dao;

import java.util.List;

import com.spb.SpringBootDemo.vo.User;

/**
 *  
 * @author Administrator
 *
 */
public interface UserDao {

    /**
     * 新增用户
     * @param user
     */
    void createUser(User user);
    /**
     * 查询用户列表
     * @return
     */
    List<User> findAllUser();
}
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<?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.spb.SpringBootDemo.dao.UserDao">
    <resultMap id="BaseResultMap" type="com.spb.SpringBootDemo.vo.User">
        <result column="id" property="id" />
        <result column="username" property="username" />
    </resultMap>

    <parameterMap id="User" type="com.spb.SpringBootDemo.vo.User"/>

    <sql id="Base_Column_List">
        id, username
    </sql>
    <select id="findAllUser" resultMap="BaseResultMap" >
        select
        <include refid="Base_Column_List" />
        from user
    </select>

    <insert id="createUser" parameterMap="User" useGeneratedKeys="true" keyProperty="id">
        insert into
            user(id,username)
        values
            (#{id},#{username})
    </insert>

</mapper>
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6，最后增加service和实现controller,这里service省略。

package com.spb.SpringBootDemo.rest;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.spb.SpringBootDemo.service.IUserService;
import com.spb.SpringBootDemo.vo.User;

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

    @Autowired
    private IUserService service;
    @RequestMapping("/userList")
    public List<User> getUserList(){

        return service.findAllUser();
    }
    @RequestMapping("/add")
    public String addUser(@RequestBody User user){
        if(user!=null){
            service.createUser(user);
            return "success";
        }else{
            return "error";
        }
    }

}

app.java中加入注解@MapperScan("com.spb.SpringBootDemo.dao")
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测试：

运行项目
用postman测试 

源码：http://download.csdn.net/download/u012343297/10163177