spring boot集成mybatis（xml配置模式）

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.0</version>
        <relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <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>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.1</version>
        </dependency>
    </dependencies>

import java.io.Serializable;

public class UserEntity implements Serializable {

    private Long id;

    private String user_name;

    private String passWord;

    private String realName;


    public Long getId() {
        return id;
    }

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

    public String getUser_name() {
        return user_name;
    }

    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }

    public String getPassWord() {
        return passWord;
    }

    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }

    public String getRealName() {
        return realName;
    }

    public void setRealName(String realName) {
        this.realName = realName;
    }
}

@Repository
public interface UserMapper {
    UserEntity queryUser(int id);
}

@Service
public class UserService {

    @Autowired
    UserMapper userMapper;

    public UserEntity Sel(int id) {
        return userMapper.queryUser(id);
    }
}

<?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.mybatis14.mapper.UserMapper">

       <!-- <resultMap id="BaseResultMap" type="***.com.mybatis14.entity.UserEntity">
            <result column="id" jdbcType="INTEGER" property="id" />
            <result column="user_name" jdbcType="VARCHAR" property="user_name" />
            <result column="passWord" jdbcType="VARCHAR" property="passWord" />
            <result column="realName" jdbcType="VARCHAR" property="realName" />
        </resultMap>-->

    <select id="queryUser" resultType="***.com.mybatis14.entity.UserEntity">
        select * from user where id = #{id}
    </select>

</mapper>

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

    @Autowired
    private UserService userService;

    @RequestMapping("/get")
    public UserEntity getUserByName(int id) {
        return userService.Sel(id);
    }
}

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

mybatis.mapper-locations=classpath:mapping/*Mapper.xml
#mybatis.type-aliases-package=***.com.mybatis14.entity

@MapperScan("***.com.mybatis14.mapper")
@SpringBootApplication
public class Mybatis14Application {
    public static void main(String[] args) {
        SpringApplication.run(Mybatis14Application.class, args);
    }
}