my batis-plus 설정 에서 Mapper 인터페이스 경 로 를 찾 을 수 없 는 구덩이 입 니 다.

@Test
public void findUser(){
	SystemUser systemUser= systemUserService.findUserByName("admin");
	System.out.println(systemUser.toString());
}

@EnableTransactionManagement
@Configuration
@MapperScan("com.husy.mapper")
public class MybatisConfig {

  /**
   * mybatis-plus     
   */
  @Bean
  public PaginationInterceptor paginationInterceptor() {
    return new PaginationInterceptor();
  }
}

@Service
public class SystemUserServiceImpl implements SystemUserService {
	@Autowired
	private SystemUserMapper userMapper;

	@Override
	public SystemUser findUserByName(String name) {
		return userMapper.findUserByName(name);
	}
}

@Component
public interface SystemUserMapper {
	SystemUser findUserByName(@Param("userAccount") String name);
}

<?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.husy.mapper.SystemUserMapper">
  <resultMap id="systemUserMap" type="com.husy.domain.SystemUser" >
    <id column="user_id" property="userId" />
    <result column="user_account" property="userAccount" />
    <result column="user_password" property="userPassword" />
    <result column="user_phone" property="userPhone" />
  </resultMap>
  <select id="findUserByName" resultMap="systemUserMap">
     SELECT
      user_id,
      user_account,
      user_password,
      user_phone
     FROM t_system_user
     where user_account = #{userAccount}
  </select>
</mapper>

<dependency>
  <groupId>com.baomidou</groupId>
   <artifactId>mybatis-plus-boot-starter</artifactId>
   <version>3.1.0</version>
 </dependency>

mybatis.mapper-locations=classpath:mapper/*.xml

<dependency>
  <groupId>com.baomidou</groupId>
  <artifactId>mybatis-plus</artifactId>
  <version>3.1.0</version>
</dependency>

mybatis.mapper-locations=classpath:mapper/*.xml

<dependency>
   <groupId>com.baomidou</groupId>
   <artifactId>mybatis-plus-boot-starter</artifactId>
   <version>3.1.0</version>
 </dependency>

mybatis-plus.mapper-locations=classpath:mapper/*.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.2.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>
  <groupId>com.example</groupId>
  <artifactId>demo</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>demo</name>
  <description>Demo project for Spring Boot</description>

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

  <dependencies>
    <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>2.1.1</version>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-boot-starter</artifactId>
      <version>3.3.0</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
      <exclusions>
        <exclusion>
          <groupId>org.junit.vintage</groupId>
          <artifactId>junit-vintage-engine</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>

</project>

# DataSource Config
spring.datasource.url=jdbc:mysql://localhost:3306/db_husy?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=GMT%2B8&zeroDateTimeBehavior=CONVERT_TO_NULL
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

mybatis-plus.mapper-locations=classpath:/mapper/*.xml

@EnableTransactionManagement
@Configuration
@MapperScan("com.example.demo.mapper")
public class MybatisConfig {
	/**mybatis-plus     */
	@Bean
	public PaginationInterceptor paginationInterceptor() {
		return new PaginationInterceptor();
	}
}

@SpringBootTest
class DemoApplicationTests {
	@Autowired
	SystemUserService systemUserService;
	@Test
	public void findUser(){
		SystemUser systemUser= systemUserService.findUserByName("admin");
		System.out.println(systemUser.toString());
	}

}