@Autowired按类型自动装配的，但在我写的代码中并没有表现出来，请老师帮我看看，是什么情况

dao层代码如下：

package com.imooc.ioc.dao;
public interface IUserDao {
   void insert();
}

package com.imooc.ioc.dao;
import org.springframework.stereotype.Repository;
@Repository
public class UserDao implements IUserDao {
   public UserDao() {
       System.out.println("执行UserDao构造方法" + this);
   }
   @Override
   public void insert() {
       System.out.println("插入一条用户数据" + this);
   }
}

package com.imooc.ioc.dao;
import org.springframework.stereotype.Repository;
@Repository
public class UserMySqlDao implements IUserDao {
   public UserMySqlDao() {
       System.out.println("执行UserMySqlDao构造方法" + this);
   }
   @Override
   public void insert() {
       System.out.println("向MySQL数据库插入一条数据" + this);
   }
}

package com.imooc.ioc.dao;
import org.springframework.stereotype.Repository;
@Repository
public class UserOracleDao implements IUserDao {
   public UserOracleDao() {
       System.out.println("执行UserOracleDao构造方法" + this);
   }
   @Override
   public void insert() {
       System.out.println("向Oracle数据库插入一条数据" + this);
   }
}

service层代码如下：

package com.imooc.ioc.service;
import com.imooc.ioc.dao.IUserDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class UserService {
   @Autowired
   private IUserDao userDao;
   @Autowired
   private IUserDao userMySqlDao;
   @Autowired
   private IUserDao userOracleDao;
//    @Autowired
   private IUserDao iUserDao;
   public void insert(){
       System.out.println("-------------------");
       userDao.insert();
       userMySqlDao.insert();
       userOracleDao.insert();
       iUserDao.insert();
   }
   public IUserDao getUserDao() {
       return userDao;
   }
   public void setUserDao(IUserDao userDao) {
       this.userDao = userDao;
   }
   public IUserDao getUserMySqlDao() {
       return userMySqlDao;
   }
   public void setUserMySqlDao(IUserDao userMySqlDao) {
       this.userMySqlDao = userMySqlDao;
   }
   public IUserDao getUserOracleDao() {
       return userOracleDao;
   }
   public void setUserOracleDao(IUserDao userOracleDao) {
       this.userOracleDao = userOracleDao;
   }
}

程序入口代码如下：

package com.imooc.ioc;
import com.imooc.ioc.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class SpringApplication {
   public static void main(String[] args) {
       ApplicationContext context = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
       UserService userService = context.getBean("userService", UserService.class);
       userService.insert();
   }
}

applicationContext.xml配置信息如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans"
      xmlns:context="http://www.springframework.org/schema/context"
      xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
   <context:component-scan base-package="com.imooc"/>
</beans>

pom.xml配置信息如下：

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.imooc</groupId>
   <artifactId>TestAutowired</artifactId>
   <version>1.0-SNAPSHOT</version>
   <dependencies>
       <dependency>
           <groupId>org.springframework</groupId>
           <artifactId>spring-context</artifactId>
           <version>5.2.6.RELEASE</version>
       </dependency>
   </dependencies>
</project>

以上就是我写的全部代码，执行的结果依然是没有报老师演示的错误