程序目录结构：

--Config

--Main

--user

    --UserDao

    --UserService

    --UserController

--item

    --ItemDao

    --ItemService

    --ItemController

1、组件类

package spring.example.anno.user;

import org.springframework.stereotype.Repository;

@Repository
public class UserDao {
}

package spring.example.anno.user;

import org.springframework.stereotype.Service;

@Service
public class UserService {
}

package spring.example.anno.user;

import org.springframework.stereotype.Controller;

@Controller
public class UserController {
}

package spring.example.anno.item;

import org.springframework.stereotype.Repository;

@Repository
public class ItemDao {
}

package spring.example.anno.item;

import org.springframework.stereotype.Service;

@Service
public class ItemService {
}

package spring.example.anno.item;

import org.springframework.stereotype.Controller;

@Controller
public class ItemController {
}

2、Config类

package spring.example.anno;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan(value = {"spring.example.anno.user", "spring.example.anno.item"})
public class Config {
}

3、Main类

package spring.example.anno;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Main {
    public static void main(String[] args) {
        ApplicationContext context=new AnnotationConfigApplicationContext(Config.class);
        String[] beanDefinitionNames = context.getBeanDefinitionNames();
        for(String name:beanDefinitionNames){
            System.out.println(name);
        }
    }
}

输出结果：

org.springframework.context.annotation.internalConfigurationAnnotationProcessor
org.springframework.context.annotation.internalAutowiredAnnotationProcessor
org.springframework.context.annotation.internalRequiredAnnotationProcessor
org.springframework.context.annotation.internalCommonAnnotationProcessor
org.springframework.context.event.internalEventListenerProcessor
org.springframework.context.event.internalEventListenerFactory
config
userController
userDao
userService
itemController
itemDao
itemService

一个创业中的苦逼程序员