学步园

通过注解配置Bean

TestObject.java

package com.spring.beans.annotation;
import org.springframework.stereotype.Component;;
 
@Component
public class TestObject {
 
}

UserController.java

package com.spring.beans.annotation.controller;
 
import org.springframework.stereotype.Controller;
 
@Controller
public class UserController {
 
    public void execute() {
        System.out.println("UserController execute...");
    }
}

UserRepository.java接口

package com.spring.beans.annotation.repository;
 
public interface UserRepository {
 
    void save();
}

UserRepositoryImpl.java

package com.spring.beans.annotation.repository;
 
import org.springframework.stereotype.Repository;
 
@Repository("userRepository")
public class UserRepositoryImpl implements UserRepository{
 
    @Override
    public void save() {
        // TODO Auto-generated method stub
        System.out.println("UserRepositoryImpl save...");
         
    }
 
}

UserService.java

package com.spring.beans.annotation.service;
 
import org.springframework.stereotype.Service;
 
@Service
public class UserService {
 
    public void add() {
        System.out.println("UserService add...");
    }
}

beans-annotation.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
 
    xsi:schemaLocation="

http://www.springframework.org/schema/context


http://www.springframework.org/schema/context/spring-context.xsd


http://www.springframework.org/schema/beans


http://www.springframework.org/schema/beans/spring-beans-4.0.xsd


http://www.springframework.org/schema/aop

    http://www.springframework.org/schema/aop/spring-aop-4.0.xsd">
 
    <!-- 指定spring IOC容器扫描的包 -->
    <!-- 通过resource-pattern指定扫描的资源 -->
    <!--  只扫描repository下的类
    <context:component-scan base-package="com.spring.beans.annotation" resource-pattern="repository/*.class"></context:component-scan>
    -->
    <!-- 不扫描repository注解的类 。可以配置多个。
    <context:component-scan base-package="com.spring.beans.annotation" >
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Repository"/>
    </context:component-scan>
    -->
    <!--  只扫描repository注解的类。可以配置多个。
    <context:component-scan base-package="com.spring.beans.annotation"  use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Repository"/>
    </context:component-scan>
    -->
    <!--  不扫描某个接口。可以配置多个。使用assignable类型
    <context:component-scan base-package="com.spring.beans.annotation"  use-default-filters="true">
        <context:exclude-filter type="assignable" expression="com.spring.beans.annotation.repository.UserRepository"/>
    </context:component-scan>
    -->
    <!--  只扫描某个接口。
    <context:component-scan base-package="com.spring.beans.annotation"  use-default-filters="false">
        <context:include-filter type="assignable" expression="com.spring.beans.annotation.repository.UserRepository"/>
    </context:component-scan>
    -->
     
    <context:component-scan base-package="com.spring.beans.annotation" ></context:component-scan>
     
</beans>

Main.java

package com.spring.beans.annotation;
 
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
import com.spring.beans.annotation.controller.UserController;
import com.spring.beans.annotation.repository.UserRepository;
import com.spring.beans.annotation.service.UserService;
 
public class Main {
 
    public static void main(String[] args) {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans-annotation.xml");
         
        TestObject testObject = (TestObject) applicationContext.getBean("testObject");
        System.out.println(testObject);
         
        UserController userController = (UserController) applicationContext.getBean("userController");
        System.out.println(userController);
         
        UserService userService = (UserService) applicationContext.getBean("userService");
        System.out.println(userService);
         
        UserRepository userRepository = (UserRepository) applicationContext.getBean("userRepository");
        System.out.println(userRepository);
    }
}