Spring课程 Spring入门篇 4-5 Spring bean装配之基于java的容器注解说明--@Bean

1　　　　解析

2　　　　代码演练

1　　　　解析

2　　　　代码演练

2.1　　@bean的应用不带name

实体类：

package com.imooc.beanannotation.javabased;

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

@Configuration
public class StoreConfig {
    
    @Bean
    public Store getStringStore(){
        return new StringStore();
    }

}

测试类：

package com.imooc.test.beanannotation;

import org.junit.Test;

import com.imooc.test.base.UnitTestBase;

public class TestJavaBased extends UnitTestBase{
    
    public TestJavaBased(){
        super("classpath*:spring-beanannotation.xml");
    }
    
    @Test
    public void testStoreConfig(){
        System.out.println(super.getbean("getStringStore").getClass().getName());
        
    }
    
    

}

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:context="http://www.springframework.org/schema/context" 
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">

<context:component-scan base-package="com.imooc.beanannotation"/>

</beans>

impl类：

package com.imooc.beanannotation.javabased;

public class StringStore implements Store {

}

dao类：

package com.imooc.beanannotation.javabased;

public interface Store {

}

打印结果：

三月 25, 2019 6:44:28 上午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@5a62a404: startup date [Mon Mar 25 06:44:28 CST 2019]; root of context hierarchy
三月 25, 2019 6:44:28 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from URL [file:/F:/xiangmu3/Xin/FuQiang/Spring/ddwei-dao/target/classes/spring-beanannotation.xml]
com.imooc.beanannotation.javabased.StringStore
三月 25, 2019 6:44:29 上午 org.springframework.context.support.ClassPathXmlApplicationContext doClose
信息: Closing org.springframework.context.support.ClassPathXmlApplicationContext@5a62a404: startup date [Mon Mar 25 06:44:28 CST 2019]; root of context hierarchy

2.2　　@bean的应用带name

实体类：

package com.imooc.beanannotation.javabased;

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

@Configuration
public class StoreConfig {
    
    @Bean(name="store")
    public Store getStringStore(){
        return new StringStore();
    }

}

测试类：

package com.imooc.test.beanannotation;

import org.junit.Test;

import com.imooc.test.base.UnitTestBase;

public class TestJavaBased extends UnitTestBase{
    
    public TestJavaBased(){
        super("classpath*:spring-beanannotation.xml");
    }
    
    @Test
    public void testStoreConfig(){
        System.out.println(super.getbean("store").getClass().getName());
        
    }
    
    

}

打印结果：

三月 25, 2019 6:57:00 上午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@2121052: startup date [Mon Mar 25 06:57:00 CST 2019]; root of context hierarchy
三月 25, 2019 6:57:00 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from URL [file:/F:/xiangmu3/Xin/FuQiang/Spring/ddwei-dao/target/classes/spring-beanannotation.xml]
com.imooc.beanannotation.javabased.StringStore
三月 25, 2019 6:57:01 上午 org.springframework.context.support.ClassPathXmlApplicationContext doClose
信息: Closing org.springframework.context.support.ClassPathXmlApplicationContext@2121052: startup date [Mon Mar 25 06:57:00 CST 2019]; root of context hierarchy

Spring课程 Spring入门篇 4-5 Spring bean装配之基于java的容器注解说明--@Bean

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