默認(rèn)@Bean是單例的，但可以使用@Scope注解來(lái)覆蓋此如下：

@Configuration

public class MyConfiguration {

@Bean

@Scope("prototype")

public MovieCatalog movieCatalog(){

//...

}

}

Bean的作用域包括singleton、prototype、request、session、global session

例子：

新建接口Store及實(shí)現(xiàn)類(lèi)StoreImpl

package com.scope;

public interface Store {

}

package com.scope;

public class StoreImpl implements Store {

}

java config 實(shí)現(xiàn)

package com.scope;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.context.annotation.Scope;

@Configuration

public class StoreConfig {

@Bean

@Scope("prototype")

public Store stringStore(){

return new StoreImpl();

}

}

XML配置：

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-4.1.xsd

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

http://www.springframework.org/schema/context/spring-context-4.1.xsd">

單元測(cè)試：

package com.scope;

import org.junit.Test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class UnitTest {

@Test

public void test(){

ApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring-beanannotation.xml");

Store store=(Store)context.getBean("stringStore");

System.out.println(store.hashCode());

Store store2=(Store)context.getBean("stringStore");

System.out.println(store2.hashCode());

}

}

結(jié)果：

2015-7-8 9:47:11 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@36b8bef7: startup date [Wed Jul 08 09:47:11 CST 2015]; root of context hierarchy

2015-7-8 9:47:11 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

信息: Loading XML bean definitions from class path resource [spring-beanannotation.xml]

1152423575

628012732

結(jié)果發(fā)現(xiàn)，兩個(gè)對(duì)象的hashcode不一樣，說(shuō)明每次取出的都是新的對(duì)象。

總結(jié)

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