Bean的scope:

1、Singleton(单例)： 一个Spring容器只有以这个Bean实例。

2、prototype(多例)： 每次调用新建一个Bean的实例。

3、request：一个http request请求一个Bean实例。

4、Session：一个http session请求一个Bean实例。

5、GlobalSession：portal应用中有用

1 package com.wisely.heighlight_spring4.ch2.scope; 2  3 import org.springframework.context.annotation.Scope; 4 import org.springframework.stereotype.Service; 5  6 @Service 7 @Scope("singleton")        //配置作用域单列(默认就是单列) 8 public class DemoSingletonService { 9 10 }

1 package com.wisely.heighlight_spring4.ch2.scope; 2  3 import org.springframework.context.annotation.Scope; 4 import org.springframework.stereotype.Service; 5  6 @Service 7 @Scope("prototype")            //配置作用域是多列 8 public class DemoPrototypeService { 9 10 }

1 package com.wisely.heighlight_spring4.ch2.scope; 2  3 import org.springframework.context.annotation.ComponentScan; 4 import org.springframework.context.annotation.Configuration; 5  6 @Configuration 7 @ComponentScan("com.wisely.heighlight_spring4.ch2.scope") 8 public class ScopeConfig { 9 10 }

package com.wisely.heighlight_spring4.ch2.scope;import org.springframework.context.annotation.AnnotationConfigApplicationContext;public class Main {    public static void main(String[] args) {        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ScopeConfig.class);        DemoSingletonService demoSingletonService1 = context.getBean(DemoSingletonService.class);        DemoSingletonService demoSingletonService2 = context.getBean(DemoSingletonService.class);        System.out.println("Singleton++++"+(demoSingletonService1.equals(demoSingletonService2)));                DemoPrototypeService demoPrototypeService1 = context.getBean(DemoPrototypeService.class);        DemoPrototypeService demoPrototypeService2 = context.getBean(DemoPrototypeService.class);        System.out.println("prototype++++"+(demoPrototypeService1.equals(demoPrototypeService2)));    }}