@Scope注解的范围

1. Singleton：一个Spring容器只有一个Bean实例，也是默认配置
2. Prototype：每次调用新建一个Bean实例
3. Request：web项目中，每一个http request新建一个Bean实例
4. Session：web项目中，每一个http session新建一个Bean实例
5. GlobalSession：portal应用中使用

单例service类

import org.springframework.stereotype.Service;/** * @author Kevin * @description * @date 2016/6/30 */@Service// 默认为singleto 相当于@Scope("singleton")public class DemoSingletonService {}

Prototype service类

import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Service;/** * @author Kevin * @description * @date 2016/6/30 */@Service@Scope("prototype")public class DemoPrototypeService {}

配置类

import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;/** * @author Kevin * @description * @date 2016/6/30 */@Configuration// 扫描所在包@ComponentScan("ch02.scope")public class Config {}

运行

import org.springframework.context.annotation.AnnotationConfigApplicationContext;/** * @author Kevin * @description * @date 2016/6/30 */public class Main {    public static void main(String[] args) {        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(Config.class);        DemoSingletonService s1 = context.getBean(DemoSingletonService.class);        DemoSingletonService s2 = context.getBean(DemoSingletonService.class);        DemoPrototypeService p1 = context.getBean(DemoPrototypeService.class);        DemoPrototypeService p2 = context.getBean(DemoPrototypeService.class);        System.out.println("s1 == s2 : " + (s1 == s2));        System.out.println("p1 == p2 : " + (p1 == p2));    }}

结果