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
package com.wisely.heighlight_spring4.ch2.scope; import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Service; @Service
@Scope("singleton") //配置作用域单列(默认就是单列)
public class DemoSingletonService { }
package com.wisely.heighlight_spring4.ch2.scope; import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Service; @Service
@Scope("prototype") //配置作用域是多列
public class DemoPrototypeService { }
package com.wisely.heighlight_spring4.ch2.scope; import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration; @Configuration
@ComponentScan("com.wisely.heighlight_spring4.ch2.scope")
public class ScopeConfig { }
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)));
}
}