Spring注解驱动 @Scope设置组件作用域

1. @Scope使用流程

@Configuration
public class BeanConfig {
    @Scope("prototype") // 多实例
    @Bean
    public Person person() {
        // 多实例，容器每获取一次Person，就会调用该方法
        System.out.println("给容器添加Person");
        return new Person("jack", 10);
    }
    @Scope("singleton") // 单实例
    @Bean
    public Car car() {
        // 单实例，容器创建时，就会调用该方法
        System.out.println("给容器添加Car");
        return new Car();
    }
}

测试方法

@Test
public void test() {
    ApplicationContext ioc = new AnnotationConfigApplicationContext(BeanConfig.class);
    // 每获取一次Person
    Person person1 = (Person) ioc.getBean("person");
    Person person2 = (Person) ioc.getBean("person");
    Car car1 = (Car) ioc.getBean("car");
    Car car2 = (Car) ioc.getBean("car");
    System.out.println(person1 == person2);
    System.out.println(car1 == car2);
}