Java Spring中Bean的作用域及生命周期

@Component
public class Users {

    @Bean
    public User user1(){
        User user = new User();
        user.setId(1);
        user.setName("Java");
        return user;
    }
}

@Component
public class Bean1 {

    @Autowired
    private User user;
    public User getUser(){
        System.out.println("Bean1对象未修改name之前 ： "+user);
        user.setName("c++");
        return user;
    }
}

@Component
public class Bean2 {
    @Autowired
    private User user;

    public User getUser(){
        return user;
    }
}

public class App {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-config.xml");

        Bean1 bean1 = context.getBean("bean1",Bean1.class);
        System.out.println(bean1.getUser());
        Bean2 bean2 = context.getBean("bean2",Bean2.class);
        System.out.println(bean2.getUser());
    }
}

public class BeanLifeComponent implements BeanNameAware {
    @PostConstruct
    public void PostConstruct(){
        System.out.println("执行@PostConstruct");
    }
    public void init(){
        System.out.println("执行bean-init-method");
    }
    public void use(){
        System.out.println("正在使用bean");
    }
    @PreDestroy
    public void PreDestroy(){
        System.out.println("执行@PreDestroy");
    }
    public void setBeanName(String s){
        System.out.println("执行了Aware通知");
    }
}

public class App2 {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring-config.xml");
        BeanLifeComponent beanLifeComponent = context.getBean(BeanLifeComponent.class);
        beanLifeComponent.use();
        context.destroy();
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:content="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    <content:component-scan base-package="com.beans"></content:component-scan>
    <bean id="1" class="com.beans.BeanLifeComponent" init-method="init"></bean>
</beans>

@Controller
public class TestUser {
    @Autowired
    private Test test;

    public TestUser(){
        test.sayHi();
        System.out.println("TestUser->调用构造方法");
    }
}