Spring之Bean的生命周期过程中调用的方法

1。这个部分除了6,9都在这了

1. package com.example.springbootdemo3.lifebeean;
3. import org.springframework.beans.BeansException;
4. import org.springframework.beans.factory.*;
5. import org.springframework.beans.factory.annotation.Value;
6. import org.springframework.context.ApplicationContext;
7. import org.springframework.context.ApplicationContextAware;
8. import org.springframework.stereotype.Component;
10. import javax.annotation.PostConstruct;
11. import javax.annotation.PreDestroy;
13. /**
14. * description
15. *
16. * @author PC 2025/02/27 20:26
17. */
18. @Component
19. public class MyBeanLife implements BeanNameAware, BeanFactoryAware, ApplicationContextAware, InitializingBean, DisposableBean {
22.     private String name;
24.     // 构造函数，当Bean被实例化时调用
25.     public MyBeanLife() {
26.         System.out.println("1.调用了Bean的构造函数");
27.     }
29.     @Value("name")
30.     public void setName(String name) {
31.         this.name = name;
32.         System.out.println("2.调用了Bean的set方法(属性的依赖注入)");
33.     }
35.     @Override
36.     public void setBeanName(String s) {
37.         System.out.println("3.调用了BeanNameAware的setBeanName方法,beanName:" + s);
38.     }
40.     @Override
41.     public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
42.         System.out.println("4.调用了BeanFactoryAware的setBeanFactory方法,beanFactory:" + beanFactory.toString());
43.     }
45.     @Override
46.     public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
47.         System.out.println("5.调用了ApplicationContextAware的setApplicationContext方法,applicationContext:" + applicationContext.toString());
48.     }
50.     @PostConstruct
51.     public void postConstruct() {
52.         System.out.println("7.调用了@PostConstruct注解的方法");
53.     }
55.     @Override
56.     public void afterPropertiesSet() throws Exception {
57.         System.out.println("8.调用了InitializingBean的afterPropertiesSet方法");
58.     }
60.     @PreDestroy
61.     public void preDestroy() {
62.         System.out.println("10.调用了@PreDestroy注解的方法");
63.     }
65.     @Override
66.     public void destroy() throws Exception {
67.         System.out.println("11.调用了DisposableBean的destroy方法");
68.     }
69. }

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2. 6和9部分

BeanPostProcessor的两个方法是所有Bean都会调用，除了实现这个接口的Bean，所以为了方便加了判定

1. package com.example.springbootdemo3.lifebeean;
3. import org.springframework.beans.BeansException;
4. import org.springframework.beans.factory.config.BeanPostProcessor;
5. import org.springframework.stereotype.Component;
7. /**
8. * description
9. *
10. * @author PC 2025/02/27 21:00
11. */
12. @Component
13. public class MyBeanLife2 implements BeanPostProcessor {
14.     @Override
15.     public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
16.         if (!beanName.equals("myBeanLife")) {
17.             return bean;
18.         }
19.         System.out.println("6.调用了BeanPostProcessor的postProcessBeforeInitialization方法,beanName:" + beanName);
20.         return bean;
21.     }
23.     @Override
24.     public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
25.         if (!beanName.equals("myBeanLife")) {
26.             return bean;
27.         }
28.         System.out.println("9.调用了BeanPostProcessor的postProcessAfterInitialization方法,beanName:" + beanName);
29.         return bean;
30.     }
31. }

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