如何在Spring初始化Bean或销毁Bean前执行某些操作

阅读文本大概需要3分钟。

0x01：通过在Bean中定义init-method 和 destory-method方法

1. public class Car {
2. 
3. 
4.  public Car() {
5.  System.out.println("Car's Constructor..");
6.  }
7. 
8. 
9.  public void init(){
10.  System.out.println("Car's Init...");
11.  }
12. 
13. 
14.  public void destory(){
15.  System.out.println("Car's Destroy...");
16.  }
17. 
18. 
19. }
20.  @Bean(initMethod = "init",destroyMethod = "destory")
21.  public Car car(){
22.  return new Car();
23.  }

0x02: 通过@PostConstruct和@PreDestroy方法实现初始化和销毁bean之前进行的操作

1. import javax.annotation.PostConstruct;
2. import javax.annotation.PreDestroy;
3. 
4. @Service
5. public class CustomerService
6. {
7.  String message;
8. 
9. 
10.  public String getMessage() {
11.  return message;
12.  }
13. 
14. 
15.  public void setMessage(String message) {
16.  this.message = message;
17.  }
18. 
19. 
20.  @PostConstruct
21.  public void initIt() throws Exception {
22.  System.out.println("Init method after properties are set : " + message);
23.  }
24. 
25. 
26.  @PreDestroy
27.  public void cleanUp() throws Exception {
28.  System.out.println("Spring Container is destroy! Customer clean up");
29.  }
30. 
31. }

这两个注解是JDK自带的，因此与Spring的耦合性较低（必须要Spring扫描到这个java类才能执行使用该注解的方法）

0x03: 通过bean实现InitializingBean和DisposableBean接口

1. @Service
2. public class CustomeService implements InitializingBean, DisposableBean
3. {
4.  String message;
5. 
6. 
7.  public String getMessage() {
8.  return message;
9.  }
10. 
11. 
12.  public void setMessage(String message) {
13.  this.message = message;
14.  }
15. 
16. 
17.  public void afterPropertiesSet() throws Exception {
18.  System.out.println("Init method after properties are set : " + message);
19.  }
20. 
21. 
22.  public void destroy() throws Exception {
23.  System.out.println("Spring Container is destroy! Customer clean up");
24.  }
25. 
26. }

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