SpringBoot container startup execution method and container shutdown execution method

Start the execution method:

Implement the run method in the ApplicationRunner interface .

If there are multiple implementation classes and you need them to be executed in a certain order, you can add the @Order annotation to the implementation class. @Order(value=integer value). SpringBoot will execute in order from small to large according to the value in @Order.

close execution method

One is to implement the DisposableBean interface, and the other is to use the @PreDestroy annotation.

1. @Component  
2. publicclass TestImplDisposableBean implements DisposableBean, ExitCodeGenerator {   
3.   
4.     @Override  
5.     publicvoid destroy() throws Exception {   
6.   
7.         System.out.println("<<<<<<<<<<<我被销毁了......................>>>>>>>>>>>>>>>");  
8.         System.out.println("<<<<<<<<<<<我被销毁了......................>>>>>>>>>>>>>>>");  
9.     }  
10.   
11.     @Override  
12.     public int  getExitCode() {   
13.   
14.         return5;   
15.     }  
16. }  

1. @Component  
2. public class  TestAnnotationPreDestroy {   
3.   
4.     @PreDestroy  
5.     publicvoid destory() {   
6.   
7.         System.out.println( "I was destroyed,,,,,I used @PreDestory method,,,,,,," );  
8.         System.out.println( "I was destroyed,,,,,I used @PreDestory method,,,,,,," );  
9.     }  
10. }