做网站排版网站的弹窗对话框怎么做

一、概述

        bean的生命周期的回调方法主要分两种，一种是初始化时进行调用，另外一种是销毁时进行调用。但是不管是初始化还是销毁，都对应着三种方式。

二、实现方式

2.1、注解方式

@PostConstruct + @PreDestroy

@Component
public class UserService {public UserService() {System.out.println("UserService的构造方法执行了...");}@PostConstructpublic void init() {System.out.println("UserService 初始化...");}@PreDestroypublic void destroy () {System.out.println("UserService 销毁...");}}

2.2、实现接口方式

@Component
public class UserService2 implements InitializingBean, DisposableBean {public UserService2() {System.out.println("UserService2的构造方法执行了...");}@Overridepublic void afterPropertiesSet() throws Exception {System.out.println("UserService2 初始化...");}@Overridepublic void destroy() throws Exception {System.out.println("UserService2 销毁...");}
}

2.3、通过指定initMethod和destoryMethod方式

public class UserService3 {public UserService3() {System.out.println("UserService3的构造方法执行了...");}public void init() {System.out.println("UserService3 初始化...");}public void destroy() {System.out.println("UserService3 销毁...");}}

@Configuration
@ComponentScan(basePackages = "org.star")
public class MySpringConfig {@Bean(initMethod = "init",destroyMethod = "destroy")public UserService3 userService3() {return new UserService3();}}