JavaSpring-Bean的初始化和销毁思维导图

使用@Bean的initMethod和destroyMethod

利用JSR-250的@PostConstruct和@PreDestroy

<dependency> <groupId>javax.annotation</groupId> <artifactId>jsr250-api</artifactId> <version>1.0</version> </dependency>

package com.wisely.highlight_spring4.ch2.prepost; public class BeanWayService { public void init(){ System.out.println("@Bean-init-method"); } public BeanWayService() { super(); System.out.println("初始化构造函数-BeanWayService"); } public void destroy(){ System.out.println("@Bean-destory-method"); } }

package com.wisely.highlight_spring4.ch2.prepost; public class JSR250WayService { @PostConstruct //1 在构造函数执行完之后执行 public void init(){ System.out.println("jsr250-init-method"); } public JSR250WayService() { super(); System.out.println("初始化构造函数-JSR250WayService"); } @PreDestroy //2 在Bean销毁之前执行 public void destroy(){ System.out.println("jsr250-destory-method"); } }

package com.wisely.highlight_spring4.ch2.prepost; @Configuration @ComponentScan("com.wisely.highlight_spring4.ch2.prepost") public class PrePostConfig { @Bean(initMethod="init",destroyMethod="destroy") //1 指定BeanWayService类的init和destroy方法在构造之后、Bean销毁之前执行 BeanWayService beanWayService(){ return new BeanWayService(); } @Bean JSR250WayService jsr250WayService(){ return new JSR250WayService(); } }

public class Main { public static void main(String[] args) { AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(PrePostConfig.class); BeanWayService beanWayService = context.getBean(BeanWayService.class); JSR250WayService jsr250WayService = context.getBean(JSR250WayService.class); context.close(); } }

初始化构造函数-BeanWayService @Bean-init-method 初始化构造函数-JSR250WayService jsr250-init-method jsr250-destory-method @Bean-destory-method