Spring容器初始化Bean、销毁Bean前所做操作的定义方式汇总

1、通过@javax.annotation.PostConstruct和@javax.annotation.PreDestroy定义

package com.xiaochuange.platform.spring4;import org.springframework.stereotype.Component; import javax.annotation.PostConstruct; import javax.annotation.PreDestroy;/*** @Desc:* @Auther: spring* @Date: 2018-9-12 14:56*/ @Component("initAndDestoryService") public class InitAndDestoryService {// 销毁之前执行@PreDestroypublic void methodPreDestroy() {System.out.println("InitAndDestoryService @PreDestroy invoke...");}// 初始化之前执行@PostConstructpublic void methodPostConstruct() {System.out.println("InitAndDestoryService @PostConstruct invoke...");}}

2、通过xml配置文件指定init-method和destroy-method

package com.xiaochuange.platform.spring4;/*** @Desc:* @Auther: spring* @Date: 2018-9-12 15:03*/ public class XmlInitAndDestoryService {private String message;public String getMessage() {return message;}public void setMessage(String message) {this.message = message;}public void methodInit(){System.out.println("XmlInitAndDestoryService methodInit invoke..." + message);}public void methodDestory(){System.out.println("XmlInitAndDestoryService methodDestory invoke..." + message);}}

applicationContext.xml

<bean id="xmlInitAndDestoryService"class="com.xiaochuange.platform.spring4.XmlInitAndDestoryService"init-method="methodInit" destroy-method="methodDestory"><property name="message" value="234"></property> </bean>

3、通过bean实现InitializingBean和DisposableBean接口

package com.xiaochuange.platform.spring4;import org.springframework.beans.factory.DisposableBean; import org.springframework.beans.factory.InitializingBean;/*** @Desc:* @Auther: spring* @Date: 2018-9-12 14:27*/ public class InitializingBeanAndDisposableBeanService implements InitializingBean, DisposableBean {private String message;public String getMessage() {return message;}public void setMessage(String message) {this.message = message;}@Overridepublic void destroy() throws Exception {// 销毁时的操作System.out.println("InitializingBeanAndDisposableBeanService destroy() invoke..." + message);}@Overridepublic void afterPropertiesSet() throws Exception {// 初始化时的操作System.out.println("InitializingBeanAndDisposableBeanService afterPropertiesSet() invoke..." + message);}}

applicationContext.xml

<bean id="personService" class="com.xiaochuange.platform.spring4.InitializingBeanAndDisposableBeanService"><property name="message" value="123"></property> </bean>

4、测试

package com.xiaochuange.platform.spring4;import org.springframework.context.support.AbstractApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext;/*** @Desc:* @Auther: spring* @Date: 2018-9-12 14:45*/ public class MainTest {public static void main(String[] args) {AbstractApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");InitializingBeanAndDisposableBeanService personService = (InitializingBeanAndDisposableBeanService) context.getBean("personService");InitAndDestoryService initAndDestoryService = (InitAndDestoryService) context.getBean("initAndDestoryService");XmlInitAndDestoryService xmlInitAndDestoryService = (XmlInitAndDestoryService) context.getBean("xmlInitAndDestoryService");context.registerShutdownHook();// 输出如下： // InitAndDestoryService @PostConstruct invoke... // InitializingBeanAndDisposableBeanService afterPropertiesSet() invoke...123 // XmlInitAndDestoryService methodInit invoke...234 // XmlInitAndDestoryService methodDestory invoke...234 // InitializingBeanAndDisposableBeanService destroy() invoke...123 // InitAndDestoryService @PreDestroy invoke...} }

转载于:https://blog.51cto.com/springsupervip/2174254

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