Spring Bean Lifecycle Control

本文目的是通过示例告诉大家sprng bean生命周期的控制。

主要通过两个接口InitializingBean、DisposableBea，验证bean在容器中初始化以及销毁时候的触发事件。

当然也可以通过配置xml的文件，init-method、destroy-method等同于上述两个接口

1.InitializingBean and DisposableBean interfaces

 

package com.javacodegeeks.snippets.enterprise.services;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;

public class Employee implements InitializingBean, DisposableBean {

	private Long id;

	private String position;

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getPosition() {
		return position;
	}

	public void setPosition(String position) {
		this.position = position;
	}

	@Override
	public String toString() {
		return "id " + id + " and position " + position;
	}

	@PostConstruct
	public void initIt() throws Exception {
		System.out.println("Init method after properties are set : " + id + " "
				+ position);
	}

	@PreDestroy
	public void cleanUp() throws Exception {
		System.out.println("Spring Clean Up! Employee is cleaned up now.");
	}

	@Override
	public void destroy() throws Exception {
		System.out.println("I am in destroy... ");

	}

	@Override
	public void afterPropertiesSet() throws Exception {
		System.out.println("I am in afterPropertiesSet... ");

	}
}

 2.Use of init-method and destroy-method attributes in bean definition

 

 

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:task="http://www.springframework.org/schema/task"
	xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd">
	
		<bean id="employeeBean" class="com.javacodegeeks.snippets.enterprise.services.Employee" init-method="initIt" destroy-method="cleanUp">
		<property name="id" value="123"/>
		<property name="position" value="marketing"/>
	</bean>

</beans>

 3.@PostConstruct and @PreDestroy annotations

 

 

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:task="http://www.springframework.org/schema/task"
	xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd">
	
	<context:annotation-config />
		<bean id="employeeBean" class="com.javacodegeeks.snippets.enterprise.services.Employee">
		<property name="id" value="123"/>
		<property name="position" value="marketing"/>
	</bean>

</beans>

 4.OutPut