Spring Bean InitializingBean和DisposableBean範例

1. 對於Bean實現 InitializingBean，它將執行 afterPropertiesSet()在所有的 bean 屬性被設定之後。
2. 對於 Bean 實現了DisposableBean，它將執行 destroy()在 Spring 容器釋放該 bean 之後。

範例

package com.yiibai.customer.services;

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

public class CustomerService implements InitializingBean, DisposableBean
{
	String message;
	
	public String getMessage() {
	  return message;
	}

	public void setMessage(String message) {
	  this.message = message;
	}
	
	public void afterPropertiesSet() throws Exception {
	  System.out.println("Init method after properties are set : " + message);
	}
	
	public void destroy() throws Exception {
	  System.out.println("Spring Container is destroy! Customer clean up");
	}
	
}

File : applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

       <bean id="customerService" class="com.yiibai.customer.services.CustomerService">
		<property name="message" value="I'm property message" />
       </bean>
		
</beans>

執行它

package com.tw511.common;

import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.yiibai.customer.services.CustomerService;

public class App 
{
    public static void main( String[] args )
    {
    	ConfigurableApplicationContext context = 
			new ClassPathXmlApplicationContext(new String[] {"applicationContext.xml"});
	
    	CustomerService cust = (CustomerService)context.getBean("customerService");
    	
    	System.out.println(cust);
    	
    	context.close();
    }
}

輸出結果

Init method after properties are set : I'm property message 
com.yiibai.customer.services.CustomerService@4090c06f 
Spring Container is destroy! Customer clean up