initialization and destroy methods in bean

最新推荐文章于 2022-05-17 14:28:41 发布

原创最新推荐文章于 2022-05-17 14:28:41 发布 · 604 阅读

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本文通过一个具体的示例展示了如何使用 Spring 框架管理 Java Bean 的生命周期，包括初始化和销毁的方法。通过 web.xml 配置文件定义了一个 Contact Bean，并在 Contact 类中实现了自定义的初始化和销毁逻辑。

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web.xml

 	<bean id="contactBean" class="com.vf.constructor.objectmatch.Contact" init-method="init" destroy-method="destroy">
 	<property name="name" value="charles fels"></property>
	</bean>

Contact.java

package com.vf.constructor.objectmatch;

import org.apache.log4j.Logger;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Contact {

	/**
	 * @param args
	 */
	private String name;
	private int age;
	private static Logger logger = Logger.getLogger(Contact.class.getPackage().getName());
	
	public void init() {
		if(name == null) {
			logger.debug("You are not authenticated.");
			throw new IllegalArgumentException ("Initialization failed.");
		}
		
	}
	
	public void destroy() {
		logger.debug("Destroying starting.");
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getName() {
		return name;
	}
	
	public void setAge(int age) {
		this.age = age;
	}
	public int getAge() {
		return age;
	}
	
	public String toString() {
		return "Name: " + name + " Age: " + age;
	}
	
	public static void main(String[] args) {
		ApplicationContext context = new ClassPathXmlApplicationContext("web.xml");
		Contact contact = context.getBean("contactBean", Contact.class);
		logger.debug(contact);
		((AbstractApplicationContext) context).close();
	}
	

}
DEBUG - Name: charles fels Age: 0
DEBUG - Destroying starting.