package com.how2java.w3cschool.beanlife;

public class HelloWorld {

    private String message;

    public void getMessage() {

        System.out.println("Your message:" + message);

    }

    public void setMessage(String message) {

        this.message = message;

    }

    public void init() {

        System.out.println("Bean is going through init");

    }

    public void destroy() {

        System.out.println("Bean will destory now");

    }

}

package com.how2java.w3cschool.beanlife;                                                                                                           

import org.springframework.context.support.AbstractApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;                                                                         

public class MainApp {                                                                                                                             

    public static void main(String[] args) {

        AbstractApplicationContext context = new ClassPathXmlApplicationContext("beanlife.xml");

        HelloWorld obj = (HelloWorld) context.getBean("helloWorld"); //getBean是用来获取applicationContext.xml文件里bean的,括号内写的是对应的bean的id

        obj.getMessage();

        context.registerShutdownHook();  //需要注册一个在 AbstractApplicationContext 类中声明的关闭 hook 的 registerShutdownHook() 方法。它将确保正常关闭，并且调用相关的 destroy 方法。

    }

}
                                                                                                                                                   

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns:aop="http://www.springframework.org/schema/aop"

    xmlns:tx="http://www.springframework.org/schema/tx"

    xmlns:context="http://www.springframework.org/schema/context"

    xsi:schemaLocation="

   http://www.springframework.org/schema/beans

   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

   http://www.springframework.org/schema/aop

   http://www.springframework.org/schema/aop/spring-aop-3.0.xsd

   http://www.springframework.org/schema/tx

   http://www.springframework.org/schema/tx/spring-tx-3.0.xsd

   http://www.springframework.org/schema/context

   http://www.springframework.org/schema/context/spring-context-3.0.xsd">

   <bean id = "helloWorld"

       class = "com.how2java.w3cschool.beanlife.HelloWorld"

       init-method="init" destroy-method="destroy">

       <property name="message" value ="Hello World!"></property>

       </bean>

       <!-- init-method 属性指定一个方法，在实例化 bean 时，立即调用该方法,destroy-method 指定一个方法，只有从容器中移除 bean 之后，才能调用该方法。

       并且，上面指定bean对应的类为 HelloWorld，因此会到该bean(类)下去找对应的方法并调用-->

 </beans>