1. 实现标识接口 InitializingBean，DisposableBean(不推荐使用,耦合性太高)
2. 设置bean属性 Init-method destroy-method
3. 使用注释配置后，调用@PostConstruct和@PreDestroy注解

• 对于init-method方法，它将运行 afterPropertiesSet()在所有的 bean 属性被设置之后。
• 对于destroy-method方法，它将运行 destroy()在 Spring 容器释放该 bean 之后。

package com.yiibai.customer.services;

public class CustomerService

{

    String message;

    public String getMessage() {

      return message;

    }

    public void setMessage(String message) {

      this.message = message;

    }

    public void initIt() throws Exception {

      System.out.println("Init method after properties are set : " + message);

    }

    public void cleanUp() throws Exception {

      System.out.println("Spring Container is destroy! Customer clean up");

    }

}

File : applicationContext.xml, 在bean中定义了init-method和destroy-method属性。

<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"

        init-method="initIt" destroy-method="cleanUp">

        <property name="message" value="i'm property message" />

    </bean>

</beans>

package com.yiibai.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();

    }

}