Spring实战——Bean销毁之前的行为

梦里梦外; 2021-07-24 19:49 351阅读 0赞

**一 配置**

<?xml version="1.0" encoding="GBK"?>
    <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://www.springframework.org/schema/beans"
         xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-4.0.xsd">
         <bean id="steelAxe"  class="org.crazyit.app.service.impl.SteelAxe"/>
         
         <bean id="chinese"  class="org.crazyit.app.service.impl.Chinese"
               destroy-method="close">
               <property name="axe" ref="steelAxe"/>
         </bean>
    </beans>

**二 接口**

1 Axe

package org.crazyit.app.service;
    
    public interface Axe
    {
         public String chop();
    }

2 Person

package org.crazyit.app.service;
    
    public interface Person
    {
         public void useAxe();
    }

**三 Bean**

1 Chinese

package org.crazyit.app.service.impl;
    
    
    import org.springframework.beans.factory.DisposableBean;
    
    
    import org.crazyit.app.service.*;
    
    public class Chinese implements Person,DisposableBean
    {
        private Axe axe;
        public Chinese()
        {
            System.out.println("Spring实例化主调bean：Chinese实例...");
        }
        public void setAxe(Axe axe)
        {
            System.out.println("Spring执行依赖关系注入...");
            this.axe = axe;
        }
        public void useAxe()
        {
            System.out.println(axe.chop());
        }
        public void close()
        {
            System.out.println("正在执行销毁之前的方法 close...");
        }
        public void destroy() throws Exception
        {
            System.out.println("正在执行销毁之前的方法 destroy...");
        }
    }

2 SteelAxe

package org.crazyit.app.service.impl;
    import org.crazyit.app.service.*;
    
    public class SteelAxe implements Axe
    {
         public SteelAxe()
         {
               System.out.println("Spring实例化依赖bean：SteelAxe实例...");
         }
         public String chop()
         {
               return "钢斧砍柴真快";
         }
    }

**四 测试类**

package lee;
    
    
    import org.springframework.context.*;
    import org.springframework.context.support.*;
    
    
    import org.crazyit.app.service.*;
    
    public class BeanTest
    {
        public static void main(String[] args)
        {
            // 以CLASSPATH路径下的配置文件创建ApplicationContext
            AbstractApplicationContext ctx = new
                ClassPathXmlApplicationContext("beans.xml");
            // 获取容器中的Bean实例
            Person p = ctx.getBean("chinese" , Person.class);
            p.useAxe();
            // 为Spring容器注册关闭钩子
            ctx.registerShutdownHook();
        }
    }

**五 测试结果**

Spring实例化依赖bean：SteelAxe实例...
    Spring实例化主调bean：Chinese实例...
    Spring执行依赖关系注入...
    钢斧砍柴真快
    九月 21, 2019 9:30:18 下午  org.springframework.context.support.ClassPathXmlApplicationContext doClose
    信息: Closing  org.springframework.context.support.ClassPathXmlApplicationContext@5a10411: startup date [Sat Sep 21 21:30:18 CST 2019]; root of  context hierarchy
    正在执行销毁之前的方法 destroy...
    正在执行销毁之前的方法 close...