06_init()和destroy()方法

【工程截图】

【HelloWorld.java】

package com.HigginCui;

public class HelloWorld {
    public HelloWorld(){
        System.out.println("Create Object...");
    }
    
    public void init(){
        System.out.println("init method...");
    }
    
    public void hello(){
        System.out.println("hello world...");
    }
    
    public void destroy(){
        System.out.println("destroy method...");
    }
}

【applicationContext.xml】

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:aop="http://www.springframework.org/schema/aop"
       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
           http://www.springframework.org/schema/aop 
           http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
    <!-- 
        init-method:初始化方法
        destroy-method:销毁方法
     -->    
     <bean id="helloWorld"
            class="com.HigginCui.HelloWorld"
            init-method="init"
            destroy-method="destroy">
    </bean>
</beans>

【testHelloWorld.java】

package com.HigginCui.test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.HigginCui.HelloWorld;

public class testHelloWorld {
    @Test
    public void test(){
        ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
        HelloWorld helloWorld=(HelloWorld) context.getBean("helloWorld");
        helloWorld.hello();
        
        //关闭Spring容器(为了执行destroy方法，一般spring不关闭)
        ClassPathXmlApplicationContext applicationContext=(ClassPathXmlApplicationContext) context;
        applicationContext.close();
    }
}

【运行结果】

2016-6-10 15:23:34 org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@26ee7a14: display name [org.springframework.context.support.ClassPathXmlApplicationContext@26ee7a14]; startup date [Fri Jun 10 15:23:34 CST 2016]; root of context hierarchy
2016-6-10 15:23:34 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [applicationContext.xml]
2016-6-10 15:23:34 org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory
信息: Bean factory for application context [org.springframework.context.support.ClassPathXmlApplicationContext@26ee7a14]: org.springframework.beans.factory.support.DefaultListableBeanFactory@2b5575e0
2016-6-10 15:23:34 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@2b5575e0: defining beans [helloWorld]; root of factory hierarchy
Create Object...
init method...
hello world...
2016-6-10 15:23:34 org.springframework.context.support.AbstractApplicationContext doClose
信息: Closing org.springframework.context.support.ClassPathXmlApplicationContext@26ee7a14: display name [org.springframework.context.support.ClassPathXmlApplicationContext@26ee7a14]; startup date [Fri Jun 10 15:23:34 CST 2016]; root of context hierarchy
2016-6-10 15:23:34 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry destroySingletons
信息: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@2b5575e0: defining beans [helloWorld]; root of factory hierarchy
destroy method...

【小结】

从运行结果可以看出，先运行HelloWorld()构造方法，然后运行init()初始化方法，然后再运行调用的hello()的方法，最后关闭spring容器时运行destroy()销毁方法。