Bean 的生命周期

生命周期：定义，初始化，使用，销毁

一.初始化

方法1

实现org.springframework.beans.foctory.InitializingBean接口，覆盖afterPropertiesSet方法。系统会自动查找afterPropertiesSet方法，执行其中的初始化操作

方法2

配置init-method,例如设置bean中init-method="init"那么在初始化过程中就会调用相应class指定类的init()方法进行初始化工作

<bean id="examInitBean" class="boy.ExamInitBean" init-method="init"/>

方法

public class ExamInitBean{
    public void init(){
        //init method
    }
}

二 销毁（与初始化类似）

方法1

实现org.springframework.beans.foctory.DisposableBean，覆盖destory方法。

方法2

方法2.配置destory-method

<bean id="examDestoryBean" class="net.boy.spring.ExamDestoryBean" init-method="cleanup"/>

方法

public class ExamDestoryBean{
    public void cleanup(){
        //cleanup method
    }
}

三 配置全局初始化、销毁方法

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd" 
        default-init-method="defautInit" default-destroy-method="defaultDestroy">
        
    
 </beans>

测试

实现类

package boy.lifecycle;

import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;

public class BeanLifeCycle implements InitializingBean, DisposableBean {
    
    public void defautInit() {
        System.out.println("Bean defautInit.");
    }
    
    public void defaultDestroy() {
        System.out.println("Bean defaultDestroy.");
    }

    @Override
    public void destroy() throws Exception {
        System.out.println("Bean destroy.");
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("Bean afterPropertiesSet.");
    }
    
    public void start() {
        System.out.println("Bean start .");
    }
    
    public void stop() {
        System.out.println("Bean stop.");
    }
    
}

测试类

packageboy.lifecycle;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.BlockJUnit4ClassRunner;

import net.boy.spring.UnitTestBase;

@RunWith(BlockJUnit4ClassRunner.class)
public class TestBeanLifecycle extends UnitTestBase {
    
    public TestBeanLifecycle() {
        super("classpath:spring-lifecycle.xml");
    }
    
    @Test
    public void test1() {
        super.getBean("beanLifeCycle");
    }
    
}

配置xml

<?xml version="1.0" encoding="UTF-8"?>
<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.xsd" 
        default-init-method="defautInit" default-destroy-method="defaultDestroy">
        
        <bean id="beanLifeCycle" class="net.boy.spring.lifecycle.BeanLifeCycle"  init-method="start" destroy-method="stop"></bean>
    
 </beans>