Spring框架中Bean的生命周期
Spring框架提供了类似于C++中构造函数和析构函数的支持，分别叫做初始化方法和销毁方法。
初始化方法在对象创建制后并且完成了依赖注入之后调用的
销毁方法是在对象被容器销毁的时候创建的，开进行资源的释放工作。
首先我们创建一个Bean。
这个Bean创建了两个方法init()和destroy()方法，分别是用来做初始化方法和销毁方法。
qiudawei115.lifeCycle. LifeCycleBean.java
package qiudawei115.lifeCycle;
public class LifeCycleBean {
String message;
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public void init(){
System.out.println("LifeCycleBean对象初始化...");
System.out.println(this.getMessage());
}
public void destroy(){
System.out.println("LifeCycleBean对象被销毁...");
message="GoodBye World!";
}
}
在配置文件applicationContext.xml修改如下,红色字体为新添加：
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-2.0.xsd">
<bean id="helloWorld" class="qiudawei115.base.HelloWorld">
<property name="message" value="Hello World!">property>
bean>
<bean id="fb" class="qiudawei115.constructor.FirstBean">bean>
<bean id="sb" class="qiudawei115.constructor.SecondBean">bean>
<bean id="cb" class="qiudawei115.constructor.ConstructorBean">
<constructor-arg>
<ref bean="fb"/>
constructor-arg>
<constructor-arg>
<ref bean="sb"/>
constructor-arg>
bean>
<bean id="sfb" class="qiudawei115.setter.FirstBean">bean>
<bean id="ssb" class="qiudawei115.setter.SecondBean">bean>
<bean id="setterBean" class="qiudawei115.setter.SetterBean">
<property name="sfb" ref="sfb">property>
<property name="ssb" ref="ssb">property>
bean>
<bean id="pb" class="qiudawei115.lookUp.PrototypeBean" scope="prototype">bean>
<bean id="lsb" class="qiudawei115.lookUp.SingletonBean" >
<property name="pb" ref="pb">property>
<lookup-method name="getPrototypeBean" bean="pb"/>
bean>
beans>
测试Bean
qiudawei115.lifeCycle. LifeCycleBeanMain.java
package qiudawei115.lifeCycle;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
public class LifeCycleBeanMain {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
ClassPathResource resource=new ClassPathResource("applicationContext.xml");
XmlBeanFactory beanFactory=new XmlBeanFactory(resource);
LifeCycleBean lcb=(LifeCycleBean)beanFactory.getBean("lcb");
//System.out.println(lcb.getMessage());
//lcb.destroy();
beanFactory.destroySingletons();
System.out.println(lcb.getMessage());
}
}
输出结果为：
LifeCycleBean对象初始化...
Hello World!
LifeCycleBean对象被销毁...
GoodBye World!
这就是Spring中Bean的生命周期。