(1)springIOC容器可以管理bean的生命周期。spring允许在bean生命周期的特定点执行定制的任务。
(2)spring的IOC容器对bean的生命周期进行管理的过程:
(3)当bean设置声明了init-method和destroy-method属性,为bean指定初始化和销毁方法。
Car.java
package com.gong.spring.beans.cycle;
public class Car {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Car() {
System.out.println( "car的构造器");
}
public void init() {
System.out.println("init...");
}
public void destroy() {
System.out.println("destroy...");
}
@Override
public String toString() {
return "Car [name=" + name + "]";
}
}
beans-cycle.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">
<bean id="car" class="com.gong.spring.beans.cycle.Car" init-method="init"
destroy-method="destroy">
<property name="name" value="baoma"></property>
</bean>
</beans>
Main.java
package com.gong.spring.beans.cycle;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
public static void main(String[] args) {
//1.创建spring的IOC容器对象
ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans-cycle.xml");
//2.从容器中获取Bean实例
Car car = (Car) ctx.getBean("car");
System.out.println(car.toString());
ctx.close();
}
}
输出: