Spring阶段性学习总结（六）Bean的生命周期

 1 package SpringBeansCycle;
 2 
 3 public class Car {
 4     private String brand;
 5 
 6     public Car() {
 7         System.out.println("我是一个构造器");
 8     }
 9 
10     public void init() {
11         System.out.println("this is a init!");
12     }
13 
14     public void destory() {
15         System.out.println("this is a destory!");
16     }
17 
18     public String getBrand() {
19         return brand;
20     }
21 
22     public void setBrand(String brand) {
23         this.brand = brand;
24     }
25 
26 }

 1 package SpringBeansCycle;
 2 
 3 import org.springframework.beans.BeansException;
 4 import org.springframework.beans.factory.config.BeanPostProcessor;
 5 
 6 public class MyBeanPostProcesser implements BeanPostProcessor {
 7 
 8     @Override
 9     public Object postProcessBeforeInitialization(Object o, String s) throws BeansException {
10         System.out.println(s);
11         return o;
12     }
13 
14     @Override
15     public Object postProcessAfterInitialization(Object o, String s) throws BeansException {
16         System.out.println("postProcessAfterInitialization");
17         return o;
18     }
19 }

 1 package SpringBeansCycle;
 2 
 3 import org.springframework.context.support.ClassPathXmlApplicationContext;
 4 
 5 public class Main {
 6     public static void main(String[] args) {
 7         ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("SpringBeansCycle/beans-cycle.xml");
 8         Car car = (Car) ctx.getBean("car");
 9         System.out.println(car);
10         //关闭IOC容器
11         ctx.close();
12     }
13 }

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
 5         <!--定义一个类实现BeanPostProcessor类之后可以在配置文件中，配置只有class的bean然后在调用实例类的初始化方法的时候，会对该类进行前后的调用-->
 6             <bean id="car" class="SpringBeansCycle.Car"
 7                   init-method="init" destroy-method="destory">
 8                 <property name="brand" value="#{'宝马'}"></property>
 9             </bean>
10             <bean class="SpringBeansCycle.MyBeanPostProcesser"></bean>
11 
12 </beans>