Spring容器生命周期中如前置运行程序和后置运行程序

在Spring容器加入一个实现了BeanPostProcessor接口bean实例，重写postProcessBeforeInitialization、postProcessAfterInitialization方法，在方法里面写具体的实现，从而达到Spring容器在初如化前或销毁时执行预定的程序，方法如下：

1、pop.xml导包

<dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.3.37</version>
</dependency>
<dependency>

2、写一个类实现BeanPostProcessor接口，同时写一个User实体类用于测试
实现类：

package test.spring.model;import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;public class LifeBeanAware implements BeanPostProcessor {@Overridepublic Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {// TODO Auto-generated method stubSystem.out.println("前置处理");return null;}@Overridepublic Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {// TODO Auto-generated method stubSystem.out.println("后置处理");return null;}}

User类：

/**
*Description:
*author: ljd
*@date 2024年7月2日 
*@version 1.0 
*/
package test.spring.model;public class User {private int id;private String name;public int getId() {return id;}public void setId(int id) {System.out.println("user赋值");this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public void testPrint() {System.out.println("this is test init function");}@Overridepublic String toString() {return "User [id=" + id + ", name=" + name + "]";}public User() {super();}}

3、applicationContext.xml配置

<?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="user1" init-method="testPrint" destroy-method="testPrint" class="test.spring.model.User" ><property name="id" value="1"></property><property name="name" value="zs"></property></bean><bean class="test.spring.model.LifeBeanAware"></bean>
</beans>

4、测试结果

/**
*Description:
*author: ljd
*@date 2024年7月2日 
*@version 1.0 
*/
package testSpring;import org.junit.Test;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;import test.spring.model.User;public class TestSpring {@Testpublic void testUser() {ConfigurableApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");User user=ac.getBean(User.class); System.out.println(user);ac.close();}}