@PostConstruct和@PreConstruct注解实现Spring been的初始化和销毁

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1.@PostConstruct说明

被@PostConstruct修饰的方法会在服务器加载Servlet的时候运行，并且只会被服务器调用一次，类似于Serclet的inti()方法。被@PostConstruct修饰的方法会在构造函数之后，init()方法之前运行。

2.@PreConstruct说明

被@PreConstruct修饰的方法会在服务器卸载Servlet的时候运行，并且只会被服务器调用一次，类似于Servlet的destroy()方法。被@PreConstruct修饰的方法会在destroy()方法之后运行，在Servlet被彻底卸载之前。

(1)测试类：PostConstructTest.java

package com.aruisi.test;import javax.annotation.PostConstruct;import javax.annotation.PreDestroy;public class PostConstructTest {private String  message;        public String getMessage() {          return message;      }        public void setMessage(String message) {          this.message = message;      }            @PostConstruct      public void  init(){          System.out.println("@PostConstrut...."+message);      }            @PreDestroy      public void  dostory(){          System.out.println("@PreDestroy....."+message);      }  }

(2)配置文件：annotation.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"  xmlns:context="http://www.springframework.org/schema/context"  xsi:schemaLocation="http://www.springframework.org/schema/beans  http://www.springframework.org/schema/beans/spring-beans-3.1.xsd  http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-3.1.xsd">      <context:annotation-config />    <bean id="postConstructTest" class="com.aruisi.test.PostConstructTest">    <property name="message" value="day day up"></property>  </bean>    </beans>

(3)测试方法：

package com.aruisi.test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class MainTest {@SuppressWarnings("resource")public static void main(String[] args) {ApplicationContext  context = new ClassPathXmlApplicationContext("myTest/annotation.xml");  PostConstructTest   personService  =  (PostConstructTest)context.getBean("postConstructTest");          personService.dostory();}}

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