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关于在spring 容器初始化 bean 和销毁前所做的操作定义方式有三种:
第一种:通过@PostConstruct 和 @PreDestroy 方法 实现初始化和销毁bean之前进行的操作
第二种是:通过 在xml中定义init-method 和 destory-method方法
第三种是: 通过bean实现InitializingBean和 DisposableBean接口
下面演示通过 @PostConstruct 和 @PreDestory
1:定义相关的实现类:
- package com.myapp.core.annotation.init;
-
- import javax.annotation.PostConstruct;
- import javax.annotation.PreDestroy;
-
- public class PersonService {
-
- private String message;
-
- public String getMessage() {
- return message;
- }
-
- public void setMessage(String message) {
- this.message = message;
- }
-
- @PostConstruct
- public void init(){
- System.out.println("I‘m init method using @PostConstrut...."+message);
- }
-
- @PreDestroy
- public void dostory(){
- System.out.println("I‘m destory method using @PreDestroy....."+message);
- }
-
- }
2:定义相关的配置文件:
- <?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="personService" class="com.myapp.core.annotation.init.PersonService">
- <property name="message" value="123"></property>
- </bean>
-
- </beans>
其中<context:annotation-config />告诉spring 容器采用注解配置:扫描注解配置;
测试类:
- package com.myapp.core.annotation.init;
-
- import org.springframework.context.ApplicationContext;
- import org.springframework.context.support.ClassPathXmlApplicationContext;
-
- public class MainTest {
-
- public static void main(String[] args) {
-
- ApplicationContext context = new ClassPathXmlApplicationContext("resource/annotation.xml");
-
- PersonService personService = (PersonService)context.getBean("personService");
-
- personService.dostory();
- }
-
- }
测试结果:
I‘m init method using @PostConstrut....123
I‘m destory method using @PreDestroy.....123
其中也可以通过申明加载org.springframework.context.annotation.CommonAnnotationBeanPostProcessor
类来告诉Spring容器采用的 常用 注解配置的方式:
只需要修改配置文件为:
- <?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">
-
-
-
-
- <bean class="org.springframework.context.annotation.CommonAnnotationBeanPostProcessor" />
- <bean id="personService" class="com.myapp.core.annotation.init.PersonService">
- <property name="message" value="123"></property>
- </bean>
-
-
-
- </beans>
同样可以得到以上测试的输出结果。
Spring实现初始化和销毁bean之前进行的操作,三种方式
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原文地址:http://www.cnblogs.com/mybatis/p/5948314.html