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:
1 package com.myapp.core.annotation.init; 2 3 import javax.annotation.PostConstruct; 4 import javax.annotation.PreDestroy; 5 6 public class PersonService { 7 8 private String message; 9 10 public String getMessage() { 11 return message; 12 } 13 14 public void setMessage(String message) { 15 this.message = message; 16 } 17 18 @PostConstruct 19 public void init(){ 20 System.out.println("I'm init method using @PostConstrut...."+message); 21 } 22 23 @PreDestroy 24 public void dostory(){ 25 System.out.println("I'm destory method using @PreDestroy....."+message); 26 } 27 28 }
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2:定义相关的配置文件:
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 xmlns:context="http://www.springframework.org/schema/context" 5 xsi:schemaLocation="http://www.springframework.org/schema/beans 6 http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 7 http://www.springframework.org/schema/context 8 http://www.springframework.org/schema/context/spring-context-3.1.xsd"> 9 10 <!-- <context:component-scan base-package="com.myapp.core.jsr330"/> --> 11 12 <context:annotation-config /> 13 14 <bean id="personService" class="com.myapp.core.annotation.init.PersonService"> 15 <property name="message" value="123"></property> 16 </bean> 17 18 </beans>
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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:
1 package com.myapp.core.annotation.init; 2 3 import org.springframework.context.ApplicationContext; 4 import org.springframework.context.support.ClassPathXmlApplicationContext; 5 6 public class MainTest { 7 8 public static void main(String[] args) { 9 10 ApplicationContext context = new ClassPathXmlApplicationContext("resource/annotation.xml"); 11 12 PersonService personService = (PersonService)context.getBean("personService"); 13 14 personService.dostory(); 15 } 16 17 }
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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:
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 xmlns:context="http://www.springframework.org/schema/context" 5 xsi:schemaLocation="http://www.springframework.org/schema/beans 6 http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 7 http://www.springframework.org/schema/context 8 http://www.springframework.org/schema/context/spring-context-3.1.xsd"> 9 10 <!-- <context:component-scan base-package="com.myapp.core.jsr330"/> --> 11 12 <!-- <context:annotation-config /> --> 13 14 15 <bean class="org.springframework.context.annotation.CommonAnnotationBeanPostProcessor" /> 16 <bean id="personService" class="com.myapp.core.annotation.init.PersonService"> 17 <property name="message" value="123"></property> 18 </bean> 19 20 21 22 </beans>
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同样可以得到以上测试的输出结果。
时间: 2024-10-24 05:52:10