通过Spring @PostConstruct 和 @PreDestroy 方法 实现初始化和销毁bean之前进行的操作
2016-07-16 13:55
736 查看
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:
[java] view
plain copy
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:
[html] view
plain copy
<?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:component-scan base-package="com.myapp.core.jsr330"/> -->
<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:
[java] view
plain copy
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:
[html] view
plain copy
<?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:component-scan base-package="com.myapp.core.jsr330"/> -->
<!-- <context:annotation-config /> -->
<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。
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:
[java] view
plain copy
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:
[html] view
plain copy
<?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:component-scan base-package="com.myapp.core.jsr330"/> -->
<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:
[java] view
plain copy
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:
[html] view
plain copy
<?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:component-scan base-package="com.myapp.core.jsr330"/> -->
<!-- <context:annotation-config /> -->
<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。
相关文章推荐
- struts2中getOutputStream() has already been called for this response异常解决方法
- Java - 死锁
- JAVA中等待事件时的一点小疑问的笔记
- java中内存分配以及static的用法
- Java虚拟机4:内存溢出
- IDEA快捷键对比Eclipse
- Eclipse插件checkstyle安装使用
- 也谈BIO | NIO | AIO (Java版)
- Java虚拟机3:常用JVM命令参数
- Java虚拟机2:Java内存区域及对象
- Java中实现文件上传下载的三种解决方案
- hibernate生成表中有BLOB字段的javabean,hql查询出现无效列类型异常
- Java NIO VS IO
- java模拟getpost请求
- struts2环境搭建
- Java中的equals 和hashCode的理解
- struts2进阶篇(4)
- Spring MVC入门之编写HelloWorld
- javaSE学习笔记——接口
- eclipse注释模板