Spring-MVC的应用中，要实现类似的功能，主要是通过实现下面这些接口（任选一，至少一个即可）
一、ApplicationContextAware接口
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package org.springframework.context;import org.springframework.beans.BeansException;import org.springframework.beans.factory.Aware;import org.springframework.context.ApplicationContext;public interface ApplicationContextAware extends Aware { void setApplicationContext(ApplicationContext var1) throws BeansException;} |
二、ServletContextAware 接口
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package org.springframework.web.context;import javax.servlet.ServletContext;import org.springframework.beans.factory.Aware;public interface ServletContextAware extends Aware { void setServletContext(ServletContext var1);} |
三、InitializingBean 接口
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package org.springframework.beans.factory;public interface InitializingBean { void afterPropertiesSet() throws Exception;} |
四、ApplicationListener<ApplicationEvent> 接口
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package org.springframework.context;import java.util.EventListener;import org.springframework.context.ApplicationEvent;public interface ApplicationListener<E extends ApplicationEvent> extends EventListener { void onApplicationEvent(E var1);} |
示例程序：
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package test.web.listener;import org.apache.logging.log4j.*;import org.springframework.beans.*;import org.springframework.beans.factory.InitializingBean;import org.springframework.context.*;import org.springframework.context.event.ContextRefreshedEvent;import org.springframework.stereotype.Component;import org.springframework.web.context.ServletContextAware;import javax.servlet.ServletContext;@Componentpublic class StartupListener implements ApplicationContextAware, ServletContextAware, InitializingBean, ApplicationListener<ContextRefreshedEvent> { protected Logger logger = LogManager.getLogger(); @Override public void setApplicationContext(ApplicationContext ctx) throws BeansException { logger.info("1 => StartupListener.setApplicationContext"); } @Override public void setServletContext(ServletContext context) { logger.info("2 => StartupListener.setServletContext"); } @Override public void afterPropertiesSet() throws Exception { logger.info("3 => StartupListener.afterPropertiesSet"); } @Override public void onApplicationEvent(ContextRefreshedEvent evt) { logger.info("4.1 => MyApplicationListener.onApplicationEvent"); if (evt.getApplicationContext().getParent() == null) { logger.info("4.2 => MyApplicationListener.onApplicationEvent"); } }} |
运行时，输出的顺序如下：
1 => StartupListener.setApplicationContext
2 => StartupListener.setServletContext
3 => StartupListener.afterPropertiesSet
4.1 => MyApplicationListener.onApplicationEvent
4.2 => MyApplicationListener.onApplicationEvent
4.1 => MyApplicationListener.onApplicationEvent
注意：onApplicationEvent方法会触发多次，初始化这种事情，越早越好，建议在setApplicationContext方法中处理。
最后一步别忘了，在spring-config.xml中加入自定义的bean，如下面的例子：
<!--初始化操作的bean 在spring初始化完成的时候执行这个操作 --> <bean class="com.**.firm.fclient.web.listener.ApplicationContextListener"/>
此外还有一种方法：
写个BEAN，将要执行的操作写在构造函数里，在将这个类配置到XML里，比如配置到SPRING-MVC.XML里 <bean class="com.test.xx"> 自己的类
不过不推荐使用这种方法