前面都说到了springboot中应用servlet和filter，本文继续说springboot应用监听器Listener，大体上是和之前差不多的应用。

一.HttpSessionListener

package com.maxbill.core.webbox.listener;

/** * @功能 * @作者 zuoshuai(MaxBill) * @日期 2017/7/6 * @时间 15:27 * @备注 MyHttpSessionListener */

import org.apache.log4j.Logger;

import javax.servlet.annotation.WebListener; import javax.servlet.http.HttpSessionEvent; import javax.servlet.http.HttpSessionListener;

@WebListener public class MyHttpSessionListener implements HttpSessionListener {

Logger log = Logger.getLogger(MyServletContextListener.class);

@Override
public void sessionCreated(HttpSessionEvent se) {
    log.info(">>>>>>>>>session被创建>>>>>>>>>");
}

@Override
public void sessionDestroyed(HttpSessionEvent se) {
    log.info(">>>>>>>>session被销毁>>>>>>>>>");
}

}

二.ServletContextListener

package com.maxbill.core.webbox.listener;

import com.maxbill.core.webbox.filter.MyFilter; import org.apache.log4j.Logger;

import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; import javax.servlet.annotation.WebListener;

/** * @功能 自定义监听器 * @作者 zuoshuai(MaxBill) * @日期 2017/7/6 * @时间 15:24 * @备注 MyServletContextListener */ @WebListener public class MyServletContextListener implements ServletContextListener {

Logger log = Logger.getLogger(MyServletContextListener.class);

@Override
public void contextInitialized(ServletContextEvent arg) {
    log.info(">>>>>>>>>ServletContex初始化>>>>>>>>>");
}

@Override
public void contextDestroyed(ServletContextEvent arg) {
    log.info(">>>>>>>>>ServletContex销毁>>>>>>>>>");
}

}

三.增加注解

1.在监听器上增加@WebListener

@WebListener public class MyHttpSessionListener implements HttpSessionListener {...}

@WebListener public class MyServletContextListener implements ServletContextListener {...}

2.然后在启动类中增加@ServletComponentScan，使项目中的Listener能够被扫描到

package com.maxbill;

import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.web.servlet.ServletComponentScan;

@ServletComponentScan @SpringBootApplication public class MaxbillApplication {

public static void main(String\[\] args) {
    SpringApplication.run(MaxbillApplication.class, args);
}

}

启动项目测试：

INFO com.maxbill.core.webbox.listener.MyServletContextListener:24 - >>>>>>>>>ServletContex初始化>>>>>>>>>