TestHttpSessionAttributeListener

 

 

HttpSessionAttributeListener 和 HttpSessionListener

 

1. HttpSessionAttributeListener 当session里的属性发生Add,Removed,Replaced时,tomcat会自动调用相应方法

 

2. HttpSessionListener 当session被create 和 Destroyed时,tomcat会自动调用相应方法

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public class TestHttpSessionAttributeListener implements

  HttpSessionAttributeListener {
 
 public void attributeAdded(HttpSessionBindingEvent se) {

  System.out.println("TestHttpSessionAttributeListener-->>>attributeAdded()");
  System.out.println("name=====" + se.getName());
  System.out.println("value=====" + se.getValue());

  if ("user_info".equals(se.getName())) {
      Integer count = (Integer)se.getSession().getServletContext().getAttribute("count");

      if (count == null) {
          count = 1;
      }else {
       count++;
      }
      se.getSession().getServletContext().setAttribute("count", count);
  }

   }

 

 public void attributeRemoved(HttpSessionBindingEvent se) {
      System.out.println("TestHttpSessionAttributeListener-->>>attributeRemoved()");
 }

 

 public void attributeReplaced(HttpSessionBindingEvent se) {
      System.out.println("TestHttpSessionAttributeListener-->>>attributeReplaced()");
 }

}

 

配置web.xml

 

<listener>

<listener-class>

ray.util.TestHttpSessionAttributeListener

</listener-class>

</listener>

 

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public class TestHttpSessionListener implements HttpSessionListener {

 public void sessionCreated(HttpSessionEvent se) {
    System.out.println("----------TestHttpSessionListener.sessionCreated()-----------");
 }

 public void sessionDestroyed(HttpSessionEvent se) {
 

 }

}