listener 监听 tomcat 容器的初始化和销毁

 1 public class TestServletContextListener implements ServletContextListener
 2 {
 3 
 4     @Override
 5     public void contextDestroyed(ServletContextEvent e)
 6     {
 7         System.out.println("--event--  context destoryed..");
 8         e.getServletContext().log("ssseeevvv");
 9         System.out.println(e.getServletContext().getAttribute("count"));
10         
11 //        System.out.println(ActionContext.getContext().getApplication().get("count")); //获取不到 ActionContext
12     }
13 
14     @Override
15     public void contextInitialized(ServletContextEvent evt)
16     {
17         System.out.println("--event--  context initialized..");
18         ServletContext ctx = evt.getServletContext();
19         
20         if(null == ctx.getAttribute("count"))
21         {
22　　　　　　　　ctx.setAttribute("count",0); //为了简单起见，我就数数了
23             //ctx.setAttribute("count", new HashMap<String,Set<String>>());
24         }
25     }
26 
27 }

 1 public class TestInterceptor extends MethodFilterInterceptor
 2 {
 3     private static final long serialVersionUID = 1L;
 4 
 5     @Override
 6     protected String doIntercept(ActionInvocation invocation) throws Exception
 7     {
 8         System.out.println("-m- Enter into TestInterceptor...");
 9         countActionRequestNumber();
10         
11         invocation.invoke(); //一定要有这一句，不然请求走到这个拦截器之后就断了
12         return null;
13     }
14     
15     private void countActionRequestNumber()
16     {
17         //方式二： Spring 的listener是从ServletContext中获取的 getInitParameter 
18         ServletContext servletContext = ServletActionContext.getServletContext();
19         String parameter = servletContext.getInitParameter("test");
20         
21         if(Boolean.valueOf(parameter))
22         {
23             int count = (int)servletContext.getAttribute("count");
24             servletContext.setAttribute("count", ++count);
25         }
26     }
27 }

1 　　<context-param>
2         <param-name>test</param-name>
3         <param-value>true</param-value>
4     </context-param>
5     
6     <listener>
7         <listener-class>test.listener.TestServletContextListener</listener-class>
8     </listener>

 1 　　<package name="one" extends="struts-default">
 2         
 3         <interceptors>
 4             <interceptor name="test" class="test.interceptor.TestInterceptor"></interceptor>
 5             <interceptor-stack name="selfDefaultIntcptorStack">
 6                 <interceptor-ref name="test"></interceptor-ref>
 7                 <interceptor-ref name="defaultStack"></interceptor-ref>
 8             </interceptor-stack>
 9         </interceptors>
10         
11         <default-interceptor-ref name="selfDefaultIntcptorStack"></default-interceptor-ref>
12         
13         <action name="test1" class="test.action.TestAction" method="test1">
14         </action>
15         <action name="test2" class="test.action.TestAction" method="test2">
16         </action>
17         
18     </package>