JSP之监听器Listener(二)

 1 package com.huayu.listener;
 2 
 3 import javax.servlet.ServletContextAttributeEvent;
 4 import javax.servlet.ServletContextAttributeListener;
 5 import javax.servlet.annotation.WebListener;
 6 @WebListener
 7 public class Listener3 implements ServletContextAttributeListener{
 8     
 9     @Override
10     public void attributeAdded(ServletContextAttributeEvent event) {
11         String named=event.getName().toString();
12         String value=event.getValue().toString();
13         System.out.println("application中添加了一个"+named+"变量值为"+value);
14         
15     }
16 
17     @Override
18     public void attributeRemoved(ServletContextAttributeEvent event) {
19         String named=event.getName().toString();
20         String value=event.getValue().toString();
21         System.out.println("application中添移除一个"+named+"变量值为"+value);
22         
23         
24         
25     }
26 
27     @Override
28     public void attributeReplaced(ServletContextAttributeEvent event) {
29         String named=event.getName().toString();
30         String value=event.getValue().toString();
31         System.out.println("application中"+named+"变量值变为"+value);
32     }
33 
34 }

 1 package com.huayu.listener;
 2 
 3 import javax.servlet.ServletRequest;
 4 import javax.servlet.ServletRequestAttributeEvent;
 5 import javax.servlet.ServletRequestAttributeListener;
 6 import javax.servlet.ServletRequestEvent;
 7 import javax.servlet.ServletRequestListener;
 8 import javax.servlet.annotation.WebListener;
 9 import javax.servlet.http.HttpServletRequest;
10 @WebListener
11 public class Listener4 implements ServletRequestListener,ServletRequestAttributeListener{
12 
13     @Override
14     public void requestDestroyed(ServletRequestEvent arg0) {
15 
16         HttpServletRequest request=(HttpServletRequest) arg0.getServletRequest();
17         System.out.println("---发向"+request.getRequestURI()+"请求被销毁-----");
18         
19     }
20 
21     @Override
22     public void requestInitialized(ServletRequestEvent arg0) {
23         HttpServletRequest request=(HttpServletRequest) arg0.getServletRequest();
24         System.out.println("---发向"+request.getRequestURI()+"请求被初始化-----");
25     }
26 
27     @Override
28     public void attributeAdded(ServletRequestAttributeEvent arg0) {
29             ServletRequest request=arg0.getServletRequest();
30             String name=arg0.getName();
31             String value=arg0.getValue().toString();
32             System.out.println(request+"范围内添加了名为"+name+"值为"+value+"的属性");
33         
34     }
35 
36     @Override
37     public void attributeRemoved(ServletRequestAttributeEvent arg0) {
38         ServletRequest request=arg0.getServletRequest();
39         String name=arg0.getName();
40         String value=arg0.getValue().toString();
41         System.out.println(request+"范围内添加了名为"+name+"值为"+value+"的属性被删除");
42         
43     }
44 
45     @Override
46     public void attributeReplaced(ServletRequestAttributeEvent arg0) {
47         ServletRequest request=arg0.getServletRequest();
48         String name=arg0.getName();
49         String value=arg0.getValue().toString();
50         System.out.println(request+"范围内添加了名为"+name+"值为"+value+"的属性被替换了");
51         
52     }
53 
54 }