usertrace.java

jsp聊天室源码

package listen;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class UserTrace implements HttpSessionBindingListener
{
   private String user_name;
   private UserList container=UserList.getInstance();
   public String getUserName()
   {
   	 return user_name;
   }  	
   public void setUserName(String name)
   {
     user_name=name;	
   }
   public void valueBound(HttpSessionBindingEvent event)
   {	
     System.out.println("bounding");
   }
   public void valueUnbound(HttpSessionBindingEvent event)
   {
      container.removeUser(user_name);	
   }
   
}