freshlist.java

JSP+AJAX开发的聊天室(毕业设计)

package org.yeeku.refresh;
import org.directwebremoting.WebContext;    
import org.directwebremoting.WebContextFactory;
import java.util.*;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpSession;

public class FreshList
   {
     
     public List execute() throws Exception
         {
           WebContext ctx;
           ctx=WebContextFactory.get();
           HttpSession session =ctx.getSession();
           String UserName=(String)session.getAttribute("username");   
           ServletContext M_application=ctx.getServletContext();
           List chatUsers;
           chatUsers=(List)M_application.getAttribute("chatUser");
           List Userreturn=new ArrayList();
           if(chatUsers!=null)
             {
                List temporaryuser=new ArrayList();
                List temporary=new ArrayList();
                List checkuser=new ArrayList();
                for(int i=0;i<=chatUsers.size()-1;i++)
                 {              
                   String onlineName=(String)chatUsers.get(i);
	           checkuser=(List)M_application.getAttribute(onlineName);
                   String firstuser=(String)checkuser.get(0);
                   if(firstuser.equals("请等待对方回复") && onlineName.equals(UserName))
                         {
                           temporaryuser.add(onlineName);
                         }
                   else if(!(firstuser.equals("请发送消息")))
                         {
                            temporary.add(onlineName);
                         }
                   else
                         {
                           Userreturn.add(onlineName);
                         }
                   }
                  String username="forsureuser";//分界线
                  Userreturn.add(username);
                  int k;
                  for(k=0;k<=temporaryuser.size()-1;k++)
                   {              
                     String chatingName=(String)temporaryuser.get(k);
                     Userreturn.add(chatingName);
                   }
                  username="chatinguser";//分界线
                  Userreturn.add(username);
                  for(k=0;k<=temporary.size()-1;k++)
                   {              
                     String chatingName=(String)temporary.get(k);
                     Userreturn.add(chatingName);
                   }    
                }
               if(Userreturn==null)
               {
                  String user="No UserOnline";
                  chatUsers.add(user);
               }
               return Userreturn;
            }
        	
  }