chatmessage.java

JSP+AJAX开发的聊天室(毕业设计)

package org.yeeku.service;
import javax.servlet.ServletContext;
import java.util.*;
public class ChatMessage
  {
    int MaxMessage=100;
    int LessMessage=50;
    public void setMaxMessage(int MaxMessage)
	{
		this.MaxMessage = MaxMessage;
	}
	public int getMaxMessage()
	{
		 return this.MaxMessage;
	}
    public void setLessMessage(int LessMessage)
	{
		this.LessMessage = LessMessage;
	}
	public int getLessMessage()
	{
		 return this.LessMessage;
	}

   public void addToChatmsg(String msg,ServletContext m_application)
      {
		List chatmsg;
		if(m_application.getAttribute("chatmsg")==null){
			chatmsg=new ArrayList();
		}
		else{
			chatmsg=(List)m_application.getAttribute("chatmsg");
		    }
                chatmsg.add(msg);
		if(chatmsg.size()>MaxMessage){
		for(int j=chatmsg.size()-LessMessage-1;j>=0;j--)
			chatmsg.remove(j);
                                              }
                m_application.setAttribute("chatmsg",chatmsg);
     }
   public void addToPersonalChat(String toname,String msg,ServletContext m_application)
      {
		List personalmsg;
		if(m_application.getAttribute(toname)==null){
			personalmsg=new ArrayList();
		}
		else{
			personalmsg=(List)m_application.getAttribute(toname);
		    }
                personalmsg.add(msg);
		if(personalmsg.size()>MaxMessage){
		for(int j=personalmsg.size()-LessMessage-1;j>=0;j--)
			personalmsg.remove(j);
                                              }
                m_application.setAttribute(toname,personalmsg);
     }

 }