谁和我说说application的作用

<HTML>
<HEAD>
<%@ page session="true" %>
<%@ page contentType="text/html;charset=gb2312" %>
<META http-equiv="refresh" content="3">
<script language="JavaScript">
function scrollchange()
{
        parent.mainFrame.window.scroll(0,60000);
parent.mainFrame.document.bgColor="#ffffff";
        return true;
  }
</script>
<TITLE>
outputMessage
</TITLE>
</HEAD>
<BODY onload="scrollchange()" bgcolor="#FFFFFF">
<%@ page import="java.util.*" %> <%@ page import="java.io.*" %> <%@ page import="javax.servlet.*" %>
<%@ page import="javax.servlet.http.*" %>
<FORM method="post">
<%
      String str1=new String("<font color=orage><b>[你对]</b></font>");
      String str2=new String("<font color=orage><b>[对你]</b></font>");
      String str3=new String("<font color=orage>[私聊]</font>");
      String str4=new String("<br>");
      String str5=new String("<font color=orage><b>[对]</b></font>");
      String Name =(String)session.getValue("name");
        if(Name==null)
  Name=new String("noname");
  Name =new String(Name.getBytes("iso-8859-1"),"GBK");
         %>
    <%
       Integer MessageIndex =(Integer)session.getValue("MessageIndex");
      if((MessageIndex==null )||( MessageIndex.intValue() >= 200 ))
            MessageIndex=new Integer(0);
      else
            MessageIndex=new Integer(MessageIndex.intValue());%>
<%
    synchronized(application)
    {
        String alone=new String("yes");
        Vector DisplayMessage=new java.util.Vector();
        DisplayMessage =(Vector)application.getAttribute("Message");        if(DisplayMessage !=null)
{
       if(DisplayMessage.size()< MessageIndex.intValue())
          {
  MessageIndex=new Integer(DisplayMessage.size());
  }
   if(MessageIndex.intValue()!= DisplayMessage.size())
    {
               for(int i=MessageIndex.intValue();i<DisplayMessage.size()-1;i=i+4)
                {                int     aloneindex=i;
                int     nameindex=i+1;
                int     talkwithindex=i+2;
                String  Messagestr= (String)DisplayMessage.get(i+3);
                String  alonetag  = (String)DisplayMessage.get(aloneindex);
if(alonetag==null)
    alonetag=new String("all");                String  nametag =  (String)DisplayMessage.get(nameindex);
              nametag =new String(nametag.getBytes("iso-8859-1"),"GBK");
                String  talkwithtag =(String)DisplayMessage.get(talkwithindex);
    talkwithtag =new String(talkwithtag.getBytes("iso-8859-1"),"GBK");          if(alonetag.compareTo(alone)==0)
                   {
                    if(nametag.compareTo(Name)==0)
                         {
                           Messagestr=str3+str1+talkwithtag+Messagestr+str4;                          %>
                       <script language="JavaScript">
                                 parent.mainFrame.document.write("<%= Messagestr%>")
                       </script>
                       <%                            }                      if((talkwithtag.compareTo(Name)==0))
                       {
                          Messagestr=str3+nametag+str2+Messagestr+str4;
                          %>
                       <script language="JavaScript">
                                 parent.mainFrame.document.write("<%= Messagestr%>")
                       </script>
                       <%
                        }                   }
                 else
                   {        if(nametag.compareTo(Name)==0)
                         {
                           Messagestr=str1+talkwithtag+Messagestr+str4;                       %>
                       <script language="JavaScript">
                                 parent.mainFrame.document.write("<%= Messagestr%>")
                       </script>
                        <%
                            }                         else if((talkwithtag.compareTo(Name)==0))
                         {
                          Messagestr=nametag+str2+Messagestr+str4;                              %>
                        <script language="JavaScript">
                                 parent.mainFrame.document.write("<%= Messagestr%>")
                        </script>
                        <%
                          }
        else                          {
           Messagestr= nametag+str5+talkwithtag+Messagestr+str4;                                %>
                          <script language="JavaScript">
                                 parent.mainFrame.document.write("<%= Messagestr%>")
                           </script>
                            <%
                            } }      Integer count=new Integer(i+4);      session.putValue("MessageIndex",count);     }
       }
   }
else
     out.println("Welcome to here!");    }
    %>
</form>
</body>
</html>

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谁和我说说application的作用

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