DWR 实现单向聊天【二：页面显示】 功能登录显示登录用户【无数据库操作】

一：jsp（显示层代码块）如下：

  index.jsp
  <script type="text/javascript" src="/dwr-comet/js/jquery/jquery- 1.2.6.pack.js">
</script>
  <script type="text/javascript" src="/dwr-comet/dwr/interface/myjs.js">
  </script>
  <script type="text/javascript" src="/dwr-comet/dwr/engine.js">
  </script><script type="text/javascript" src="/dwr-comet/dwr/util.js">
  </script> 

聊天页面显示 代码如下:

 <script> 
 function login() 
{ var from = jQuery("#username").val(); 
if (from=="") 
{ alert("请输入用户名"); retun; 
} 
myjs.login(jQuery("#username").val(),
function(x){ 
if (!x) document.getElementById("loginmsg").innerHTML = "登陆成功"; else document.getElementById("loginmsg").innerHTML = "用户已在别处登陆"; }); 
} 
//添加用户列表 
function addUser(arry) 
{ var from = jQuery("#username").val(); if (jQuery.trim(from)=="" || arry.length==0) return; dwr.util.removeAllOptions("users"); dwr.util.addOptions("users", arry,"id","name"); 
} 
//发送 function send() 
{ var from = jQuery("#username").val(); var toId = jQuery("#users").val(); var toName = jQuery("#users>option:selected").html(); var msg = jQuery("#text").val(); var time = new Date(); myjs.sendMsg(toId,toName,msg,function(x)
{ if (x) { var mm = document.getElementById("msg"); var f = document.createElement("div"); f.innerHTML = "<font color=red>("+time.toLocaleString()+")"+from+"对"+toName+"说:"+ ")</font><br>"; mm.appendChild(f); var m = document.createElement("div"); m.innerHTML = msg+"<br><br>"; mm.appendChild(m); } });
 } //接收消息
 function recv(from,to,msg,time) { 
var mm = doc
ument.getElementById("msg"); var f = document.createElement("div"); f.innerHTML = "<font color=red>"+time.toLocaleString()+from+"对"+to+"说"+ "</font><br>"; mm.appendChild(f); var m = document.createElement("div"); m.innerHTML = msg+"<br><br>"; mm.appendChild(m); 
} 
//退出事件 
window.onbeforeunload = function(){ jQuery.post("ExitGameServlet"); } </script>