用户浏览器关闭cookie处理方法

function getSessionId(){
var c_name = "jsessionid";
//	alert("cookie:"+document.cookie + "     " + window.location.href );
var hrefStr = window.location.href;
if(hrefStr.length > 0){
c_start = hrefStr.indexOf(c_name + "=")
if(c_start != -1){
c_start = c_start + c_name.length+1 ;
c_end = hrefStr.indexOf("?",c_start)
if(c_end == -1)
c_end = hrefStr.length;
return  hrefStr.substring(c_start,c_end);
}
}
}

<form action=<s:url  action="user/login" />  method="post" id = "fromBut">
　　<input type="hidden" name="user" value="" id="users">
</form>

<a href =
　　<s:url  action="user/userlogin" >
<s:param name="user.userId" value="%{user.userId}" />
　　</s:url>
>登录</a>