用戶端（Javascript）、
思想1：點完提交按鈕就將按鈕設定成disable，缺點在於要對頁面中的每個按鈕都設定
思想2：用一個全域變數來表示瀏覽器是否已提交
<html>
<head>
<script language="javascript">
var submited = false;
function checkValid(form)
{
if(submited) return false;
submited = true;
return true;
}
</script>
</head>
<body>
<form method="post" onsubmit="return checkValid(this);">
<input type="submit" value="Submit">
</form>
</body>
伺服器端（Struts Token）
1.在某個Action中建立令牌 saveToken(request)
2.頁面上使用<html:form>或<html:link transaction="true">都會產生令牌,如果不想使用struts標籤，可以用name為org.apache.struts.taglib.html.TOKEN的隱藏欄位
3.在提交的Action中判斷令牌
if(isTokenValid(request))
{
resetToken(request);
//....進行業務處理
}
else
//提示，不能重複提交
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