在伺服器端判斷表單是否重複提交，主要可以考慮在頁面之間通過Session共用標誌變數的方法來實現，即在用戶端版面設定Session中的標誌變數，然後在伺服器段對Session中的標誌變數進行判斷。
1.建立一個ServerTest.jsp檔案，代碼如下：
<%@ page language="java" contentType="text/html; charset=Gb2312"
pageEncoding="Gb2312"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB2312">
<title>提交頁面</title>
</head>
<%
//設定標誌變數SubmitFlag值ServerTest.jsp
session.putValue("SubmitFlag","ServerTest.jsp");
%>
<body bgcolor="#ffffff">
<form name="form_client" action="ServerSubmit.jsp">
<input type="checkbox" name="check_1" checked=true/>人在江湖
<input type="submit" name="submitok"/>
</form>
</body>
</html>
2.建立一個ServerSubmit.jsp,代碼如下：
<%@ page language="java" contentType="text/html; charset=Gb2312"
pageEncoding="Gb2312"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Gb2312">
<title>伺服器端程式</title>
<%
String PageFlag;
PageFlag=(String) session.getValue("SubmitFlag");
if(PageFlag=="Over"){
out.println("重複提交頁面！");
}else{
//設定標誌變數SubmitFlag值為Over，表示已經提交
session.putValue("SubmitFlag","Over");
out.println("正常商務邏輯處理...請等待！！！");
}
%>
</head>
<body>
</body>
</html>
3.單擊“提交查詢內容”後，單擊“後退”，再次單擊“提交查詢內容”按鈕就會提示重複提交錯誤。
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