token防刷新

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@page import="org.apache.struts.Globals"%>
<%@page import="org.apache.struts.taglib.html.Constants"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="html" uri="http://struts.apache.org/tags-html" %>
<%@ page isELIgnored="false" %>
<!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=UTF-8">
<title>首页</title>
</head>
<body>
<%-- <html:form action="helloMsg.do" method="post">
<html:text property="msg"></html:text>
<!-- <input type="submit" name="method" value="show"/> -->
<html:submit property="method" value="show"></html:submit>
</html:form> --%>

<form action="${pageContext.request.contextPath }/helloMsg.do" method="post">
<input type="text" name="msg">
<input type="hidden" name="<%= Constants.TOKEN_KEY%>" value="<%= session.getAttribute(Globals.TRANSACTION_TOKEN_KEY)%>">
<input type="submit" name="method" value="show"/>
</form>
</body>
</html>


public ActionForward show(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {

if(this.isTokenValid(request, true)){
System.out.println("表单不是重复提交");
request.setAttribute("helloWorld", request.getParameter("msg"));
request.setAttribute("helloWorld", request.getParameter("msg"));
return mapping.findForward("success");
}else{
System.out.println("表单重复提交");
saveToken(request);
return mapping.findForward("input");
}
}

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