解决Struts重复提交的问题

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Struts Bean HTML Apache Cache

首先必须要通过一个Action再转向那个添加记录的页面,转向函数如下.

 public ActionForward tokenTest(
   ActionMapping mapping,
   ActionForm form,
   HttpServletRequest request,
   HttpServletResponse response) throws Exception {
  saveToken(request);//把一个token ID保存到Session,并在且要转到的页面
       //的<html:form>中添加一个<input type="hideen">的标答.
  return mapping.findForward("add");
 }


一个输出入页面如容如下:

<%@ page language="java" pageEncoding="UTF-8"%>

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html lang="true">
  <head>
    <html:base />
    
    <title>tokentest.jsp</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
  </head>
  
  <body>
      <br>
      <logic:present name="error">
         <pre style="color:#ff2255"><bean:write name="error"/></pre>
      </logic:present>
      <center>
      <html:form action="/insert.do" method="post">
        <table border="0" cellspacing="0" >
          <tr>
            <td width="30%">用户名</td>
            <td width="70%"><html:text property="username"/></td>
          </tr>
          <tr>
            <td>地址:</td>
            <td><html:text property="address"/></td>
          </tr>
          <tr>
            <td colspan="2"><html:submit value="提交"/></td>
          </tr>
        </table>
       </html:form>
      </center>
  </body>
</html:html>
页面的处理Action内容如下:
   public ActionForward execute(
  ActionMapping mapping,
  ActionForm form,
  HttpServletRequest request,
  HttpServletResponse response) {
  TokenTestForm tokenTestForm = (TokenTestForm) form;
  if(!isTokenValid(request)){ //重复提交
   request.setAttribute("error","不能得复提交!!!");
   //saveToken(request); 重新生成tokenid,
   return mapping.findForward("return");
  }else{
   resetToken(request);
  }
  //执行相关操作
  System.out.println(tokenTestForm.getUsername()+"--"+tokenTestForm.getAddress());
  return mapping.findForward("ok");
 }

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