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Jakarta Struts Cookbook
book

Jakarta Struts Cookbook

by Bill Siggelkow
February 2005
Intermediate to advanced content levelIntermediate to advanced
528 pages
12h 53m
English
O'Reilly Media, Inc.
Content preview from Jakarta Struts Cookbook

7.9. Preventing Double Form Submissions

Problem

You need to stop users from inadvertently submitting a form twice.

Solution

Use the Struts token facility to reject a duplicate request. First, as shown in Example 7-6, save a token in the HTTP request in the Action which precedes the JSP containing the form.

Example 7-6. Action that saves token

package com.oreilly.strutsckbk.ch06;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

public class SaveTokenAction extends Action {
    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        // save a token
        saveToken(request);

        // load the data to view
        BusinessService.loadData( );
        
        return mapping.findForward("success");
    }
}

You don't have to make any changes to the JSP that displays the form as long as you create the form using the html:form tag (as shown in Example 7-7).

Example 7-7. JSP page for token handling

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>

<html>
<head>
  <title>Struts Cookbook - Chapter 7 : Token Test</title> </head> <body bgcolor="white"> <h2>Token Test</h2> <html:errors/> <html:form action="/SaveData"> <html:text property="name"/> <html:submit/> ...
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Publisher Resources

ISBN: 059600771XSupplemental ContentErrata Page