Question

I have a payment form. When user submit the form the payment process runs successfully, but clicking the back button brings user to same form. I want to expire the form after successful submission, to prevent user from multiple payment (in case user goes back and submit form).
Following Prevent user from going back tutorial, I added the filter but it’s not working for me. What am I doing wrong? Here is what I added for filtering.

<filter>
    <filter-name>paymentFilter</filter-name>
    <filter-class>path to PaymentFilter class</filter-class>
</filter>
<filter-mapping>
    <filter-name>paymentFilter</filter-name>
    <url-pattern>/order/*/payment</url-pattern>
</filter-mapping>

and my filter class is

public class PaymentFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub          
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {

        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        httpServletResponse.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1.
        httpServletResponse.setHeader("Pragma", "no-cache"); // HTTP 1.0.
        httpServletResponse.setDateHeader("Expires", 0); // Proxies.
        System.out.println("In filter");            
    }

    @Override
    public void destroy() {
        // TODO Auto-generated method stub          
    }

}

I have added a System.out.println("In filter") but I can’t see its output (“In filter”) on console after running the page.

When I use the URL pattern as /* the System.out prints on console,

<url-pattern>/*</url-pattern> (it works as expected)

but when I change the URL pattern to /order/*/payment (* is order id what changes for each order). then System.out does not print anything on console.

<url-pattern>/order/*/payment</url-pattern> (it doesn't work)

I am using spring mvc, apache, tomcat7.0

Answer 1

What gave me the solution to my problem is that i “can not” user regular expression in my url-patter for filter mapping. * can only be use as suffix or prefix.