Making a request parameter binding case insensitive

Question

I have a requirement where I have to make requestParams to bind properly even if the cases of the param name changes. Note:I am using spring 3.2

For eg: http:/

Answer 1

You could write a servlet filter that does this. But it does need some coding work.

Here is the link to the code - http://www.acooke.org/cute/Forcinglow0.html

Something like this - in this servlet filter convert parameters to lower case

public final class LowerCaseParametersFilter implements Filter {
 @Override
public void doFilter(final ServletRequest request,
                     final ServletResponse response,
                     final FilterChain chain)
        throws IOException, ServletException {
    if (request instanceof HttpServletRequest) {
        LOG.debug("Wrapping request");
        chain.doFilter(new LowerCaseRequest((HttpServletRequest) request),
                       response);
    } else {
        LOG.warn(format("Not wrapping request: %s", request.getClass()));
        chain.doFilter(request, response);
    }
}
}

Here is the xml config - u wuld need

I did some research and found this Case-insensitive query string request paramters

   public class HttpCustomParamFilter implements Filter
  {

   private static class HttpServletRequestCustomeWrapper extends HttpServletRequestWrapper
   {
       private String[] parameterValues;

    @Override
    public String[] getParameterValues(String name)
    {
        Map localParameterMap = super.getParameterMap();

        // Handle case insensitivity of http request paramters like start, count, query, sort, filter etc.
        if (localParameterMap != null && !localParameterMap.isEmpty())
        {
            parameterValues = new String[localParameterMap.size()];
            for (String key : localParameterMap.keySet())
            {
                if (name.equalsIgnoreCase(key))
                    parameterValues = localParameterMap.get(key);
                else
                    parameterValues = null;
            }
        }
        return parameterValues;
    }