Spring mvc. case insensitive get parameters mapping

Question

according this answer I try to write my code:

pojo:

class MyBean{

    public String getValueName() {
        return valueName;
    }

    public void          


        

Answer 1

Here is what you can do...

Create the domain(POJO) with all lowercase variables

public class MyBean{
    private String valuename;

    public String getValuename() {
        return valuename;
    }

    public void setValuename(String valuename) {
        this.valuename = valuename;
    }
}

Then create a class which will extend HttpServletRequestWrapper

public class CustomWrappedRequest extends HttpServletRequestWrapper
{
    private final Map modifiableParameters;
    private Map allParameters = null;

    public CustomWrappedRequest(final HttpServletRequest request, 
                                                    final Map additionalParams)
    {
        super(request);
        modifiableParameters = new TreeMap();
        modifiableParameters.putAll(additionalParams);
    }

    @Override
    public String getParameter(final String name)
    {
        String[] strings = getParameterMap().get(name);
        if (strings != null)
        {
            return strings[0];
        }
        return super.getParameter(name);
    }

    @Override
    public Map getParameterMap()
    {
        if (allParameters == null)
        {
            allParameters = new TreeMap();
            allParameters.putAll(super.getParameterMap());
            allParameters.putAll(modifiableParameters);
        }
        return Collections.unmodifiableMap(allParameters);
    }

    @Override
    public Enumeration getParameterNames()
    {
        return Collections.enumeration(getParameterMap().keySet());
    }

    @Override
    public String[] getParameterValues(final String name)
    {
        return getParameterMap().get(name);
    }
}

Last add a filter with appropriate web.xml config the doFilter() will look like this

public void doFilter(ServletRequest request, ServletResponse reponse, FilterChain chain)
            throws IOException, ServletException {
        Map params = request.getParameterMap();
        Map extraParams = new TreeMap();
        Iterator i = params.keySet().iterator();

        while ( i.hasNext() )
          {
            String key = (String) i.next();
            String value = ((String[]) params.get( key ))[ 0 ];
            extraParams.put(key.toLowerCase(), new String[] {value});

          }
        HttpServletRequest wrappedRequest = new CustomWrappedRequest((HttpServletRequest)request, extraParams);

        chain.doFilter(wrappedRequest, reponse);

    }

Here the filter will convet the params into lowercase and attach it to your custom made request. Then use can use @ModelAttribute in the controller code to get the desired object.

Hope it helps :)