How to get parameter map from http request in java.

How to get parameter map from httpServlet request in java.

public static Map<String, String> getRequestMap(HttpServlet request){

         Map<String, String> r = new HashMap<String, String>();

         for (Map.Entry<String, String[]> entry: request.getParameterMap().entrySet()){

           String[] value = entry.getValue();

           if (value !=null && value .length>0) r.put(entry.getKey(), value[0]);

         }

         return r;

       }