JavaEE - Iterate through request parameters

iterateEnumeration.java

        PrintWriter writer = resp.getWriter();
        Enumeration<String> paramNames = req.getParameterNames();
        writer.append("<h2>Parameters</h2>");
        writer.append("<h3>URL Parameters</h3>");
        writer.append("<ul>");
        while(paramNames.hasMoreElements()){
            String param = paramNames.nextElement(); //do not use req.getParameterNames() here or it goes in an infinite loop
            writer.append("<li>" + param + "</li>");
            String values[] = req.getParameterValues(param);
            writer.append("<ul>");
            for(int i = 0; i < values.length; i++){
                writer.append("<li>" + values[i] + "</li>");
            }
            writer.append("</ul>");
        }
        writer.append("</ul>");