protected Iterator<String> keysImpl() {
//noinspection unchecked
Enumeration<String> names = request.getParameterNames();
return names == null ? null : CollectionUtil.iterator(names);
}
protected Iterator<String> valuesImpl(String pName) {
String[] values = request.getParameterValues(pName);
return values == null ? null : CollectionUtil.iterator(values);
}