Question

Does URLEncodedUtils.parse(uri, encoding) return the parameters in the same order mentioned in the URL?
And does it return all the values for parameters with duplicate names?

Answer 1

public static void parse (
       final List <NameValuePair> parameters, 
       final Scanner scanner, 
       final String encoding) {
   scanner.useDelimiter(PARAMETER_SEPARATOR);
   while (scanner.hasNext()) {
       final String[] nameValue = scanner.next().split(NAME_VALUE_SEPARATOR);
       if (nameValue.length == 0 || nameValue.length > 2)
           throw new IllegalArgumentException("bad parameter");

        final String name = decode(nameValue[0], encoding);
        String value = null;
       if (nameValue.length == 2)
           value = decode(nameValue[1], encoding);
       parameters.add(new BasicNameValuePair(name, value));
   }
}

As you can see in the parse-function, it preserves the order of the parameters in the URL. But this is an implementation detail and not documented, so it can change without warning. You really should not rely on that behavior in your code.