GWT java URL Validator

Question

Does someone knows a function that validate if a url is valid or not purely in GWT java without using any JSNI

Answer 1

I am using this one (making use of regular expressions):

private RegExp urlValidator;
private RegExp urlPlusTldValidator;
public boolean isValidUrl(String url, boolean topLevelDomainRequired) {
    if (urlValidator == null || urlPlusTldValidator == null) {
        urlValidator = RegExp.compile("^((ftp|http|https)://[\\w@.\\-\\_]+(:\\d{1,5})?(/[\\w#!:.?+=&%@!\\_\\-/]+)*){1}$");
        urlPlusTldValidator = RegExp.compile("^((ftp|http|https)://[\\w@.\\-\\_]+\\.[a-zA-Z]{2,}(:\\d{1,5})?(/[\\w#!:.?+=&%@!\\_\\-/]+)*){1}$");
    }
    return (topLevelDomainRequired ? urlPlusTldValidator : urlValidator).exec(url) != null;
}