import java.util.regex.Pattern;

/**
 * URL验证工具类（工具层）
 */
public class UrlValidator {
    // URL正则表达式（简化版，适配http/https/ftp）
    private static final String URL_REGEX = "^(https?|ftp)://[a-zA-Z0-9.-]+(:\\d+)?(/.*)?$";
    private static final Pattern URL_PATTERN = Pattern.compile(URL_REGEX);

    // 验证URL格式
    public static boolean isValidUrl(String url) {
        if (url == null || url.trim().isEmpty()) {
            return false;
        }
        return URL_PATTERN.matcher(url.trim()).matches();
    }
}