import java.util.regex.Pattern;

public class UrlFormatException extends RuntimeException {
    private final String invalidUrl;

    public UrlFormatException(String message, String invalidUrl) {
        super(message);
        this.invalidUrl = invalidUrl;
    }

    public UrlFormatException(String message, String invalidUrl, Throwable cause) {
        super(message, cause);
        this.invalidUrl = invalidUrl;
    }

    public String getInvalidUrl() {
        return invalidUrl;
    }
}

class UrlValidator {
    private static final Pattern URL_PATTERN = Pattern.compile("^(https?|http)://[\\w-]+(\\.[\\w-]+)+([\\w.,@?^=%&:/~+#-]*[\\w@?^=%&/~+#-])?$");

    public static void validate(String url) {
        if (url == null || url.isBlank()) {
            throw new UrlFormatException("URL不能为空", url);
        }
        if (!URL_PATTERN.matcher(url).matches()) {
            throw new UrlFormatException("URL格式不合法，仅支持http/https协议", url);
        }
    }

    public static void main(String[] args) {
        System.out.println("=== 测试 URL 校验 ===");

        System.out.println("\n空URL校验：");
        try {
            UrlValidator.validate(null);
        } catch (UrlFormatException e) {
            System.out.println("  异常: " + e.getMessage());
            System.out.println("  无效URL: " + e.getInvalidUrl());
        }

        System.out.println("\n非法URL校验：");
        try {
            UrlValidator.validate("ftp://example.com");
        } catch (UrlFormatException e) {
            System.out.println("  异常: " + e.getMessage());
            System.out.println("  无效URL: " + e.getInvalidUrl());
        }

        System.out.println("\n正确URL校验：");
        try {
            UrlValidator.validate("https://www.example.com/page");
            System.out.println("  通过");
        } catch (UrlFormatException e) {
            System.out.println("  异常: " + e.getMessage());
        }
    }
}