例1： 

java">import java.util.regex.Pattern;public class UrlValidator {private static final Pattern SAFE_URL_PATTERN = Pattern.compile("^(http|https)://[^/]+/.*$");public static boolean isSafeUrl(String url) {if (url == null || url.isEmpty()) {return false;}// 验证 URL 是否符合安全模式Matcher matcher = SAFE_URL_PATTERN.matcher(url);if (!matcher.matches()) {return false;}// 验证是否为本地地址或内部地址try {URL u = new java.net.URL(url);String host = u.getHost();if (isLocalAddress(host) || isInternalAddress(host)) {return false;}} catch (Exception e) {