如何获取web项目的绝对路径

仅供参考！

public class UrlConstant{private static String linkPrefix = null;private UrlConstant(){}//用来获取Url域名public static String getUrlPrfix(HttpServletRequest request){if (linkPrefix == null){String urlPrefix =request.getScheme() + "://" + request.getServerName() + ":"+ request.getServerPort() + request.getContextPath()+ "/";linkPrefix = urlPrefix;return linkPrefix;}return linkPrefix;}}