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;
	}
}