从Request中获得当前请求的全路径

传入HttpServletRequest 返回当前路径

public String getFromUrl(HttpServletRequest request) {
		StringBuffer sbf = request.getRequestURL();

		String queryInfo = request.getQueryString();
		if (queryInfo != null && (!queryInfo.equals(""))) {
			sbf.append("?");
			sbf.append(queryInfo);
		}
		return sbf.toString();
	}