java后台request获取项目名，端口号等

	HttpServletRequest request = getRequest();
	String scheme = request.getScheme();//http
	String serverName = request.getServerName();//localhost
	int serverPort = request.getServerPort();//8080
	String contextPath = request.getContextPath();//项目名
	String url = scheme+"://"+serverName+":"+serverPort+contextPath;//http://127.0.0.1:8080/test