1.获取请求的URL
StringBuffer requestURL = request.getRequestURL();2.获取请求的URI
URI：URL去掉http协议和本机后剩余的部分
String requestURI = request.getRequestURI();3.获取根路径
String contextPath = request.getContextPath();4.获取服务端IP
String remoteAddr = request.getRemoteAddr();5.获取<url-pattern>中的精确路径部分
String servletPath = request.getServletPath();6.获取<url-pattern>中的匹配路径部分
String pathInfo = request.getPathInfo();