jsp文件报错，Unknown tag (html:form)

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="html" uri="http://struts.apache.org/tags-html" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">



用户id/html:text

用户名/html:text

电子邮件/html:text

/html:submit
/html:cancel
/html:form

structs1的，看看本地的包是不是都有，是不是配置对了。