MyEclipse中的struts标签老是提示unknow tag

代码如下<%@ page contentType="text/html;charset=gb2312" %>
<%@ taglib uri="/tags/struts-bean" prefix="bean"%>
<%@ taglib uri="/tags/struts-html" prefix="html"%>
<%@ taglib uri="/tags/struts-logic" prefix="logic"%>
<html>
<head>
<title><bean:message key="title.regist"/></title>
</head>
<body>
<a href="welcome.do">转入</a>
</body>
</html>