第一步：在web-inf下创建一个tld文件
<?xml version="1.0" encoding="UTF-8" ?> ?<taglib xmlns="http://java.sun.com/xml/ns/javaee" ?????xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ?????xsi:schemaLocation="http://java.sun.com/xml/ns/javaee ??????http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd" ?????version="2.1"> ?????<description> ?????<![CDATA[security Tags]]> ?????</description> ?????<tlib-version>1.0</tlib-version> ?????<short-name>security</short-name> ?????<uri>http://www.springsecurity.org/jsp</uri> ???<tag> ?????????<description> ?????????<![CDATA[authorize Tag]]> ?????????</description> ?????????<name>authorize</name> ?????????<tag-class> ????????????cn.tms.util.AuthorizeTag ???????</tag-class> ?????????<body-content>JSP</body-content> ?????????<attribute> ?????????????<name>URL</name> ?????????????<required>false</required> ?????????????<rtexprvalue>true</rtexprvalue> ?????????????<type>java.lang.String</type> ?????????</attribute> ?????</tag> ?</taglib> ?
第二步：创建一个类继承BodyTagSupport
package cn.tms.util;import java.util.List;import javax.servlet.http.HttpServletRequest;import javax.servlet.jsp.tagext.BodyTagSupport;import cn.tms.dao.IPrivilegeDAO;import cn.tms.dao.IRoleDAO;import cn.tms.entity.Privilege;import cn.tms.entity.UserInfo;import org.springframework.web.context.WebApplicationContext;import org.springframework.web.context.support.WebApplicationContextUtils;//标签public class AuthorizeTag ?extends BodyTagSupport { ???//你提供一个用户名字，我给一个用户拥有的权限集合，并且操作是在权限的DAO中 ???????private IPrivilegeDAO privilegeDAO; ???????private String URL; ???????public String getURL() { ?????????????return URL; ?????????} ?????????public void setURL(String uRL) { ???????????URL = uRL; ?????????} ?????????@Override ?????????public int doStartTag() { ???????????// 如果URL不空就显示URL，否则就不显 ?????????????if (null != URL) { ???????????????getUserDao(); ???????????????HttpServletRequest request = (HttpServletRequest)pageContext.getRequest(); ???????????????UserInfo info=(UserInfo)request.getSession().getAttribute("userinfo"); ???????????????List<Privilege> list = privilegeDAO.findAllPrivilegeByUserId(info.getUserid()); ???????????????System.out.println(list.size()); ???????????????????????????????for (Privilege item : list) { ???????????????????System.out.println(URL+"=========================="); ???????????????????if(item.getUrl().equals(URL)){ ?????????????????????????//正确渲染该标签 ?????????????????????????return EVAL_BODY_INCLUDE; ?????????????????????} ???????????????} ?????????????????????????} ?????????????return this.SKIP_BODY; ?????????} ???????public void getUserDao() { ?????????????WebApplicationContext applicationContext = WebApplicationContextUtils.getWebApplicationContext(pageContext.getServletContext()); ???????????privilegeDAO=(IPrivilegeDAO)applicationContext.getBean("IPrivilegeDAO"); ???????}}第三步: 在页面上使用之前在页面上添加
<%@taglib prefix="Authorize" uri="http://www.springsecurity.org/jsp" %>
*注意：这里的URi的地址和web-inf里面配的地址保持一致
最后使用：
这里Authorize是你自己定义的
URL是传入到Authorize里的，然后和后台取到的url进行对比，如果一致就在页面上渲染此标签，不一致就不渲染此标签
Jstl自定义标签
原文地址：https://www.cnblogs.com/with-lj/p/7898263.html