Jstl自定義標簽
阿新 • • 發佈:2018-02-28
用戶 err span textutils 進行 自己 bsp frame art
authorize.tld
第一步:在web-inf下創建一個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:創建一個類繼承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; //標簽 public class AuthorizeTag extends BodyTagSupport { //你提供一個用戶名字,我給一個用戶擁有的權限集合,並且操作是在權限的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不空就顯示URL,否則就不顯 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)){ //正確渲染該標簽 return EVAL_BODY_INCLUDE; } } } return this.SKIP_BODY; } public void getUserDao() { WebApplicationContext applicationContext = WebApplicationContextUtils.getWebApplicationContext(pageContext.getServletContext()); privilegeDAO=(IPrivilegeDAO)applicationContext.getBean("IPrivilegeDAO"); } }AuthorizeTag
第三步: 在頁面上使用之前在頁面上添加
<%@taglib prefix="Authorize" uri="http://www.springsecurity.org/jsp" %>
*註意:這裏的URi的地址和web-inf裏面配的地址保持一致
最後使用:
這裏Authorize是你自己定義的
URL是傳入到Authorize裏的,然後和後臺取到的url進行對比,如果一致就在頁面上渲染此標簽,不一致就不渲染此標簽
Jstl自定義標簽