1、service层--标签处理类：
1 import javax.servlet.jsp.JspException; 2 import javax.servlet.jsp.tagext.BodyTagSupport; 3 ?4 /** 5 ?* Created by Administrator on 2018-4-28. 6 ?*/ 7 public class PrivilegeService extends BodyTagSupport { 8 ?9 ????//页面编码10 ????private String menu;11 ????//页面操作12 ????private String sn;13 14 ????public PrivilegeService() {15 ????}16 17 ????public int doStartTag() throws JspException {18 ????????try {19 ????????????if("check".equals(this.menu)&& "admin".equals(this.sn)) {20 ????????????????return 1;21 ????????????}22 ????????} catch (Exception var3) {23 ????????}24 ????????return 0;25 ????}26 27 ????public int doEndTag() throws JspException {28 ????????return 6;29 ????}30 31 ????public String getMenu() {32 ????????return menu;33 ????}34 35 ????public void setMenu(String menu) {36 ????????this.menu = menu;37 ????}38 39 ????public String getSn() {40 ????????return sn;41 ????}42 43 ????public void setSn(String sn) {44 ????????this.sn = sn;45 ????}46 }2、标签描述文件： 将下面的内容加入tld文件中。以增加web应用对上面的标签类的支持 ?privilege.tld --书写格式
1 <?xml version="1.0" encoding="UTF-8"?> 2 ?3 <!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN" "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd"> 4 ?5 <taglib> 6 ???<tlibversion>1.0</tlibversion> 7 ???<jspversion>2.0</jspversion> 8 ???<shortname>通用标签库</shortname> 9 ???<info>提供通用组件的标签库</info>10 11 ???<!-- 细粒度权限检查标签 -->12 ???<tag>13 ??????<name>privilege</name>14 ??????<tagclass>test.service.PrivilegeService</tagclass>15 ??????<bodycontent>JSP</bodycontent>16 17 ??????<attribute>18 ?????????<name>menu</name>19 ?????????<required>true</required>20 ?????????<rtexprvalue>true</rtexprvalue>21 ??????</attribute>22 23 ??????<attribute>24 ?????????<name>sn</name>25 ?????????<required>true</required>26 ?????????<rtexprvalue>true</rtexprvalue>27 ??????</attribute>28 ???</tag>29 </taglib>
3、jsp层
3.1、jsp层格--引入
<%@ taglib prefix=‘demo‘ uri=‘/WEB-INF/tld/privilege.tld‘ %>
3.2、jsp层格--标签书写
<demo:privilege menu="check" sn="admin"> ?? <button type="button">删除</button></demo:privilege>
完成以前文件的书写，在访问对应的JSP时，自定义标签就会起作用。
jsp自定义标签
原文地址：https://www.cnblogs.com/willboke/p/8966678.html