礼悟：
好好学习合思考，尊师重道存感恩。叶见寻根三返一，江河湖海同一体。
虚怀若谷良心主，愿行无悔给最苦。读书锻炼强身心，诚劝且行且珍惜。
javaEE：7
javaSE：1.8
JSTL：1.2.2
server：tomcat 8.5
browser：Chrome/Firefox
os：windows7 x64
ide：MyEclipse 2017
项目结构
jizuiku-tags.tld
<?xml version="1.0" encoding="UTF-8"?><taglib xmlns="http://java.sun.com/xml/ns/j2ee" ?xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ?xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd" ?version="2.0"> ???<tlib-version>1.0</tlib-version> ?<short-name>jzk</short-name> ?<uri>http://www.jizuiku.com/tags/1.0</uri> ???????<!-- 配置标签 --> ?<tag> ?<name>MyDecorationTag</name><!-- 指定当前标签的名称 --> ?<tag-class>com.jizuiku.tag.MyDecorationSimpleTagSupport</tag-class><!-- 当前标签的处理类 --> ?<body-content>scriptless</body-content><!-- 指定标签体的类型 EL表达式 --> ?</tag> ?</taglib>
MyDecorationSimpleTagSupport.java
package com.jizuiku.tag;import java.io.IOException;import java.io.Writer;import javax.servlet.jsp.JspException;import javax.servlet.jsp.tagext.SimpleTagSupport;/** * 装饰一下标签中的内容，来个框框呀什么的 * ?* @author 博客园-给最苦 ?* @version V2017.12.04 */public class MyDecorationSimpleTagSupport extends SimpleTagSupport{@Overridepublic void doTag() throws JspException, IOException {// TODO Auto-generated method stubWriter out = this.getJspContext().getOut();// 这个从前是这样写的，输出的效果也对// out.write("<div class=‘commonDiv‘>");// 但是 给最苦 感觉 class的值还是用双引号包起来好// 所以，使用了 转义。。。还真成了// 这只是一个小插曲，嘿嘿。。。编程的乐趣out.write("<div class=\"commonDiv\">");// 将EL表达式的执行结果给out流this.getJspBody().invoke(out);out.write("</div>");}}MyJsp.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><%@ taglib prefix="j" uri="/WEB-INF/tlds/jizuiku-tags.tld"%><%String path = request.getContextPath();String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort()+ path + "/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>My JSP ‘MyJsp.jsp‘ starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><style type="text/css">.commonDiv {border: 3px dotted #ff006e; /*上下左右的边框线样式相同*/}</style></head><body><!-- 普通字符串 --><j:MyDecorationTag>hello world</j:MyDecorationTag><br><!-- EL表达式 --><c:set var="pageContext_name" value="pageContext_给最苦" scope="page"></c:set><j:MyDecorationTag>${pageScope.pageContext_name }</j:MyDecorationTag></body></html>浏览器查看
该页面的源代码
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="http://localhost:8081/Day13/"><title>My JSP ‘MyJsp.jsp‘ starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><style type="text/css">.commonDiv {border: 3px dotted #ff006e; /*上下左右的边框线样式相同*/}</style><script>"undefined"==typeof CODE_LIVE&&(!function(e){var t={nonSecure:"56731",secure:"56736"},c={nonSecure:"http://",secure:"https://"},r={nonSecure:"127.0.0.1",secure:"gapdebug.local.genuitec.com"},n="https:"===window.location.protocol?"secure":"nonSecure";script=e.createElement("script"),script.type="text/javascript",script.async=!0,script.src=c[n]+r[n]+":"+t[n]+"/codelive-assets/bundle.js",e.getElementsByTagName("head")[0].appendChild(script)}(document),CODE_LIVE=!0);</script></head><body data-genuitec-lp-enabled="false" data-genuitec-file-id="wc1-0" data-genuitec-path="/Day13/WebRoot/MyJsp.jsp"><!-- 普通字符串 --><div class="commonDiv">hello world</div><br data-genuitec-lp-enabled="false" data-genuitec-file-id="wc1-0" data-genuitec-path="/Day13/WebRoot/MyJsp.jsp"><!-- EL表达式 --><div class="commonDiv">pageContext_给最苦</div></body></html>学习资源：itcast和itheima视频库。如果您有公开的资源，可以分享给我的话，用您的资源学习也可以。
博文是观看视频后，融入思考写成的。博文好，是老师讲得好。博文坏，是 给最苦 没认真。
JSTL基础 SimpleTagSupport 自定义标签 标签体scriptless
原文地址：http://www.cnblogs.com/jizuiku/p/7994002.html