标签：serve 项目结构 sim title star xmlns j2ee public extends
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{
@Override
public void doTag() throws JspException, IOException {
// TODO Auto-generated method stub
Writer 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
标签：serve 项目结构 sim title star xmlns j2ee public extends
原文地址：http://www.cnblogs.com/jizuiku/p/7994002.html
