jstl c标签库的使用

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<%
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 'tag.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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

  </head>
 
  <body>
    <%
      List list=new ArrayList<String>();
      list.add("abc");
      list.add("sssss");
      list.add("bbbbvvv");
      request.setAttribute("list",list);
     %>
  <c:forEach items="${list}" var="li">
      ${li} <br>
   </c:forEach>
  </body>
</html>




运行原理 tomcat 读取jsp  生成servlet  请求时---->解析标签文件--->遇到前缀--->
        ----->找地址----->在web-inf下找tld文件----jstl.ja----->找到c.tld文件,里面定义了一些xml标签---->找到forEach名为-----》钟祥一个Foreach的类


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