1）helloWorld：
注 意当做下面的项目时，需要导入两个包：jstl.jar和standard.jar。其它的就是单个单个的jsp了，比较简单。
例 2.2.1
hello.jsp：
<%@ page contentType="text/html; charset=GBK" %>
<!--why here is http://java.sun.com/jsp/jstl/core,because lib/standard.jar/c.tld has a statement,
<uri>http://java.sun.com/jsp/jstl/core</uri>, you change there, then here you can also change.
I tried before. in internal tomcat you can not cahnge, but in the external tomcat,
you can change the content of c.tld.
-->
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page import="java.util.*"%>
<html>
<body>
<c:out value="你好，马克-to-win！"/><br>
</body>
</html>
更多请看：https://blog.csdn.net/qq_44594371/article/details/103183681
