了解了基本的标签的底层实现，可以看系统定义的强大的标准标签
1、首先引入两个jar包
2、基本语法
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:out value="你好" ></c:out>
核心标签库
c:out
c:set
c:remove
c:catch
c:if
c:choose c:when c:otherwise
c:forEach
c:fortokens
c:import
c:url
c:redirect
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>c_out</title>
</head>
<body>
<%-- c:out --%>
<%
pageContext.setAttribute("userName","lisaRong");
%>
<c:out value="${userName }" ></c:out><br>
<c:out value="${userName2 }" default="某人" ></c:out><br> <%-- c:set --%>
<c:set var="people" value="james" scope="request"></c:set>
<c:out value="${people }" ></c:out><br> <jsp:useBean id="per" class="com.zhiqi.model.Person" scope="page"></jsp:useBean>
<c:set property="id" target="${per }" value="10010"></c:set>
<c:set property="name" target="${per }" value="丽丽"></c:set>
<c:set property="age" target="${per }" value="24"></c:set>
<p>${per.id }</p>
<p>${per.name }</p>
<p>${per.age }</p> <c:remove var="people" scope="request"></c:remove>
<c:out value="${people }" default="没人么？"></c:out><br> <%--异常捕获 --%>
<c:catch var="errorMsg">
<%
int a=1/0;
%>
</c:catch>
<p>${errorMsg }</p> <c:if test="${per.age>18 }" var="r" scope="page">
<p>年龄：${per.age }</p>
</c:if> <c:set property="age" target="${per }" value="16"></c:set>
<c:if test="${per.age<18 }" var="result" scope="page">
<p>未成年</p>
</c:if>
</body>
</html>