JSP Standard Tag Library JSP标准标签库

时间：2023-03-10 04:57:07
JSP Standard Tag Library JSP标准标签库

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>

　　

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