jstl 与 el表达式

时间：2023-03-08 19:23:52
jstl 与 el表达式

jar下载地址参考：https://blog.csdn.net/qq_30062589/article/details/80224080

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

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

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>Insert title here</title>

</head>

<body>

    <c:if test="${empty users }">

        aaa

    </c:if>

    <c:if test="${!empty users}">

        bbb

    </c:if>

    <br>

    <c:forEach begin="0" end="5" var="i">

        ${i }<br/>

    </c:forEach>

    <c:forEach items="${applicationScope.users }" var="user">

        ${user.name }<br/>

    </c:forEach>

</body>

</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

    <%@ page import="cn.sasa.domain.*" %>

    <%@ page import="java.util.*" %>

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>Insert title here</title>

</head>

<body>

    <%

        request.setAttribute("name", "hi");

        MyUser user1 = new MyUser();

        user1.setName("aaa");

        session.setAttribute("user", user1);

        MyUser user2 = new MyUser();

        user2.setName("bbb");

        List<MyUser> userList = new ArrayList<MyUser>();

        userList.add(user1);

        userList.add(user2);

        application.setAttribute("users", userList);

        out.write("web----"+this.getServletContext().getContextPath());

    %>

    <!-- el表达式从域中取值取值 -->

    <br/>

    ${ requestScope.name }

    <br/>

    ${sessionScope.user.name }

    <br/>

    ${applicationScope.users[0].name }

    ${applicationScope.users[1].name }

    <hr/>

    <!-- *全域查找 -->

    <br/>

    ${ name }

    <br/>

    ${user.name }

    <br/>

    ${users[0].name }

    ${users[1].name }

    <br/>

    el_web_-----${pageContext.request.contextPath }

</body>

</html>

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