EL算术表达式

时间：2023-12-20 23:27:38
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%

    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 'demo2.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>

    <h1>EL执行运算</h1>

    <h3>算术运算</h3>

    <%

        pageContext.setAttribute("n1", 10);

        pageContext.setAttribute("n2", 20);

    %>

    ${n1+n2 }

    <h3>关系运算</h3>

    ${n1<n2 } ${n1 lt n2 } "lessthan"

    <br> ${n1>n2 } ${n1 gt n2 }

    <br> ${n1==n2 } ${n1 eq n2 }

    <br> ${n1!=n2 } ${n1 ne n2 }

    <br> ${n1>=n2 } ${n1 ge n2 }

    <br> ${n1<=n2 } ${n1 le n2 }

    <br>

    <h3>关系运算</h3>

    ${(n1<n2)&&(n3>n4) } ${(n1<n2) and (n3>n4) }

    <br> ${(n1<n2)||(n3>n4) } ${(n1<n2) or (n3>n4) }

    <br> ${!(n1<n2)} ${not (n1<n2)}

    <br>

    <h3>三元运算符</h3>

    ${n1==n2 ?"n1==n2":"n1!=n2"}

    <br> ${user==null ?"user 为空":"U"}

    <br>${empty user ?"yes emptys":"no emptys"}

    <br>${not empty user ?"yes no emptsy":"no emptys"}

</body>

</html>

EL算术表达式

相关文章