Javaweb的el操作
<span style="font-size:18px;"><%@ 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 'eloperate.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">
-->
<title>el运算</title>
</head>
<body>
<table>
<tr >
<td>
<table border="1">
<tr>
<th colspan="2">四则运算：</th>
</tr>
<tr>
<th>操作符</th>
<th>操作结果</th>
</tr>
<tr>
<td>\${1+2}</td>
<td>${1+2}</td>
</tr>
<tr>
<td>\${1-2}</td>
<td>${1-2}</td>
</tr>
<tr>
<td>\${1*2}</td>
<td>${1*2}</td>
</tr>
<tr>
<td>\${6/3}<br/>\${6 div 3}</td>
<td>${6/3}<br/>${6 div 3}</td>
</tr>
<tr>
<td>\${9%4}<br/>\${9 mod 4}</td>
<td>${9%4}<br/>${9 mod 4}</td>
</tr>
</table>
</td>
<td>
<table border="1">
<tr>
<th colspan="2">比较运算：</th>
</tr>
<tr>
<th>操作符</th>
<th>操作结果</th>
</tr>
<tr>
<td>\${2==1}<br/>\${2 eq 1}</td>
<td>${2==1}<br/>${2 eq 1}</td>
</tr>
<tr>
<td>\${2!=1}<br/>\${2 ne 1}</td>
<td>${2!=1}<br/>${2 ne 1}</td>
</tr>
<tr>
<td>\${2<1}<br/>\${2 lt 1}</td>
<td>${2<1}<br/>${2 lt 1}</td>
</tr>
<tr>
<td>\${2>1}<br/>\${2 gt 1}</td>
<td>${2>1}<br/>${2 gt 1}</td>
</tr>
<tr>
<td>\${2<=1}<br/>\${2 le 1}</td>
<td>${2<=1}<br/>${2 le 1}</td>
</tr>
<tr>
<td>\${2>=1}<br/>\${2 ge 1}</td>
<td>${2>=1}<br/>${2 ge 1}</td>
</tr>
</table>
</td>
<td>
<table border="1">
<tr>
<th colspan="2">逻辑运算：</th>
</tr>
<tr>
<th>操作符</th>
<th>操作结果</th>
</tr>
<tr>
<td>\${true&&false}<br/>\${true and false}</td>
<td>${true&&false}<br/>${true and false}</td>
</tr>
<tr>
<td>\${true||false}<br/>\${true or false}</td>
<td>${true||false}<br/>${true or false}</td>
</tr>
<tr>
<td>\${2<1}<br/>\${2 lt 1}</td>
<td>${2<1}<br/>${2 lt 1}</td>
</tr>
<tr>
<td>\${!false}<br/>\${not false}</td>
<td>${!false}<br/>${not false}</td>
</tr>
<tr>
<td>\${2<=1}<br/>\${2 le 1}</td>
<td>${2<=1}<br/>${2 le 1}</td>
</tr>
<tr>
<td>\${2>=1}<br/>\${2 ge 1}</td>
<td>${2>=1}<br/>${2 ge 1}</td>
</tr>
</table>
</td>
<td>
<table border="1">
<tr>
<th colspan="2">特殊运算：</th>
</tr>
<tr>
<th>操作符</th>
<th>操作结果</th>
</tr>
<tr>
<td>\${empty null }<br/>\${empty ""}<br/>\${empty 0}<br/>\${empty " "}</nr></td>
<td>${empty null }<br/>${empty ""}<br/>${empty 0}<br/>${empty " "}</nr></td>
</tr>
<tr>
<td>\${2>1?'two':'one'}</td>
<td>${2>1?'two':'one'}</td>
</tr>
</table>
</td>
</tr>
</table>
</body>
</html></span>
时间： 2024-08-11 09:56:21