<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" import="java.util.*"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>EL表达式语言运算</title>
</head>
<body>
<h2 align="center">EL表达式语言运算</h2><hr/>
<table border="1" align="center">
<tr>
<th><b>说明</b></th>
<th><b>EL表达式</b></th>
<th><b>运算结果</b></th>
</tr>
<tr>
<td>加</td>
<td>\${1+2}</td>
<td>${1+2}</td>
</tr>
<tr>
<td>减</td>
<td>\${-4-2}</td>
<td>${-4-2}</td>
</tr>
<tr>
<td>除</td>
<td>\${3 div 4}</td>
<td>${3 div 4}</td>
</tr>
<tr>
<td>取余</td>
<td>\${10%4}</td>
<td>${10%4}</td>
</tr>
<tr>
<td>条件求值</td>
<td>\${(1==2) ? 3:4}</td>
<td>${(1==2) ? 3:4}</td>
</tr>
<tr>
<td>数字-大于</td>
<td>${'${'}1 gt 2}</td>
<td>${1 gt 2}</td>
</tr>
<tr>
<td>字符-不等于</td>
<td>${'${'}'abe'ne'ade'}</td>
<td>${'abe'ne'ade'}</td>
</tr>
<tr>
<td>与</td>
<td>${'${'}true and true}</td>
<td>${true and true}</td>
</tr>
<tr>
<td>或</td>
<td>${'${'}true || false}</td>
<td>${true || false}</td>
</tr>
<tr>
<td>空判断</td>
<td>${'${'}not true}</td>
<td>${not true}</td>
</tr>
<tr>
<td>空判断</td>
<td>\${empty "2008"}</td>
<td>${empty "2008"}</td>
</tr>
<tr>
<td>空判断</td>
<td>\${empty null}</td>
<td>${empty null}</td>
</tr>
</table>
</body>
</html>
