Javaweb的el操作

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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>
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