JSP EL表达式

<%@ 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>EL表达式的介绍</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">

  </head>
  
  <body>
    <% 
    	session.setAttribute("username" , "libinxuan"); 
    	String[] week = {"星期一","星期二","星期三","星期四","星期五","星期六","星期天"};
    	session.setAttribute("week", week);
    %>
    <table border="1">
    	<tr>
    		<td><b>运算符</b></td>
    		<td><b>EL 表达式</b></td>
    		<td><b>运算结果</b></td>
    	</tr>
    	<tr>
    		<td>加法</td>
    		<td>\${10+10}</td>
    		<td>${10+10}</td>
    	</tr>
    	<tr>
    		<td>比较</td>
    		<td>\${101 gt 10}</td>
    		<td>${101 > 10}</td>
    	</tr>
    	<tr>
    		<td>比较</td>
    		<td>\${10 == 10}</td>
    		<td>${10 == 10}</td>
    	</tr>
    	<tr>
    		<td>读取数组</td>
    		<td>\${sessionScope.username}</td>
    		<td>${sessionScope.username}</td>
    	</tr>
    	<tr>
    		<td>读取变量</td>
    		<td>\${sessionScope.week['1']}</td>
    		<td>${sessionScope.week['1']}</td>
    	</tr>
    </table>
  </body>
</html>

 

 

 

 

 

 设置不使用EL表达式有两种方法:

  1. jsp中修改%@page isELIgnored="true" %
  2. web.xml修改
    <?xml version="1.0" encoding="UTF-8"?>
    <web-app version="2.5" 
    	xmlns="http://java.sun.com/xml/ns/javaee" 
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
      
      <jsp-config>
      	<jsp-property-group>
      		<url-pattern>*.jsp</url-pattern>
      		<el-ignored>true</el-ignored>
      	</jsp-property-group>
      </jsp-config>
      
      <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
      </welcome-file-list>
    </web-app>
    
     

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