EL 中的运算符

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代码：

默认情况下（执行EL表达式的作用）

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>EL 表达式</title></head><body>     2+3=${2+3} <br/>     8%3=${8%3}       <hr>     3==4 = ${ 3==4 }<br/>     3>4=${3>4 }     <hr>          3>4 || 4==4 = ${3>4 || 4==4 }<br>          !true = ${!true }     <hr>     user = ${user }|     <hr>     empty user = ${empty user }<br/></body></html>

运行截图：

设置禁用EL表达式的情况下

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8" isELIgnored="true"%>    <%--添加isELIgnored="true"属性 --%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>EL 表达式</title></head><body>     2+3=${2+3} <br/>     8%3=${8%3}       <hr>     3==4 = ${ 3==4 }<br/>     3>4=${3>4 }     <hr>          3>4 || 4==4 = ${3>4 || 4==4 }<br>          !true = ${!true }     <hr>     user = ${user }|     <hr>     empty user = ${empty user }<br/></body></html>

运行效果：

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