EL的内置对象和执行表达式 · JavaWeb学习

![](https://box.kancloud.cn/581bd7347b9497eefb6d8922209c209a_622x367.png) el1.jsp ~~~ <%-- Created by IntelliJ IDEA. User: Administrator Date: 2018/7/14 Time: 15:33 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <%-- 获取参数 --%> ${param.userName} <%-- 主机信息？ --%> ${header.host} </body> </html> ~~~ 执行表达式 ~~~ ${1+1} ${2>1} ${2 eq 2} ${2>1 || 3>2} ${2>1 ? ture:false} ${empty user} ~~~ ![](https://box.kancloud.cn/1e7c5f07118273d0123c2404bd405015_184x21.png)