一、 ${ }直接取值
<%@ page language ="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" >
<html>
<head>
<meta http-equiv= "Content-Type" content ="text/html; charset=UTF-8">
<title> Insert title here</ title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
%>
<h1> 姓名：${param.name }</h1 >
</body>
</html>
二、一组数据paramValues
<%
request.setCharacterEncoding("utf-8");
%>
<h1> 姓名：${param.name }</h1 >
<h1> 年龄：${param.age }</h1 >
<h1> 爱好一：${paramValues.hobby[0] }</h1 >
<h1> 爱好二：${paramValues.hobby[1] }</h1 >
<h1> 爱好三：${paramValues.hobby[2] }</h1 >
三、对象的操作
<%
People p1=new People();
p1.setId(1);
p1.setName("zhangsan");
p1.setAge(20);
request.setAttribute("zhangsan",p1 );
%>
<h1 >Id: ${zhangsan.id } </h1 >
<h1 >Name: ${zhangsan.name } </h1 >
<h1 >Age: ${zhangsan.age } </h1 >
四、对集合的操作
<%
List all= new LinkedList();
all.add(0,"元素一");
all.add(1,"元素二");
all.add(2,"元素三");
all.add(3,"元素四");
request.setAttribute("all", all);
%>
<h1> 第一个是：${ all[0]}</h1 >
<h1> 第二个是：${ all[1]}</h1 >
<h1> 第三个是：${ all[2]}</h1 >
<h1> 第四个是：${ all[3]}</h1 >
五、对操作符的操作
<%
request.setAttribute("num1", 12);
request.setAttribute("num2", 13);
request.setAttribute("num3", 13);
request.setAttribute("num4", 23);
%>
<h1> num1+num2=${num1+num2 }</ h1>
<h1> num1-num2=${num1-num2 }</ h1>
<h1> num1*num2=${num1*num2 }</ h1>
<h1> num1/num2=${num1/num2 }</ h1>
El表达式
原文：http://www.cnblogs.com/phantomfjh/p/4959500.html
