<%@page import="java.util.HashMap"%>
<%@page import="java.util.List"%>
<%@page import="java.util.ArrayList"%>
<%@ 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>
<title>EL表达式</title>
</head>
<body>
<jsp:useBean id="person" class="com.itheima.domain.Person"></jsp:useBean>
<jsp:setProperty property="name" name="person" value="李四"/>
<jsp:setProperty property="age" name="person" value="18"/>
<jsp:setProperty property="sex" name="person" value="男"/>
<br/>--------------------jsp输出---------------------<br/>
<%=person.getName()+person.getAge()+person.getSex() %>
<br/>--------------------EL获取对象的属性---------------------<br/>
${person.name }${person.age }${person.sex }
<br/>--------------------EL获取有序集合的元素---------------------<br/>
<%
List list=new ArrayList();
list.add("早上好");
list.add("中午好");
list.add("晚上好");
request.setAttribute("list", list);
%>
${list[0] }${list[1] }
<br/>--------------------EL获取map集合中的元素---------------------<br/>
<%
HashMap map=new HashMap();
map.put("name", "张三");
map.put("age","20");
request.setAttribute("map", map);
%>
姓名：${map.name }年龄：${map.age }
<br/>------EL小应用----<br/>
<%request.setAttribute("sex", "0"); %>
<form action="" method="get">
<input type="radio" name="sex" value="1" ${ sex=="1"?"checked=‘checked‘":""}/>男
<input type="radio" name="sex" value="0" ${ sex=="0"?"checked=‘checked‘":""}/>女
用到了二元表达式
</form>
</body>
</html>
时间： 2024-08-24 03:06:18