EL表达式

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1.使用EL表达式改写乘法口诀实例。

<%@ page Xlanguage="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>My JSP 'a9.jsp' starting page</title>

</head>

<%@ page contentType="text/html; charset=GBK" %>

2.写一个实例，使用EL表达式分别获取某个 web 域中的对象，访问 javabean 的属性、访问 list 集合、访问 map 集合、访问数组

<%@ page Xlanguage="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="com.hbsi.el.*" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>

</head>

<body>
<%
String data ="abcd";
request.setAttribute("data1",data);
%>
${data1 }
<br/>
<%
UserBean user = new UserBean();
user.setName("zhangsan");
request.setAttribute("user1",user);
%>
${user1.name }
<br/>
<%
UserBean user2 = new UserBean();
Address add = new Address();
add.setCity("北京");
user2.setAddress(add);
request.setAttribute("user2",user2);
%>
${user2.address.city }
<br/>
<%
List list = new ArrayList();
list.add(new UserBean("aaaa"));
list.add(new UserBean("bbbb"));
list.add(new UserBean("cccc"));
request.setAttribute("list",list);
%>
${list[1].name }
<br/>
<%
Map map = new HashMap();
map.put("a",new UserBean("aaaa"));
map.put("b",new UserBean("bbbb"));
map.put("c",new UserBean("cccc"));
map.put("d",new UserBean("dddd"));
request.setAttribute("map1",map);
%>
${map1["d"].name }
</body>
</html>