<%@page import="cn.itcast.domain.Address"%>
<%@page import="cn.itcast.domain.Person"%>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML>
<html>
<head>
<title>el表达式和 jstl 快速入门</title>
</head>
<body>
<%
String data = "abcxx";
request.setAttribute("data", data);
%>
${ data }<br />
<%--与下面的方法是一样的结果 --%>
<%=pageContext.findAttribute("data")%><br />
<%-- 在 Person 输入后按下 Alt + / 自动添加引用 --%>
<%
Person p = new Person();
p.setName("aabxx");
request.setAttribute("person", p);
%>
${ person.name }<br />
<%-- 在 Person 输入后按下 Alt + / 自动添加引用 --%>
<%
Person p2 = new Person();
Address a = new Address();
a.setCity("上海");
p2.setAddress(a);
request.setAttribute("person2", p2);
%>
${ person2.address.city }<br />
<%
List list = new ArrayList();
list.add(new Person("abc"));
list.add(new Person("abcd"));
list.add(new Person("abcde"));
request.setAttribute("list", list);
%>
${ list[1].name }<br />
${ list[2].name }<br />
<%
Map map = new HashMap();
map.put("aa", new Person("abc"));
map.put("bb", new Person("abcd"));
map.put("cc", new Person("abcde"));
map.put("dd", new Person("abcdef"));
map.put("111", new Person("abcdefg"));
request.setAttribute("map", map);
%>
${ map.bb.name }<br />
<%-- 遇到关键字是 数字 时，用 map[‘关键字‘] 来取值 --%>
${ map[‘111‘].name }<br />
<%-- 取web应用名称 --%>
${ pageContext.request.contextPath }<br />
<%-- 用它时不用以 / 为前缀 --%>
<a href="${ pageContext.request.contextPath }">主页</a>
</body>
</html>
其中 Person 类是：
package cn.itcast.domain;
import java.util.Date;
public class Person {
// Source -> Generate Constructors from Superclass 生成无参构造方法
public Person() {
super();
// TODO Auto-generated constructor stub
}
// Source -> Generate Constructors using Fields 生成有参的构造方法
public Person(String name) {
super();
this.name = name;
}
private String name = "初始化值";
private int age;
private Date birthday;
private Address address;
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
}
时间： 2024-08-08 01:47:02