前言：
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EL如果没有获取到值会显示空字符串而不是显示null
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html><html><head><meta charset="UTF-8"><title>el的隐式对象</title></head><body>${pageContext.request}<br><h4>在jsp页面动态获取虚拟目录</h4>${pageContext.request.contextPath}<br></body></html>package cn.itcast.domain;import java.text.SimpleDateFormat;import java.util.Date;public class User { private String name; private int age; private Date birthday; /* * 逻辑视图 */ public String getBirStr() { if(birthday!=null) { //1.格式化日期对象 SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); //2.返回字符串即可 return sdf.format(birthday); }else { return ""; } } 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; } }<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html><html><head><meta charset="UTF-8"><title>el2获取域中的数据</title></head><body> <% //在域中存储数据 request.setAttribute("name", "张三"); session.setAttribute("age", "23"); %> <h3>el获取值</h3> ${requestScope.name}; ${sessionScope.age};</body></html><%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ page import="cn.itcast.domain.User" %><%@ page import="java.util.*" %><!DOCTYPE html><html><head><meta charset="UTF-8"><title>Insert title here</title></head><body> <% User user=new User(); user.setName("张三"); user.setAge(23); user.setBirthday(new Date()); request.setAttribute("u", user); List list=new ArrayList(); list.add("aaa"); list.add("bbb"); list.add(user); request.setAttribute("list", list); Map map=new HashMap(); map.put("sname","李四"); map.put("gender","男"); map.put("user",user); %><h3>el获取对象中的值</h3>${requestScope.u };<br><%-- 通过的是对象的属性来获取setter或getter方法，去掉set或get,再将剩余部分，首字母变为小写。setName-->Name-->name--%>${requestScope.u.name };<br>${requestScope.u.age};<br>${requestScope.u.birthday };<br>${requestScope.u.birthday.month };<br>${u.birStr}<br><h3>el获取List的值</h3>${list};<br>${list[0]};<br>${list[1]};<br>${list[2].name};<br><h3>el获取Map的值</h3>${map.gender};<br>${map["gender"]};<br><!-- 这里的user指的是键的名称 -->${map.user.name};<br> </body></html> 版权声明：
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