获取域中存储的值
1.el表达式只能从域对象中获取值
2.语法：
1.${域名称.键名}:从指定域中获取指定键的值
域名称：
1.pageScope --> pageContext
2.requestScope --> request
3.sessionScope --> session
4.applicationScope --> application（ServletContext）
举例：在request域中存储了name = 张三
获取：${requestScope.name}
2.${键名}:表示依次从最小的域中查找是否有该键对应的值，直到找到为止。
${name}
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>el获取域中的数据</title>
</head>
<body>
<%
//在域中存储数据
session.setAttribute("name","李四");
request.setAttribute("name","张三");
session.setAttribute("age","23");
%>
<h3>获取值</h3>
${requestScope.name}
${sessionScope.age}
${sessionScope.haha}
${name}
</body>
</html>
获取域中存储的值对象值
获取对象、List集合、Map集合的值
1.对象：${域名称.键名.属性名}
本质上会去调用对象的getter方法
User对象
package com.peng.request.demo.domain;
import java.text.SimpleDateFormat;
import java.util.Date;
public class User {
private String name;
private int age;
private Date birthday;
public String getBirStr(){
if (birthday!=null){
//格式化日期对象
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
//返回字符串
return sdf.format(birthday);
}else {
return "";
}
}
public User() {
}
public User(String name, int age, Date birthday) {
this.name = name;
this.age = age;
this.birthday = birthday;
}
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;
}
}
js页面：
<%@ page import="com.peng.request.demo.domain.User" %>
<%@ page import="java.util.Date" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>el获取对象数据</title>
</head>
<body>
<%
User user = new User();
user.setName("张三");
user.setAge(23);
user.setBirthday(new Date());
request.setAttribute("u",user);
%>
<h3>el获取对象中的值</h3>
${requestScope.u}<br>
<%--
通过对象的属性来获取
setter或getter，去掉set或get，在将剩余部分，首字母变为小写。
setName --> Name --> name
--%>
${requestScope.u.name}<br>
${u.age}<br>
${u.birthday}<br>
${u.birthday.month}<br>
${u.birStr}
</body>
</html>
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标签：存储,name,对象,age,获取,birthday,public From： https://www.cnblogs.com/pengtianyang/p/16588456.html