1.九大内置对象
2.四大作用域
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<%--内置对象--%>
<%
pageContext.setAttribute("name1","name1");
pageContext.setAttribute("name","name",pageContext.SESSION_SCOPE);
request.setAttribute("name2","name2");
session.setAttribute("name3","name3");
application.setAttribute("name4","name4");
%>
<%
String name1 = (String) pageContext.findAttribute("name1");
String name2 = (String) pageContext.findAttribute("name2");
String name3 = (String) pageContext.findAttribute("name3");
String name4 = (String) pageContext.findAttribute("name4");
%>
<h1>取出的值:</h1>
<h1><%=name1%></h1>
<h1><%=name2%></h1>
<h1><%=name3%></h1>
<h1><%=name4%></h1>
</body>
</html>