<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <% pageContext.setAttribute("userName", "itcast"); %> <% request.setAttribute("bookName", "Java Web"); %> <% session.setAttribute("userName", "itheima"); %> <% application.setAttribute("bookName", "Java 基础"); %> 表达式\${pageScope.userName}的值为：${pageScope.userName}
表达式\${requestScope.bookName}的值为：${requestScope.bookName}
表达式\${sessionScope.userName}的值为：${sessionScope.userName}
表达式\${applicationScope.bookName}的值为：${applicationScope.bookName}
表达式\${userName}的值为：${userName}