JSP隐式对象
<%-- Created by IntelliJ IDEA. User: zengy Date: 2022/2/2 Time: 0:00 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@ page errorPage="error.jsp" %> <html> <head> <title>exception 隐式对象</title> </head> <body> <%! int div = 0; int res = 0; %> <% res = 23 / div; %> </body> </html>
<%-- Created by IntelliJ IDEA. User: zengy Date: 2022/2/2 Time: 0:03 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" isErrorPage="true" %> <html> <head> <title>error</title> </head> <body> 出错了<br> <%= exception.getMessage() %> <% exception.printStackTrace(); %> </body> </html>
<%@ page import="java.util.Date" %> <%@ page import="java.text.SimpleDateFormat" %> <%@ page pageEncoding="UTF-8" buffer="16kb" %> <%-- 使用taglib 指令设置引入自定义标签信息 --%> <%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>$Title$</title> </head> <body> <%@ include file="view/top.jsp" %> <%-- 声明变量定义方法 --%> <%! String mess = "";// void sayHello(String name,String sex){ if (sex.equals("男")) mess = "你好！"+name+" 先生"; else mess = "你好！"+name+" 女士"; } %> <% sayHello("King","男"); Date dat = new Date(); SimpleDateFormat sim = new SimpleDateFormat(); %> <%=mess%> <c:if test="${17 >=18}"> <h2>您是成年人</h2> </c:if> <c:if test="${17 < 18}"> <h2>你是未成年人</h2> </c:if> </body> </html>
<%-- Created by IntelliJ IDEA. User: zengy Date: 2022/2/1 Time: 15:00 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>用户登录界面</title> </head> <body> <form action="doLogin.jsp" method="post"> <input name="userName" type="text"/><br> <input name="password" type="password"/><br> <input type="submit" value="登录"> </form> </body> </html>
<%-- Created by IntelliJ IDEA. User: zengy Date: 2022/2/1 Time: 15:00 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@page import="com.xzit.pojo.Users" %> <html> <head> <title>处理用户登录界面</title> </head> <body> <% /*使用request对象获取用户提交的请求参数*/ String name = request.getParameter("userName"); String pwd = request.getParameter("password"); if (name!=null && !name.equals("") && name.equals("admin") && pwd!=null && !pwd.equals("") && pwd.equals("123456")){ Users current = new Users(name,pwd); //将对象存放在会话Session作用域中 session.setAttribute("currentUser",current); } %> <a href="index.jsp">访问主页面</a> </body> </html>
<%-- Created by IntelliJ IDEA. User: zengy Date: 2022/2/1 Time: 13:33 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>out 和 response 隐式对象</title> </head> <body> <%! String language = ""; String hy = ""; String checkLanguage(String lan){ if (lan.equals("python")) return "人工智能"; else if (lan.equals("java")) return "企业级开发"; else return "其它领域"; } %> <% hy = checkLanguage(language); //使用response隐式对象实现请求的重定向动作 if (hy.equals("人工智能")) response.sendRedirect("ygzn.jsp"); else if (hy.equals("企业级开发")) response.sendRedirect("qyjkf.jsp"); else response.sendRedirect("other.jsp"); %> 适合的领域是：<%out.write(hy);%> </body> </html>
<%-- Created by IntelliJ IDEA. User: zengy Date: 2022/2/1 Time: 13:52 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> 欢迎来到其它语言学习页面 </body> </html>
<%-- Created by IntelliJ IDEA. User: zengy Date: 2022/2/1 Time: 16:41 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>pageContext作用域</title> </head> <body> <% pageContext.setAttribute("mess","welcome"); //request请求域中存储对象，在同一个请求域中是可以获取到的 request.setAttribute("mess2","King"); %> </body> 当前从pageContext作用域中取出对象：<%=pageContext.getAttribute("mess")%><br> 当前从request作用域中取出对象：<%=request.getAttribute("mess2")%> <% request.getRequestDispatcher("page2.jsp").forward(request,response); %> </html>
<%-- Created by IntelliJ IDEA. User: zengy Date: 2022/2/1 Time: 16:41 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>pageContext作用域</title> </head> <body bgcolor="blue"> </body> <%= pageContext.getAttribute("mess") %> 当前从request作用域中取出对象：<%=request.getAttribute("mess2")%> </html>
<%-- Created by IntelliJ IDEA. User: zengy Date: 2022/2/1 Time: 13:52 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> 欢迎来到企业级开发页面 </body> </html>
<%-- Created by IntelliJ IDEA. User: zengy Date: 2022/2/1 Time: 13:52 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> 欢迎来到人工智能学习页面 </body> </html>
