JAVA第8周作业
1.
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title>My JSP 'index.jsp' starting page</title> </head> <body> <script type="text/javascript"> function validate(){ if(loginForm.uname.value==""){ alert("账号不能为空!"); return; } if(loginForm.upwd.value==""){ alert("密码不能为空!"); return; } loginForm.submit(); } </script> <form name="loginForm" action="dologin.jsp" method="post"> 用户名:<input type="text" name="uname" ><br> 密码: <input type="password" name="upwd" > <input type="button" value="登录" onClick="validate()"> </form> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% request.setCharacterEncoding("utf-8"); String uname = request.getParameter("uname"); String upwd = request.getParameter("upwd"); if (uname.equals(upwd)){ //转发到ok页面,但是url没变 session.setAttribute("uname", uname); request.getRequestDispatcher("main.jsp").forward(request,response); } else{ //重定向回login.jsp,浏览器url也变 response.sendRedirect("no.jsp"); } %>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title>My JSP 'index.jsp' starting page</title> </head> <body> <% String uname=(String)session.getAttribute("uname"); //如果他是空,说明没登陆,直接访问该页面了 if(uname==null) response.sendRedirect("login.jsp"); %> 欢迎你<%=uname %> <a href="logout.jsp">退出登录</a> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title>My JSP 'index.jsp' starting page</title> </head> <body> <% session.invalidate(); response.setHeader("refresh", "5;url=login.jsp"); %> 退出成功 </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title>My JSP 'index.jsp' starting page</title> </head> <body> <h1>登陆失败!!</h1> <%response.setHeader("refresh", "5;url=login.jsp");%> </body> </html>
2.
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title>My JSP 'index.jsp' starting page</title> </head> <body> <% String uname = (String) session.getAttribute("uname"); //如果他是空,说明没登陆,直接访问该页面了 if (uname == null) response.sendRedirect("login.jsp"); %> 欢迎你<%=uname%> <a href="logout.jsp">退出登录</a> <hr> 商品展示: <br> <hr> <form action="show.jsp" method="post"> 请选择要加入购物车的商品:
<br> <input type="checkbox" name="list" value="苹果"> 苹果 ¥9.9<br> <input type="checkbox" name="list" value="香蕉"> 香蕉 ¥8.8<br> <input type="checkbox" name="list" value="橘子"> 橘子 ¥7.7<br> <hr> <input type="submit" value="加入购物车"> </form> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title>My JSP 'index.jsp' starting page</title> </head> <body> <h2>购物车添加的商品有:</h2> <% request.setCharacterEncoding("utf-8"); String listName[] = request.getParameterValues("list"); if (listName == null) { out.print("购物车为空!"); } else { for (int i = 0; i < listName.length; i++) { out.print("(" + (i + 1) + ")" + listName[i] + "<br>"); } } %> </body> </html>