JSP第八周练习
1.登陆
输入用户名密码,判断用户名和密码相同,登陆成功,session中保存用户的用户名,进入主页main.jsp,主页有一个退出按钮,
点击,回到登陆页login.jsp。要求:退出登录后,如果在浏览器直接输入主页main.jsp,访问不了,直接跳到登陆页。
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 4 <html> 5 <head> 6 <title>登录</title> 7 </head> 8 <body> 9 <script type="text/javascript"> 10 function validate(){ 11 if(loginForm.uname.value == ""){ 12 alert("账号不能为空!"); 13 return; 14 } 15 if(loginForm.upwd.value == ""){ 16 alert("密码不能为空!"); 17 return; 18 } 19 loginForm.submit(); 20 } 21 </script> 22 <form action="dologin.jsp" name="loginForm" method="post"> 23 <table border="0" cellpadding="10"> 24 <tr><td>用户名:</td> 25 <td><input type="text" name="uname"></td> 26 </tr> 27 <tr><td>密码:</td> 28 <td><input type="password" name="upwd"></td> 29 </tr> 30 <tr> 31 <td><input type="button" value="登录" onclick="validate()"></td> 32 </tr> 33 </table> 34 </form> 35 36 </body> 37 </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(upwd.equals(uname)){ session.setAttribute("uname", uname); request.getRequestDispatcher("main.jsp").forward(request, response); }else{ response.sendRedirect("login.jsp"); } %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>登录Two</title> </head> <body> </body> </html>
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <% 3 String uname = (String) session.getAttribute("uname"); 4 if (uname == null) { 5 response.sendRedirect("login.jsp"); 6 } else { 7 8 out.print("欢迎" + uname + "登录!"); 9 } 10 %> 11 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 12 <html> 13 <head> 14 <title></title> 15 </head> 16 <body> 17 <a href="login.jsp">退出登录</a> 18 </body> 19 </html>
2.购物车
和上一题一起,在main.jsp中做一个购物车,里面显示3个商品名和价格 每一个后面有一个加入购物车按钮,
main.jsp中有一个按钮(或者超链接)可以显示购物车。(选作:在购物车中加删除按钮删除商品)
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <% 3 String uname = (String) session.getAttribute("uname"); 4 if (uname == null) { 5 response.sendRedirect("login.jsp"); 6 } else { 7 8 out.print("欢迎" + uname + "登录!"); 9 } 10 %> 11 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 12 <html> 13 <head> 14 <title></title> 15 </head> 16 <body> 17 <a href="login.jsp">退出登录</a> 18 <form action="car.jsp" method="post"> 19 <table border="1" width="600px" height="300px"> 20 <thead> 21 <tr> 22 <th>商品名称</th> 23 <th>价格</th> 24 <th>加购</th> 25 </tr> 26 </thead> 27 <tbody> 28 <tr> 29 <td>橙子</td> 30 <td>5</td> 31 <td><input type="checkbox" name="gw" value="橙子"></td> 32 </tr> 33 <tr> 34 <td>西瓜</td> 35 <td>2</td> 36 <td><input type="checkbox" name="gw" value="西瓜"></td> 37 </tr> 38 <tr> 39 <td>苹果</td> 40 <td>1</td> 41 <td><input type="checkbox" name="gw" value="苹果"></td> 42 </tr> 43 <tr> 44 <td colspan="3"><input type="submit" value="加购"></td> 45 </tr> 46 </tbody> 47 </table> 48 </form> 49 </body> 50 </html>
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 4 <html> 5 <head> 6 <title></title> 7 </head> 8 <body> 9 <%session.invalidate();%> 10 <script type="text/javascript"> 11 window.location.href="main.jsp"; 12 </script> 13 </body> 14 </html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title></title> </head> <body> <h2>购物车:</h2> <% request.setCharacterEncoding("UTF-8"); String[] gw = request.getParameterValues("gw"); if(gw == null){ out.print("购物车为空!"); }else{ for(int i = 0; i < gw.length; i++){ out.print(gw[i]+"<br>"); } } %> </body> </html>