题目:编写一个jsp程序,实现用户登录,当用户输入的用户名或密码错误时,将页面重定向到错误提示也,并在该页面显示30秒后,自动返回到用户登录页面.
1.用户登录页面
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7 <title>登录页</title> 8 </head> 9 <body> 10 <form name = "form1" action="denglu.jsp"> 11 12 用户名: 13 <input type = "text" name = "user"><br> 14 密码: 15 <input type = "password" name = "pw"><br> 16 <input type = "submit" name = "bt" value = "提交"> 17 18 </form> 19 20 </body> 21 </html>
2,登录处理页面
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8" %> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7 <title>登录处理页</title> 8 </head> 9 <body> 10 <% 11 //正确的用户名密码 12 String user1 = "123"; 13 String pw1 = "123"; 14 //获取输入的用户名密码 15 String user = request.getParameter("user"); 16 String pw = request.getParameter("pw"); 17 //判断用户名密码是否正确 18 if(user.equals(user1) & pw.equals(pw1)) 19 { 20 out.print("登录成功"); 21 } 22 else 23 { 24 response.sendRedirect("error.jsp"); 25 } 26 %> 27 </body> 28 </html>
3,错误提示页
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8" %> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7 <title>错误处理页</title> 8 </head> 9 <body> 10 用户名或密码错误,请稍后重试. 11 <% 12 //30秒后重定向至登录页 13 response.setHeader("refresh","30;URL = index.jsp"); 14 %> 15 </body> 16 </html>