JSP之登录，注册页面(一)

摘要：本系列会制作一个简单的需要JSP，servlet,oracle一起完成的登录，注册页面

1，首先需要一个登录的界面login.jsp

代码如下：

 1 <%@ page language="java" import="java.util.*" pageEncoding="GBK" contentType="text/html; charset=GBK"%>
 2 <%
 3 String path = request.getContextPath();
 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 5 %>
 6 
 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 8 <html>
 9   <head>
10     <base href="<%=basePath%>">
11     
12     <title>My JSP 'login.jsp' starting page</title>
13     
14     <meta http-equiv="pragma" content="no-cache">
15     <meta http-equiv="cache-control" content="no-cache">
16     <meta http-equiv="expires" content="0">    
17     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
18     <meta http-equiv="description" content="This is my page">
19     <!--
20     <link rel="stylesheet" type="text/css" href="styles.css">
21     -->
22 
23   </head>
24   <script type="text/javascript">
25       function func(ac) {
26         form=document.getElementById("form1");
27         form.action=ac;
28         form.submit();
29     }
30   </script>
31   <body>
32     <form  id="form1">
33     登录名:<input type="text" name="name"/><br/>
34     密&nbsp;&nbsp;码:<input type="password" name="password"/><br/>
35    <input type="button" value="登录" onclick="func('lotry')"/>
36    <input type="button" value="注册" onclick="func('regist.jsp')">
37     </form>
38 
39   </body>
40 </html>

2，需要一个用来服务登录的servlet LoginEntry.java

 1 package servlet;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.ServletException;
 6 import javax.servlet.ServletRequest;
 7 import javax.servlet.ServletResponse;
 8 import javax.servlet.annotation.WebServlet;
 9 import javax.servlet.http.HttpServlet;
10 import javax.servlet.http.HttpServletRequest;
11 import javax.servlet.http.HttpServletResponse;
12 import javax.servlet.http.HttpSession;
13 
14 import dao.userdata;
15 @WebServlet(urlPatterns={"/lotry"})
16 public class LoginEntry extends HttpServlet{
17     userdata dao;
18     HttpSession hs;
19     @Override
20     protected void service(HttpServletRequest req, HttpServletResponse res)
21             throws ServletException, IOException {
22         req.setCharacterEncoding("GBK");
23         String name=req.getParameter("name");
24         String pass=req.getParameter("password");
25         dao=userdata.getdao();
26         if(dao.login(name, pass)){
27             
28             req.getRequestDispatcher("success.jsp").forward(req, res);
29         }else{
30             req.getRequestDispatcher("failed.jsp").forward(req, res);
31         }
32     }
33     
34     
35 }

3，需要一个登录成功然后跳转的页面

 1 <%@ page language="java" import="java.util.*" pageEncoding="GBK" contentType="text/html; charset=GBK"%>
 2 <%
 3 String path = request.getContextPath();
 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 5 %>
 6 
 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 8 <html>
 9   <head>
10     <base href="<%=basePath%>">
11     
12     <title>My JSP 'success.jsp' starting page</title>
13     
14     <meta http-equiv="pragma" content="no-cache">
15     <meta http-equiv="cache-control" content="no-cache">
16     <meta http-equiv="expires" content="0">    
17     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
18     <meta http-equiv="description" content="This is my page">
19     <!--
20     <link rel="stylesheet" type="text/css" href="styles.css">
21     -->
22 
23   </head>
24   
25   <body>
26     恭喜你，成功登录
27   </body>
28 </html>

4，需要一个登录失败的跳转页面

 1 <%@ page language="java" import="java.util.*" pageEncoding="GBK" contentType="text/html; charset=GBK"%>
 2 <%
 3 String path = request.getContextPath();
 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 5 %>
 6 
 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 8 <html>
 9   <head>
10     <base href="<%=basePath%>">
11     
12     <title>My JSP 'failed.jsp' starting page</title>
13     
14     <meta http-equiv="pragma" content="no-cache">
15     <meta http-equiv="cache-control" content="no-cache">
16     <meta http-equiv="expires" content="0">    
17     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
18     <meta http-equiv="description" content="This is my page">
19     <!--
20     <link rel="stylesheet" type="text/css" href="styles.css">
21     -->
22 
23   </head>
24   
25   <body>
26     登录失败，<a href="login.jsp">请重新登录</a>
27   </body>
28 </html>