jsp登錄頁面的簡單實例雛形

2024-09-05 00:22:36

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jsp登錄頁面的簡單實例雛形

<%@ page language="java" contentType="text/html; charset=UTF-8"  pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>歡迎頁面</title></head><body><%session.invalidate();//銷毀session%><a href="denglu.jsp" >親，請登錄</a><a href="zhuce.jsp">注冊</a></body></html>

歡迎界面：

jsp登錄頁面

尚未注冊，直接登錄的時候：

<%@ page language="java" contentType="text/html; charset=UTF-8"  pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>登錄</title></head><body><form action="test_denglu.jsp" method="post"> <table width="300" height="300" border="0" align="center">  <tr height="80" align="center">    <td colspan="2"><font size="24">OO登錄</font></td></tr>  <tr height="30">    <td width="80" align="right">用戶名：</td>                 <td><input type="text" name="username"></td></tr>  <tr height="30">    <td width="80" align="right"> 密  碼：</td>    <td> <input type="password" name="password"></td></tr>    <tr><td height="40" align="center" colspan="2">    <input type="submit" value="登錄">    </td></tr> </table></form></body></html>

jsp登錄頁面

進入注冊界面：

<%@ page language="java" contentType="text/html; charset=UTF-8"  pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>注冊</title></head><body><form action="test_zhuce.jsp" method="post"> <table width="300" height="300" border="0" align="center">  <tr height="80" align="center">    <td colspan="2"><font size="24">OO注冊</font></td></tr>  <tr height="30">    <td width="80" align="right">用戶名：</td>                 <td><input type="text" name="username"></td></tr>  <tr height="30">    <td width="80" align="right"> 密  碼：</td>    <td> <input type="password" name="password"></td></tr>    <tr><td height="40" align="center" colspan="2">    <input type="submit" value="提交">    </td></tr> </table></form></body></html>

jsp登錄頁面

注冊成功，跳轉登錄界面：

<%@ page language="java" contentType="text/html; charset=UTF-8"  pageEncoding="UTF-8" import="java.sql.*"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>檢測跳轉中</title></head><body><%String name = new String(request.getParameter("username").getBytes("ISO-8859-1"),"UTF-8");String pw = request.getParameter("password"); String str = "select * from USERS WHERE username = '" + name + "'";String str1 = "insert into users values(xuhao.nextval,'" + name + "','" + pw +"')";try{     //連接數據庫   Connection conn = null;   Class.forName("oracle.jdbc.driver.OracleDriver");   String strURL = "jdbc:oracle:thin:@localhost:1521:SP";   conn = DriverManager.getConnection(strURL, "test", "123");   System.out.println("數據庫連接成功");   Statement st = conn.createStatement();   ResultSet rs = st.executeQuery(str);   if(rs.next()){     if(name.equals(rs.getString(2))){       out.println("對不起，用戶名已使用。");       out.println("<br>建議使用用戶名：" + name +"99");        response.setHeader("refresh", "5;URL=zhuce.jsp");     }   }else{     int a = st.executeUpdate(str1);     if(a == 1){       out.println("恭喜你，注冊成功");       session.setAttribute("username", name);       response.setHeader("refresh", "3;URL=denglu.jsp");     }   }      rs.close();   st.close();   conn.close();}catch(Exception e){  e.printStackTrace();}%><br><br></body></html>

jsp登錄頁面

登錄時，密碼出錯：5秒后重新登錄

jsp登錄頁面

賬號密碼輸入正確，進入主頁面：

<%@ page language="java" contentType="text/html; charset=UTF-8"  pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>主頁面</title></head><body>主頁面<%Object obj = session.getAttribute("username");if(obj != null){  String str = obj.toString();  out.println(str + "登陸成功");}else{  out.println("登錄超時，請重新登錄");   response.setHeader("refresh", "5;URL=denglu.jsp");}%><br><a href="yemian.jsp">退出賬號</a></body></html>

jsp登錄頁面