jsp登录页面的简单实例 雏形

时间：2021-05-26

jsp登录页面的简单实例 雏形

<%@ 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>欢迎页面</title></head><body><%session.invalidate();//销毁session%><a href="denglu.jsp" >亲，请登录</a><a href="zhuce.jsp">注册</a></body></html>

欢迎界面：

尚未注册，直接登录的时候：

<%@ 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>登录</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登录</font></td></tr> <tr height="30"> <td width="80" align="right">用户名：</td> <td><input type="text" name="username"></td></tr> <tr height="30"> <td width="80" align="right"> 密&nbsp;&nbsp;码：</td> <td> <input type="password" name="password"></td></tr> <tr><td height="40" align="center" colspan="2"> <input type="submit" value="登录"> </td></tr> </table></form></body></html>

进入注册界面：

<%@ 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>注册</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注册</font></td></tr> <tr height="30"> <td width="80" align="right">用户名：</td> <td><input type="text" name="username"></td></tr> <tr height="30"> <td width="80" align="right"> 密&nbsp;&nbsp;码：</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>

注册成功，跳转登录界面：

<%@ 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>检测跳转中</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{ //连接数据库 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("数据库连接成功"); Statement st = conn.createStatement(); ResultSet rs = st.executeQuery(str); if(rs.next()){ if(name.equals(rs.getString(2))){ out.println("对不起，用户名已使用。"); out.println("<br>建议使用用户名：" + name +"99"); response.setHeader("refresh", "5;URL=zhuce.jsp"); } }else{ int a = st.executeUpdate(str1); if(a == 1){ out.println("恭喜你，注册成功"); 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>

登录时，密码出错：5秒后重新登录

账号密码输入正确，进入主页面：

<%@ 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>主页面</title></head><body>主页面<%Object obj = session.getAttribute("username");if(obj != null){ String str = obj.toString(); out.println(str + "登陆成功");}else{ out.println("登录超时，请重新登录"); response.setHeader("refresh", "5;URL=denglu.jsp");}%><br><a href="yemian.jsp">退出账号</a></body></html>

以上就是小编为大家带来的jsp登录页面的简单实例 雏形全部内容了，希望大家多多支持~

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