jsp登录页面的简单实例雏形

2019-10-27 18:00:19

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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：

jsp登录页面

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  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>

jsp登录页面

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  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>

jsp登录页面

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>

jsp登录页面

登录时，密码出错：5秒后重新登录

jsp登录页面

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>

jsp登录页面