jsp登录页面的简单实例 雏形
16lz
2022-03-25
下面小编就为大家带来一篇jsp登录页面的简单实现 雏形。小编觉得挺不错的，现在就分享给大家，也给大家做个参考。一起跟随小编过来看看吧
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>
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>
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>
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，希望大家多多支持脚本之家~
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