jsp登录页面的简单实例 雏形

前端技术 2023/09/02 JSP

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  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phpstudy~

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