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>
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时间： 2024-09-23 00:03:45