工程目录结构
数据表
直接生成数据库与表的sql文件下载
工程文件下载
代码
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.sql.*"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>登录</title>
</head>
<%!public static final String dbDriver = "com.mysql.cj.jdbc.Driver";
public static final String dbUrl = "jdbc:mysql://localhost:3306/demo0401?useSSL=false&serverTimezone=UTC";
public static final String dbUser = "root";
public static final String dbPass = "";%>
<%
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
%>
<%
Class.forName(dbDriver); // 加载驱动程序
conn = DriverManager.getConnection(dbUrl, dbUser, dbPass); //连接
//String sql = "select * from user where";
//pstmt = conn.prepareStatement(sql);
//rs = pstmt.executeQuery();
%>
<%
//判断是否有登陆凭证
if (session.getAttribute("username") != null) {
%>
<jsp:forward page="success.jsp" />
<%
}
%>
<%
String username = request.getParameter("username");
String password = request.getParameter("password");
if (!(username == null || "".equals(username) || password == null || "".equals(password))) {
String sql = "select * from user where username=? and password=?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, username);
pstmt.setString(2, password);
rs = pstmt.executeQuery();
if (rs.next()) {
session.setAttribute("username", username);
%>
<jsp:forward page="success.jsp" />
<%
}
}
%>
<body>
<form action="login.jsp" method="post">
用户名: <input type="text" name="username"><br /> 密码：<input
type="password" name="password"><br /> <input type="submit"
value="登录"><input type="reset" value="重置">
</form>
</body>
</html>
success.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>成功页面</title>
</head>
<body>
登录成功
<br /> 你好，<%=session.getAttribute("username")%>
<a href="logout.jsp">退出登录</a>
</body>
</html>
logout.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>注销</title>
</head>
<body>
<%
session.invalidate();
response.setHeader("refresh", "0;url=login.jsp");
%>
</body>
</html>
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