jsp登陆注册代码

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Register</title>
</head>
<body>
    <h2>Register</h2>
    <form action="registerProcess.jsp" method="post">
        Username: <input type="text" name="username"><br><br>
        Password: <input type="password" name="password"><br><br>
        <input type="submit" value="Register">
    </form>
</body>
</html>

<%@ page import="java.sql.*" %>
<%
    String username = request.getParameter("username");
    String password = request.getParameter("password");

    Connection conn = null;
    PreparedStatement pstmt = null;
    try {
        Class.forName("com.mysql.jdbc.Driver");
        conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "password");
        String sql = "INSERT INTO users (username, password) VALUES (?, ?)";
        pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, username);
        pstmt.setString(2, password);
        pstmt.executeUpdate();
        out.println("Registration successful!");
    } catch (Exception e) {
        out.println("Error: " + e.getMessage());
    } finally {
        if (pstmt != null) pstmt.close();
        if (conn != null) conn.close();
    }
%>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Login</title>
</head>
<body>
    <h2>Login</h2>
    <form action="loginProcess.jsp" method="post">
        Username: <input type="text" name="username"><br><br>
        Password: <input type="password" name="password"><br><br>
        <input type="submit" value="Login">
    </form>
</body>
</html>

<%@ page import="java.sql.*" %>
<%
    String username = request.getParameter("username");
    String password = request.getParameter("password");

    Connection conn = null;
    PreparedStatement pstmt = null;
    ResultSet rs = null;
    try {
        Class.forName("com.mysql.jdbc.Driver");
        conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "password");
        String sql = "SELECT * FROM users WHERE username = ? AND password = ?";
        pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, username);
        pstmt.setString(2, password);
        rs = pstmt.executeQuery();
        if (rs.next()) {
            out.println("Login successful!");
        } else {
            out.println("Invalid username or password.");
        }
    } catch (Exception e) {
        out.println("Error: " + e.getMessage());
    } finally {
        if (rs != null) rs.close();
        if (pstmt != null) pstmt.close();
        if (conn != null) conn.close();
    }
%>