我正在使用 Java Servlet 开发 Web 应用程序。我正在尝试实现登录、注销和注册功能，但我对如何让一切正常工作感到有些困惑。以下是登录页面的代码：
To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package hw5package;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import java.util.UUID;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
*
* @author Tyler
*/
public class Login extends HttpServlet {
/**
* Processes requests for both HTTP
* <code>GET</code> and
* <code>POST</code> methods.
*
* @param request servlet request
* @param response servlet response
* …