Java 连接到postgres数据库

我正在尝试连接到PostgreSQL数据库，但它显示找不到文件

我从表单中获取输入，并尝试在DB中添加这些输入。 我的代码正确吗？数据库正在Netbeans中连接，但未联机获取值

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import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Admin
 */
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
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException, ClassNotFoundException {
        response.setContentType("text/html;charset=UTF-8");
         String name= request.getParameter("name");
          String lname= request.getParameter("lname");
          String dob= request.getParameter("dob");
          String email=request.getParameter("email");
          String password = request.getParameter("password");
          String mobilenumber= request.getParameter("mobilenumber");
          String epertiselevel=request.getParameter("epertiselevel");

        try (PrintWriter out = response.getWriter()) {
            /* TODO output your page here. You may use following sample code. */
             Class.forName("org.postgresql.Driver");
           Connection con =DriverManager.getConnection
                     ("jdbc:postgresql://localhost:5434/mydb","postgres","admin");
              PreparedStatement ps=con.prepareStatement("insert into \"public\".\"user\"  values('"+name+"','"+dob+"','"+email+"','"+password+"','"+mobilenumber+"','"+epertiselevel+"')");
               ps.setString(1, name);
        ps.setString(2, lname);
        ps.setString(3, dob);
        ps.setString(4, email);
        ps.setString(5, password);
        ps.setString(6, mobilenumber);
        ps.setString(7, epertiselevel);
          Statement stmt=con.createStatement();
            int i = 0;
           if(i>0)
          {
            out.println("You are sucessfully registered");
          }else{
      out.println("Failed in  registration");
      }
        } catch (SQLException se) {
           se.printStackTrace();
        }

    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            processRequest(request, response);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(login.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            processRequest(request, response);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(login.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}

h1{背景色：橙色；颜色：白色；} 正文{背景色：浅蓝色} 报名 姓名： 姓氏： 出生日期： 电邮： 暗语 手机号码： 生物多样性专业水平：Begginer 中间的 先进的 没有什么

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最初我试图通过servlet连接t postgres 但现在我在jsp中编写这段代码时，它工作正常了 我正在演示与postgres的连接。 尝试通过jsp连接到postgres

jsp代码 h1{背景色：橙色；颜色：白色；} 正文{背景色：浅蓝色} 报名 0 { out.println您已成功注册； }否则{ out.println注册失败； } } Catchse { se.printStackTrace； } %> !DOCTYPE HTML> 登记 HJJ 用户名： 用户电子邮件ID: 用户密码：

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请显示您的stacktraceAlso您正在使用PreparedStation，但附加值并使用set。。。MethodsOry没有让你失望坏：prepareStatementinsert到\public\。\user\values'+name+Good:ps.setString，name；