如何在javafx中使用sqlite创建登录应用程序

Question

我只是使用sqlite数据库在javafx中创建登录应用程序但是当我点击它不显示登录berhasil时，我该怎么办？我一直在寻找，但我没有得到针对我的问题的特定答案。

这是我的登录控制器

package sample;

import com.jfoenix.controls.JFXPasswordField;
import com.jfoenix.controls.JFXTextField;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;


import java.net.URL;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ResourceBundle;

public class Controller implements Initializable{
    @FXML
    private JFXTextField username;
    @FXML
    private JFXPasswordField password;
    @FXML
    private Label pemberitahuan;

    @Override
    public void initialize(URL location, ResourceBundle resources) {

    }



    public void loginButton(ActionEvent event) throws Exception {


        String user = username.getText();
        String pass = password.getText();

        try {
            DbConnection database = new DbConnection();
            Connection connection = database.getConnection();
            Statement statement = connection.createStatement();
            ResultSet resultSet = statement.executeQuery("SELECT * FROM admin");

            while (resultSet.next()) {
                if (user.equals(resultSet.getString('2'))
                        && pass.equals(resultSet.getString('3'))) {
                    System.out.println("login berhasil");
                    pemberitahuan.setText("login berhasil");
                }
            }


        }catch (SQLException ex) {
            ex.printStackTrace();
        }



    }
}

db connection class

    package sample;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

/**
 * Created by agungaprian on 30/04/17.
 */
public class DbConnection {
    Connection connection;
    String username = "root";
    String password = "";
    String url = "jdbc:sqlite:posapp.db";



    public Connection getConnection () throws SQLException {


        try{
            connection = DriverManager.getConnection(url,username,password);
            System.out.println("connect to database");
        }catch (SQLException ex) {
            System.out.println("not connected to database");
            ex.printStackTrace();
        }

        return connection;
    }

}

fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import com.jfoenix.controls.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.text.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>

<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
   <children>
      <HBox prefHeight="400.0" prefWidth="600.0">
         <children>
            <VBox prefHeight="400.0" prefWidth="600.0">
               <children>
                  <AnchorPane prefHeight="400.0" prefWidth="600.0">
                     <children>
                        <Text layoutX="153.0" layoutY="78.0" strokeType="OUTSIDE" strokeWidth="0.0" text="Login Test Sqlite" AnchorPane.leftAnchor="153.0" AnchorPane.rightAnchor="147.380859375">
                           <font>
                              <Font size="36.0" />
                           </font>
                        </Text>
                        <Separator layoutX="121.0" layoutY="113.0" prefHeight="0.0" prefWidth="379.0" AnchorPane.leftAnchor="121.0" AnchorPane.rightAnchor="100.0" />
                        <GridPane layoutX="172.0" layoutY="149.0" prefHeight="152.0" prefWidth="261.0" AnchorPane.leftAnchor="172.0" AnchorPane.rightAnchor="167.0">
                          <columnConstraints>
                            <ColumnConstraints hgrow="SOMETIMES" maxWidth="124.0" minWidth="10.0" prefWidth="85.0" />
                            <ColumnConstraints hgrow="SOMETIMES" maxWidth="183.0" minWidth="10.0" prefWidth="176.0" />
                          </columnConstraints>
                          <rowConstraints>
                            <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                            <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                            <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                          </rowConstraints>
                           <children>
                              <JFXTextField fx:id="username" GridPane.columnIndex="1" />
                              <Text strokeType="OUTSIDE" strokeWidth="0.0" text="username" />
                              <Text strokeType="OUTSIDE" strokeWidth="0.0" text="password" GridPane.rowIndex="1" />
                              <JFXPasswordField fx:id="password" GridPane.columnIndex="1" GridPane.rowIndex="1" />
                              <JFXButton onAction="#loginButton" prefHeight="25.0" prefWidth="69.0" style="-fx-background-color: #aaa999;" text="Button" textFill="#212121" GridPane.columnIndex="1" GridPane.halignment="RIGHT" GridPane.rowIndex="2" />
                           </children>
                        </GridPane>
                        <Label fx:id="pemberitahuan" layoutX="323.0" layoutY="326.0" prefHeight="15.0" prefWidth="117.0" textFill="#cd0909" AnchorPane.leftAnchor="323.0" AnchorPane.rightAnchor="160.0" />
                     </children>
                  </AnchorPane>
               </children>
            </VBox>
         </children>
      </HBox>
   </children>
</AnchorPane>