使用来自MySQL数据库的图像和其他数据填充JavaFX TableView

Question

我正在尝试将数据显示为JavaFX TableView形式的MySQL 数据库，其中的一列将包含来自 数据库。但除了图片列外，所有列均已填充。我的代码如下：

SrcLnugsCandidate

package application;            

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;

public class SrcLnugsCandidate {
    private final SimpleStringProperty candID;
    private final SimpleStringProperty candFirstname;
    private final SimpleStringProperty candLastname;
    private final SimpleStringProperty candPosition;
    private ImageView image;

    public SrcLnugsCandidate(String candID, String candFirstname, String candLastname, String candPosition,ImageView imageView) throws IOException {
        this.candID = new SimpleStringProperty(candID);
        this.candFirstname = new SimpleStringProperty(candFirstname);
        this.candLastname = new SimpleStringProperty(candLastname);
        this.candPosition = new SimpleStringProperty(candPosition);
        this.image = imageView;
    }

    public ImageView getIv() {
        return image;
    }

    public final void setIv(ImageView imageView) {
        this.image = imageView;
    }

    public final SimpleStringProperty candIDProperty() {
        return this.candID;
    }

    public final String getCandID() {
        return this.candIDProperty().get();
    }

    public final void setCandID(final String candID) {
        this.candIDProperty().set(candID);
    }

    public final SimpleStringProperty candFirstnameProperty() {
        return this.candFirstname;
    }

    public final String getCandFirstname() {
        return this.candFirstnameProperty().get();
    }

    public final void setCandFirstname(final String candFirstname) {
        this.candFirstnameProperty().set(candFirstname);
    }

    public final SimpleStringProperty candLastnameProperty() {
        return this.candLastname;
    }

    public final String getCandLastname() {
        return this.candLastnameProperty().get();
    }

    public final void setCandLastname(final String candLastname) {
        this.candLastnameProperty().set(candLastname);
    }

    public final SimpleStringProperty candPositionProperty() {
        return this.candPosition;
    }

    public final String getCandPosition() {
        return this.candPositionProperty().get();
    }

    public final void setCandPosition(final String candPosition) {
        this.candPositionProperty().set(candPosition);
    }   
}

BallotScreenController

package application;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ResourceBundle;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;

public class BallotScreenController implements Initializable{

    @FXML
    TableView<SrcLnugsCandidate> candTV;

    @FXML
    TableColumn<SrcLnugsCandidate, String> candIDTC;

    @FXML
    TableColumn<SrcLnugsCandidate, String> fnameTC;

    @FXML
    TableColumn<SrcLnugsCandidate, String> lnameTC;

    @FXML
    TableColumn<SrcLnugsCandidate, String> policiesTC;

    @FXML
    TableColumn<SrcLnugsCandidate, ImageView> photoTC;

    @FXML 
    ImageView iv1;

    Connection myConnection = DBConnection.dbConnect();
    ResultSet rsS;
    private ObservableList<SrcLnugsCandidate> data2;


    @Override
    public void initialize(URL arg0, ResourceBundle arg1) {
        try {
                this.data2 = FXCollections.observableArrayList();
                rsS = myConnection.createStatement().executeQuery("SELECT * FROM srcpresident");
                while (rsS.next()) {
                    InputStream is = rsS.getBinaryStream(6);
                    OutputStream os = new FileOutputStream(new File("photo.jpg"));
                    byte[] contents = new byte[1024];
                    int size = 0;

                    while((size = is.read(contents)) != -1) {
                        os.write(contents, 0 , size);
                    }

                    Image image = new Image("file:photo.jpg");
                    iv1.setImage(image);
                    this.data2.add(new SrcLnugsCandidate(rsS.getString(1), rsS.getString(2), rsS.getString(3), rsS.getString(5),iv1));
                    this.candIDTC.setCellValueFactory(new PropertyValueFactory<SrcLnugsCandidate,String>("candID"));
                    this.fnameTC.setCellValueFactory(new PropertyValueFactory<SrcLnugsCandidate,String>("candFirstname"));
                    this.lnameTC.setCellValueFactory(new PropertyValueFactory<SrcLnugsCandidate,String>("candLastname"));
                    this.policiesTC.setCellValueFactory(new PropertyValueFactory<SrcLnugsCandidate,String>("candPosition"));
                    this.photoTC.setCellValueFactory(new PropertyValueFactory<SrcLnugsCandidate,ImageView>("imageView"));

                    this.candTV.setItems(null);
                    this.candTV.setItems(data2);        
            }


        } catch (SQLException | IOException e) {
            System.out.println(e);

        }
    }
}