Question

我正在制作一个显示滑雪胜地天气数据的Java应用程序。在用户登录后，它会创建一个场景，其中包含一个带有动态创建的选项卡的选项卡窗格，每个用户都可以使用一个选项卡。所有数据都存储在mysql数据库中。

我能够为每个用户成功创建所有选项卡，现在我正在尝试使用ImageView对象将与每个度假村关联的图像加载到正在加载的每个选项卡中。我不知道为什么，但我无法在任何标签中显示任何图像。理想情况下，我想获取图像文件的名称，我已存储在我的数据库中，创建文件路径字符串并加载图像。我也试过硬编码文件路径，并在场景构建器中设置图像，但都没有工作。

我的收藏夹控制器，其中包含tabPane并动态创建标签

@FXML
private TabPane tabPane;
private Tab myTab;

/**
 * Initializes the controller class.
 * @param url
 * @param rb
 */
@Override
public void initialize(URL url, ResourceBundle rb) {
    try {
        DBConnect dbConnection = new DBConnect();
        // GET USER ID, THEN ARRAY OF THE ID'S FAVORITE RESORTS
        int id = LoggedInUser.id;
        //string array of the names of the users favorited resorts
        String[] resorts = dbConnection.getFavorites(id);

        // DYNAMICALLY CREATE TABS BASED ON THE NUMBER OF FAVORITES FOR THE ACTIVE USER.
        for(int i = 0; i < resorts.length; i++) {
            FXMLLoader loader = new FXMLLoader();
            ResortTab newTabController = new ResortTab(resorts[i]);
            loader.setLocation(getClass().getResource("ResortTab.fxml"));
            loader.setController(newTabController);

            Parent parent = loader.load();
            myTab = new Tab(resorts[i]);
            myTab.setContent(parent); 
            tabPane.getTabs().add(myTab);
        }

    } catch (SQLException | ClassNotFoundException | IOException ex) {
        Logger.getLogger(FavoritesController.class.getName()).log(Level.SEVERE, null, ex);
    }

}

ResortTab，动态创建标签的控制器

public class ResortTab implements Initializable{
String name;
DBConnect dbConnection;
private Image image;
private String resort;


@FXML
private Label label;
@FXML
private ImageView logo;

// CONSTRUCTOR
public ResortTab(String name) throws SQLException, ClassNotFoundException {
    resort = name;
    this.name = name;
    // GET LOGO FILE PATH FROM DATABASE AND LOAD IT TO THE SCENE
    dbConnection = new DBConnect();
    //returns file path thats stored in the database example: images/Logos/resortname.jpg
    String path = dbConnection.getLogoPath(name); 

    System.out.println("'src/jesnwdskiweather/" + path + "'");
    System.out.println("Working Directory = " + System.getProperty("user.dir"));

    // Create full path 
    String full_path = "file:'/src/jesnwdskiweather/" + path + "'";

    // String used to test by hardcoding
    String testPath = "file:'src/jesnwdskiweather/images/Logos/RevelstokeMountain.png'";

    System.out.println(full_path); //prints correct file path
    image = new Image(full_path);
    if(image == null){
        System.out.println("Image is null"); //does not print
    }

}

@Override
public void initialize(URL location, ResourceBundle resources) {
    logo.setImage(image);
    logo.setCache(true);
    label.setText(name);
}

ResortTab.fxml

<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.image.*?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?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">
  <children>
     <Label fx:id="label" layoutX="342.0" layoutY="112.0" text="Label" />
     <ImageView fx:id="logo" fitHeight="150.0" fitWidth="200.0" pickOnBounds="true" preserveRatio="true" />
  </children>
</AnchorPane>

Answer 1

我尝试复制您的代码并进行一些更改以找到错误，我发现您的错误在String full_path = "file:'/src/jesnwdskiweather/" + path + "'";，并且您不需要在路径中添加/src/，请参阅说明

虚假路径：

真实路径：

尝试更改String full_path = "jesnwdskiweather/" + path";

的完整路径

包含一些更改的源代码：

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package stackoverflow;

import java.net.URL;
import java.sql.SQLException;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;

/**
 * FXML Controller class
 *
 * @author Electron
 */
public class ResortTab implements Initializable {

    String name;
    private Image image;
    private String resort;
    @FXML
    private Label label;
    @FXML
    private ImageView logo;

// CONSTRUCTOR
    public ResortTab(String name) throws SQLException, ClassNotFoundException {
        resort = name;
        this.name = name;
        // GET LOGO FILE PATH FROM DATABASE AND LOAD IT TO THE SCENE
      //  dbConnection = new DBConnect();
        //returns file path thats stored in the database example: images/Logos/resortname.jpg
        String path = "1487868084_39_Email_Marketing.png";

        System.out.println("'src/jesnwdskiweather/" + path + "'");
        System.out.println("Working Directory = " + System.getProperty("user.dir"));

        // Create full path 
        String full_path = "jesnwdskiweather/" + path +"";

        // String used to test by hardcoding
        String testPath = "file:'src/jesnwdskiweather/images/Logos/RevelstokeMountain.png'";

        System.out.println(full_path); //prints correct file path
        image = new Image(full_path);
        if (image == null) {
            System.out.println("Image is null"); //does not print
        }

    }

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        logo.setImage(image);
        logo.setCache(true);
        label.setText(name);
    }
}

注意：如果您需要使用setGraphic(node);将标签添加到每个标签页中，您的代码会将标签添加到选项卡标注的每个内容中。

JAVAFX FXML：动态创建的选项卡中的动态ImageView无法显示

1 个答案: