java - 我可以在项目的资源文件夹中看到图像，但仍然收到无效网址错误

Question

所以我有一个程序，用户可以上传图像，然后将其和产品保存到在线商店。但我遇到了一个非常奇怪的问题，没有一个文件名被识别。基本上，用户使用文件选择器在本地上传文件。我已经尝试过将其保存到我的资源文件夹中，我已经尝试过将其保存到资源/图像中，并且尝试将其保存到主/图像中，并且每次发生同样的事情时。用户选择他们想要上传的照片，我看着它转到正确的文件夹，但是当用户单击上传并创建新产品时，会出现错误，指出无效的网址或资源不存在。事情是这样的。该资源确实存在。我看着它出现在我的 Intellij 项目窗口中。我什至将文件的路径打印到控制台，以防它去其他地方，但不，这是正确的文件路径。我想也许有一些奇怪的拼写错误，所以我将文件拖到终端，但不，它是确切的文件路径。我要疯狂地想弄清楚这一点。

上传发生的位置

public class UploadItems {

    @FXML private TextField productName;
    @FXML private TextField quantityForSale;
    @FXML private TextField prices;
    @FXML private Image image;
    @FXML private Button imageUploadBtn;
    @FXML private Button uploadBtn;
    private MainController mainController;
    private File file;
    private ConnectToDb connectToDb = new ConnectToDb();
    private StoreHomePageController storeHomePageController;
    private final String fileLocation = "/Users/myname/IdeaProjects/AmeenazonOnlineStore/src/main/Images";

    public UploadItems(){
        mainController = new MainController();
        storeHomePageController = new StoreHomePageController(mainController);

    }
    @FXML
    private void initialize(){

        imageUploadBtn.setOnAction(e -> {
            uploadImageBtn();
        });
        uploadBtn.setOnAction(e -> {
            uploadBtn();

        });
    }
    private void uploadBtn(){
        String name = productName.getText();
        String otherFileLocation = "/Users/myname/IdeaProjects/AmeenazonOnlineStore/src/main/Images/";
        int quantity = Integer.parseInt(quantityForSale.getText());
        int price = Integer.parseInt(prices.getText());
        String filename = otherFileLocation + file.getName();

        if (!name.isEmpty() && quantity > 0 && price > 0){
            String query = " INSERT INTO products(name, price, quantity, filename)"
                    + " VALUES(?, ?, ?, ?)";
            try {
                PreparedStatement preparedStatement = connectToDb.getConn().prepareStatement(query);
                preparedStatement.setString(1, name);
                preparedStatement.setInt(2, price);
                preparedStatement.setInt(3, quantity);
                preparedStatement.setString(4, filename);

                if (checkTableForProduct()){
// error is thrown here because the filename is invalid. printing to the console right here will show the valid file name
                    storeHomePageController.addToVBoxList(new Product(name, price, quantity, filename));

                    System.out.println("product added... hopefully ");
                    Alert alert = new Alert(Alert.AlertType.INFORMATION);
                    alert.setTitle("Item Successfully Uploaded!");
                    alert.setHeaderText("You can now sell your stuff. We can't wait for our cut");
                    alert.setContentText("You better not stiff us or we'll send our goons out to get you!");
                    alert.showAndWait();
                }
            } catch (SQLException ex) {
                ex.printStackTrace();
            } try {

                Window window = uploadBtn.getScene().getWindow();
                window.hide();
                FXMLLoader loader = new FXMLLoader(getClass().getResource("/StoreHomePageLayout.fxml"));
                loader.setController(new StoreHomePageController(mainController));
                Stage secondaryStage = new Stage();
                secondaryStage.setTitle("Ameenazon");
                secondaryStage.setHeight(800);
                secondaryStage.setWidth(800);
                Scene scene = new Scene(loader.load());
                secondaryStage.setScene(scene);
                secondaryStage.show();

            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
    private void uploadImageBtn(){
        String otherFileLocation = "/Users/myname/IdeaProjects/AmeenazonOnlineStore/src/main/Images/";
        Stage stage = new Stage();
        FileChooser fileChooser = new FileChooser();
        fileChooser.setTitle("Select Image");

        file = fileChooser.showOpenDialog(stage);
        if (file != null){
            Path movefrom = FileSystems.getDefault().getPath(file.getPath());
            Path target = FileSystems.getDefault().getPath(otherFileLocation  +  file.getName());
            imageUploadBtn.getProperties().put(otherFileLocation, file.getAbsolutePath());
            System.out.println("image upload button ");
            try{
                Files.move(movefrom,target, StandardCopyOption.ATOMIC_MOVE);
                System.out.println("image moved");
            } catch (IOException ex){
                ex.printStackTrace();
            }
        }
    }

这是产品类别

public class Product {

    private String name;
    private String companyName;
    private double price;
    private int quantity;
    private String description;
    private ImageView imageView;
    private String fileName;
    private String info;
    private Image image;
 quantity, String description, Image image, String fileName, String info){
    public Product(String name, double price, int quantity, String fileNames)  {
        this.name = name;
        this.companyName = companyName;
        this.price = price;
        this.description = description;
        this.imageView = imageView;
        this.quantity = quantity;
        this.fileName = fileNames;
        System.out.println(this.fileName);
        System.out.println(fileNames);
// these both print the correct file path to the correct file which I can see in my project window 
        this.info = info;
        this.image = new Image(fileNames);
// a bunch of getters
}

所以是的，我不知道发生了什么。这是因为我在 FXML 初始化中设置按钮操作吗？我可以看到 .png 文件已添加到我的项目中。当我可以在正确的文件夹中看到它时，我收到无效的网址或资源不存在错误，这对我来说没有意义。我什至可以将文件的视频剪辑添加到正确的位置，然后说那里没有文件。

将产品添加到首页的方法就可以了。它在过去曾发挥过作用。实际上只是文件名给了我一个错误。

谢谢

Answer 1

Image 构造函数需要一个 URL，而不是文件名。你缺少一个计划；此外，有效的文件名可能不是有效的 URL。

使用文件或路径功能转换为URL:

String filename = new File(otherFileLocation + file.getName()).toURI().toString();