fileStorageUploadField 文件存储上传

<fileStorageUploadField id="fileRefField"
                        acceptedFileTypes=".txt, .csv"
                        fileStoragePutMode="MANUAL"
                        fileNameVisible="true"/>

@Column(name = "PICTURE", length = 1024)
private FileRef picture;

<data>
    <instance id="documentDc" class="io.jmix.uisamples.entity.Document">
    </instance>
</data>
<layout>
    <fileStorageUploadField id="fileStorageUploadField" label="Select File"
                            dataContainer="documentDc" property="content"
                            fileNameVisible="false"
                            dropAllowed="true"
                            maxFileSize="51200"
                            fileStoragePutMode="MANUAL"
    />
</layout>

@ViewComponent
private FileStorageUploadField fileStorageUploadField;

@Autowired
private TemporaryStorage temporaryStorage;
@Autowired
private Notifications notifications;

// This handler is needed only when fileStoragePutMode="MANUAL".
// In AUTO mode the field automatically moves the uploaded file from temporary storage
// to the FileStorage and sets the returned FileRef to the entity attribute.
@Subscribe("fileStorageUploadField")
public void onFileStorageUploadFieldFileUploadSucceeded(
        final FileUploadSucceededEvent<FileStorageUploadField, TemporaryStorage.FileInfo> event) {
    UUID fileId = event.getData().getId();
    File file = temporaryStorage.getFile(fileId);

    if (file != null) {
        FileRef fileRef = new FileRef("tempStorage", file.getAbsolutePath(), file.getName());
        fileStorageUploadField.setValue(fileRef);
        notifications.create("Your file %s has been uploaded successfully.".formatted(event.getFileName()))
                .withThemeVariant(NotificationVariant.LUMO_PRIMARY)
                .show();

        // Remove the uploaded file.
        // In a real-world application you would move the file to FileStorage here using
        // the temporaryStorage.putFileIntoStorage() method.
        temporaryStorage.deleteFile(fileId);
    }
}