如何在wicket中的请求结束时避免FileUploadField重置

public class MyForm extends Form<Void> {
    private FileUploadField fileUploadField;

    public MyForm(String id) {
        super(id);
        fileUploadField = new FileUploadField("fileUploadField");
        add(fileUploadField);
    }

    public void onSubmit() {
        List<FileUpload> fileUploads = fileUploadField.getFileUploads();
        // 处理文件上传
        // ...

        // 将文件列表保存到会话中
        getSession().setAttribute("fileUploads", fileUploads);
    }

    @Override
    protected void onInitialize() {
        super.onInitialize();

        // 从会话中检索文件列表
        List<FileUpload> fileUploads = (List<FileUpload>) getSession().getAttribute("fileUploads");
        if (fileUploads != null) {
            // 将文件列表设置回FileUploadField
            fileUploadField.setFileUploads(fileUploads);
        }
    }
}