How to mkdirs on gwt when fileupload on client

Question

i mode development in eclipse. the fileupload works just fine. but i will make directory to /var/wms/year/month/file.jpg on linux. this my source code from client: add component to form

fileUpload = new SingleUploader(FileInputType.LABEL);
    fileUpload.setFileInputPrefix("PJ");
    fileUpload.addOnFinishUploadHandler(onFinishUploaderHandler);
    layoutContainerItemRight.add(fileUpload, formData);

method is addOnFinishUploadHandler

private IUploader.OnFinishUploaderHandler onFinishUploaderHandler = new IUploader.OnFinishUploaderHandler() {
    public void onFinish(IUploader uploader) {
        if (uploader.getStatus() == gwtupload.client.IUploadStatus.Status.SUBMITING) {
            String month = VisionProperties.getBulan();
            String year = DateTimeFormat.getFormat( "d-M-yyyy" ).format( new Date() ).split( "-")[2];
            String strDirectoy = "/var/wms/" + year + "/" + month + "/";
            File file = new File(strDirectoy);
            if (!file.exists()) {
                file.mkdirs();
            }
        }

        if (uploader.getStatus() == gwtupload.client.IUploadStatus.Status.SUCCESS) {
        String msg  = uploader.getServerInfo().message;
        fileName    = msg.toString();
            if(selectWindow != 2){
                img.setUrl("servlet.gupld?show=&fieldname=" + fileName);
                itemPanel.render(img.getElement());
            }else{
                tb.setVisible(true);
                tb.setText("Download File "+uploader.getFileName());
            }
        }
    }
};

how to make directory file when upload file process?

Answer 1

You cannot do this on client side. You can perform this on server side in the following ways

1. before you upload the files to server by another rpc/http call.
2. after you upload the files to server when the file upload servlet is being executed on the srever side.

HTML5 FILE API are restricted to readonly behavior in even modern browser.

Reference - 1. Basic File upload in GWT 2. How to retrieve file from GWT FileUpload component?

Answer 2

You are trying to use to use java.io.File in the client side which is not supported by the set of packages in the GWT jre emulation.

If you want to do this in client side you have to use the javascript File Api which is not supported by old browsers, and is not implemented in gwt-core. Using elemental you could use the Api only with Chrome, but I'm not positive. So it is better to wrap it via jsni, it is planned in gwtupload, but there is no a timeframe yet. Be aware that using js File Api, you dont have access to your real filesystem, but a virtual one inside your browser. To save created files in the local filesystem you have to download it using and iframe so as it asks the user where to save it.

Otherwise, If you wanted to do this work at server side, do it overriding the executeAction in your servlet if you are extending UploadAction.