I tried using it but it gave me a blank page without exceptions after adding follow code: addExtension(downloader);
Any tips?
May I see the code?
I have multiple files to download on the same page, so, this code of FileDownloader works for single file, we can download and set it to the fileDownloader, and that can be easily downloaded…
But, if I have multiple files shown in a table, with each row having the file name, version and a download button.
I shouldn’t download all of them while coming to that page, this will affect the performance, like if there are more than 20 files, I will be downloading them and showing up the downloader button to the user. So, I need to have a onclick button, which will get the file right at that moment,
So, can anyone suggest on this?
Did you try SimpleFileDownloader component? https://vaadin.com/directory#!addon/simplefiledownloader
Not actually, we already have number of addons in the App, so I am trying out with the FileDownloader itself
Hi Nikolay I tried SimpleFileDownload with a simple test code, but when I click on button nothing happens.
final SimpleFileDownloader downloader = new SimpleFileDownloader();
addExtension(downloader);
Button button = new Button("Click Me");
button.addClickListener(new Button.ClickListener() {
public void buttonClick(ClickEvent event) {
final StreamResource resource = new StreamResource(new StreamSource() {
@Override
public InputStream getStream() {
return new ByteArrayInputStream("This is test clicked on button".getBytes());
}
}, "testButton.txt");
downloader.setFileDownloadResource(resource);
downloader.download();
}
});
myLayout.addComponent(button);Hi Piero!
Could you please provide more information about your test?
And what browser are you using for testing?
Thank you!
Mac OSX 10.10.5
Java 1.8.0_112-b16
Eclipse Neon.2 release 4.6.2
Apache Tomcat 8.0.39
Vaadin plugin 3.0.0
Browsers used: Firefox 50.1.0 and Safari 10.0.2
And are you adding extension to UI or some component? Vaadin version is 7?
Vaadin 7.7.6
I’m not adding extension. I’m testing this code in a window of my application.
ok, could you please provide source code of this window?
I’ve resolved. The problem was Ivy, after ivy caches clean now works.
But I’ve another question: using Page.getCurrent().open(resource, filename, true) the browser let the user to select action: save or open (the file is a pdf), but with SimpleFileDownloader there is only save option.
Can I use SimpleFileDownloader in that way?
Unfortunatully you can’t. But I will try to add such feature in the future 
Ok thanks!
Hi,
I am supper newbe to this framework and been given a task to work on few tasks out of which downlaoding the table content by selecting a variouse format via Combobox like xls, csv, geojson which is json text file, .dat file. I tried to use CSVExporter(tablecontent); and get the object to dawnload. but I wasnt able to ;(. any idea or similar work would be greatly appreciated. here is my code snippit,
private CSVExporter exporter;
ComboBox exportcombo = new ComboBox();
exportcombo.addItems(“Export”,“AWIPS II”,“CSV”,“Email Addresses”,“ESRI Shapefile”,“GeoJSON”,
“Gibson Rigde Placefile”,“KML”,“Mailing Lables”);
exportcombo.addValueChangeListener(new ValueChangeListener() {
public void valueChange(ValueChangeEvent event) {
exportType = (String) exportcombo.getValue();
exportcombo.setValue("Export");
if (exportType.equals("CSV")) {
exporter = new CSVExporter(contactTable);
exporter.getData();
} else if(exportType.equals("GeoJSON")){
//
}
}
it’s passable to generate a new file and download it when button click event happend
here
1)if i add click Listener it generate a file but not able to download it
2) if i extend that button it not generate a file
i try this but it not download a file
public class TestvaadinUI extends UI {
@WebServlet(value = "/*", asyncSupported = true)
@VaadinServletConfiguration(productionMode = false, ui = TestvaadinUI.class)
public static class Servlet extends VaadinServlet {
}
@Override
protected void init(VaadinRequest request) {
final VerticalLayout layout = new VerticalLayout();
layout.setMargin(true);
setContent(layout);
SimpleFileDownloader downloader = new SimpleFileDownloader();
addExtension(downloader);
StreamResource resource=getPDFStream(new File("/home/likewise-open/KONNECTBI/kirubakaran.m/Downloads/ARGEN-711.doc"));
downloader.setFileDownloadResource(resource);
Button button = new Button("Click Me");
button.addClickListener(new Button.ClickListener()
{
public void buttonClick(ClickEvent event)
{
downloader.download();
}
});
layout.addComponent(button);
}
private StreamResource getPDFStream(File inputfile) {
StreamResource.StreamSource source = new StreamResource.StreamSource() {
public InputStream getStream() {
InputStream input=null;
try
{
input = new FileInputStream(inputfile);
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
return input;
}
};
StreamResource resource = new StreamResource ( source, inputfile.getName());
return resource;
}
}
I tested your example on version 2.0.2 and it works fine. Probably something wrong with file (permissions or it’s not exist at the moment when you trying to download it).
that is greate can you please send me a example program
am using simple file downloader 2.0.2
here is it need to complie it’s widget?
am trying the below code to download my on fly excel file but nothing happen when click on button
plz check the code and correct me if anything wrong
SimpleFileDownloader downloader = new SimpleFileDownloader();
addExtension(downloader);
Button button = new Button("Click Me");
button.addClickListener(new Button.ClickListener()
{
public void buttonClick(ClickEvent event)
{
StreamResource resource=getStream(new File("/home/likewise-open/KONNECTBI/kirubakaran.m/Downloads/DL_TSTMDLLD.xlsx"));
downloader.setFileDownloadResource(resource);
downloader.download();
}
});
gl.addComponent(button, 4, 0);
}
private StreamResource getStream(File inputfile) {
StreamResource.StreamSource source = new StreamResource.StreamSource() {
public InputStream getStream() {
InputStream input=null;
try
{
input = new FileInputStream(inputfile);
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
return input;
}
};
StreamResource resource = new StreamResource ( source, inputfile.getName());
return resource;
}