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package com.vaadin.tests.resources;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import com.vaadin.server.FileResource;
import com.vaadin.tests.components.TestBase;
import com.vaadin.ui.Button;
public class DownloadLargeFileResource extends TestBase {
private FileResource hugeFileResource = null;
private long fileSize = (long) (1233.2 * 1024.0 * 1024.0);
@Override
protected void setup() {
Button b = new Button("Download a "
+ String.format("%.1f", fileSize / 1024.0 / 1024.0) + "MB file",
event -> download());
addComponent(b);
}
protected void download() {
if (hugeFileResource == null) {
createFile();
}
getMainWindow().open(hugeFileResource);
}
private void createFile() {
try {
File hugeFile = File.createTempFile("huge", ".txt");
hugeFile.deleteOnExit();
BufferedOutputStream os = new BufferedOutputStream(
new FileOutputStream(hugeFile));
int writeAtOnce = 1024 * 1024;
byte[] b = new byte[writeAtOnce];
for (int i = 0; i < fileSize; i += writeAtOnce) {
os.write(b);
}
os.close();
hugeFileResource = new FileResource(hugeFile);
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
protected String getDescription() {
return "Click the button to download huge-file.txt. The file is generated on the first download.";
}
@Override
protected Integer getTicketNumber() {
return 5356;
}
}
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