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fix(demo): wire basic demo zip button to a real DownloadHandler #198

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javier-godoy merged 1 commit into from
May 22, 2026
Merged

fix(demo): wire basic demo zip button to a real DownloadHandler #198

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35 changes: 34 additions & 1 deletion src/test/java/com/flowingcode/vaadin/addons/gridexporter/GridExporterDemo.java
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Original file line number Diff line number Diff line change
Expand Up @@ -34,14 +34,19 @@
import com.vaadin.flow.data.provider.DataProvider;
import com.vaadin.flow.router.PageTitle;
import com.vaadin.flow.router.Route;
import com.vaadin.flow.server.streams.DownloadHandler;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.math.BigDecimal;
import java.nio.charset.StandardCharsets;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.List;
import java.util.stream.IntStream;
import java.util.stream.Stream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import org.apache.poi.EncryptedDocumentException;

@DemoSource
Expand Down Expand Up @@ -98,9 +103,37 @@ public GridExporterDemo() throws EncryptedDocumentException, IOException {
shareSelect.setItems("Whatsapp", "Facebook", "X (Twitter)");
shareSelect.setWidth("120px");

DownloadHandler zipHandler = event -> {
String base = exporter.getFileName();
event.setFileName(base + ".zip");
event.setContentType("application/zip");
try (ZipOutputStream zos = new ZipOutputStream(event.getOutputStream())) {
// Inner writers may close their wrapper streams; shield the ZipOutputStream from that
// while still flushing any pending writes.
OutputStream nonClosing = new FilterOutputStream(zos) {
@Override
public void close() throws IOException {
flush();
}
};
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zos.putNextEntry(new ZipEntry(base + ".xlsx"));
new ExcelStreamResourceWriter<>(exporter, null).accept(nonClosing, event.getSession());
zos.closeEntry();
zos.putNextEntry(new ZipEntry(base + ".docx"));
new DocxStreamResourceWriter<>(exporter, null).accept(nonClosing, event.getSession());
zos.closeEntry();
zos.putNextEntry(new ZipEntry(base + ".pdf"));
new PdfStreamResourceWriter<>(exporter, null).accept(nonClosing, event.getSession());
zos.closeEntry();
zos.putNextEntry(new ZipEntry(base + ".csv"));
new CsvStreamResourceWriter<>(exporter).accept(nonClosing, event.getSession());
zos.closeEntry();
}
};

Anchor zipLink = new Anchor("", FontAwesome.Regular.FILE_ZIPPER.create());
zipLink.setHref(zipHandler);
zipLink.setTitle("Download zip file");
zipLink.getElement().setAttribute("download", true);

exporter.setFooterToolbarItems(
List.of(new FooterToolbarItem(zipLink, FooterToolbarItemPosition.EXPORT_BUTTON),
Expand Down
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