Filedownload & ZipOutputStream

asked 2018-10-16 15:24:52 +0800

IngoB
256 ● 6

Hi,

I want to offer a download of multiple files, which are compressed. Since I have limited space on the hdd, I want to zip the files while downloading.
This seems to be possible, if you write to the response's output stream (Creating Zip file while client is downloading) / (Compress dynamic content to ServletOutputStream).

I tried to write directly to the outputstream, but it fails with: (illegal character (SyntaxError))

HttpServletResponse response = ((HttpServletResponse) Executions.getCurrent().getNativeResponse());
response.setContentType("application/zip");
response.setHeader("Content-Disposition", "attachment;filename=test.zip");
try (ZipOutputStream out = new ZipOutputStream(response.getOutputStream())) {
    byte[] readAllBytes = Files.readAllBytes(Paths.get("test.xlsx"));
    ZipEntry zipEntry = new ZipEntry("test.xlsx");
    zipEntry.setSize(readAllBytes.length);
    zipEntry.setTime(System.currentTimeMillis());
    out.putNextEntry(zipEntry);
    out.write(readAllBytes);
    out.closeEntry();
    // You may add other files here if you want to
    out.finish();
} catch (Exception e) {
    e.printStackTrace();
}

Another, probably better option would be to use the Filedownload, but the only stream is an Inputstream.

Does anyone got an idea how to solve this? Thank you :)