Java download file using a byte[] [duplicate]

Question

I have web-service method which returns a byte[], so I did this to force the download of the returned file

 final byte[] content = axisService.getWebFileContent(pieceJointe.getVlidnlfy()); if (content != null) { final Map<String, Object> lrFile = new HashMap<>(2); lrFile.put("CONTENT", content); lrFile.put("MIMETYPE", "application/octet-stream"); response.reset(); response.resetBuffer(); response.setContentType("application/force-download"); response.setHeader("Content-Transfer-Encoding", "binary"); response.setHeader("Content-Disposition", "attachment; filename=\"" + pieceJointe.getLbnompcj() + "\"");// fileName); response.getOutputStream().write((byte[]) lrFile.get("CONTENT")); response.setContentLength(((byte[]) lrFile.get("CONTENT")).length); response.getOutputStream().close(); response.flushBuffer(); }

but it doesn't work and I don't see any error on my console. Do I need to add an additional configuration to my response object ?

but it doesn't work and i dont have any error in my console — What's the error and how is the code supposed to work? Could you please edit your question and add more information? — deHaar
– deHaar, Commented Dec 9, 2019 at 14:17
Hello , this code is used to force the donwload of the file into my browser but nothing happens after the execution of this code — Adnen Sadfi
– Adnen Sadfi, Commented Dec 9, 2019 at 14:20
To exclude the most common beginner's mistake: are you using ajax to hit the "web service"? — BalusC
– BalusC, Commented Dec 9, 2019 at 15:51
OK, there's nothing wrong with your servlet. The problem is because you're using ajax instead of a simple window.location=servletUrl. Next time unit-test your servlet (without ajax). You should have noticed that your code actually worked just fine. See the abovelinked dupe for some solutions/alternatives. — BalusC
– BalusC, Commented Dec 10, 2019 at 11:10

g kexxt · Accepted Answer · 2019-12-09 15:05:33Z

you are setting your content Length after writing the output.

 response.getOutputStream().write((byte[]) lrFile.get("CONTENT")); response.setContentLength(((byte[]) lrFile.get("CONTENT")).length);

to

 response.setContentLength((long) lrFile.get("CONTENT").length); response.getOutputStream().write((byte[]) lrFile.get("CONTENT"));

Joop Eggen · Accepted Answer · 2019-12-09 15:32:55Z

As you do not filename*= in the content disposiition, the file name should not contain special characters.

You still should not have written to the output (neither getOutputSteam() or getOutputWriter()).

 response.setContentType("application/force-download"); response.setContentLength(content.length); //response.setHeader("Content-Transfer-Encoding", "binary"); String filename = URLEncoder.encode(pieceJointe.getLbnompcj(), "UTF-8"); response.setHeader("Content-Disposition", "attachment; filename=\"" + filename + "\""); response.getOutputStream().write(content); response.getOutputStream().close();

At the moment I cannot test the code for content disposition. So read at the reference. It could be something like:

 response.setHeader("Content-Disposition", "attachment; filename*=UTF-8\'\'" + filename);

reset should not be done, resetBuffer is more a hack should something alredy have been written but still reside in the buffer.

i resolved the problem by creating a form and using the submit action to execute the request

Amlesh Kumar · Accepted Answer · 2019-12-09 15:39:30Z

This might be useful for you s3Client getObject as byte[] fileContent.

byte[] fileContent = s3Client.getObject(imagesBucketName, documentsFolderName, metadata.getFileName()); resource = new InputStreamResource(new ByteArrayInputStream(fileContent)); FileResponse fileResponse = new FileResponse(); fileResponse.setInputStreamResource(resource); fileResponse.setMimeType(metadata.getContentType()); fileResponse.setFileSize(metadata.getFileSize()); @GetMapping("/logo/{spaceId}") public ResponseEntity<InputStreamResource> getCompanyLogo(@PathVariable("spaceId") Integer spaceId) throws FileDownloadException, InvalidInputException { FileResponse fileResponse = companySpaceService.downloadCompanyLogo(); return ResponseEntity.ok().contentLength(fileResponse.getFileSize()) .contentType(MediaType.parseMediaType(fileResponse.getMimeType())) .body(fileResponse.getInputStreamResource()); }

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Java download file using a byte[] [duplicate]

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