I have the following endpoint code to serve PDF files.
JavaScript
x
@RequestMapping
ResponseEntity<byte[]> getPDF() {
File file = ;
byte[] contents = null;
try {
try (FileInputStream fis = new FileInputStream(file)) {
contents = new byte[(int) file.length()];
fis.read(contents);
}
} catch(Exception e) {
// error handling
}
HttpHeaders headers = new HttpHeaders();
headers.setContentDispositionFormData(file.getName(), file.getName());
headeres.setCacheControl("must-revalidate, post-check=0, pre-check=0");
return new ResponseEntity<>(contents, headers, HttpStatus.OK);
}
How can I convert above into a reactive type Flux/Mono
and DataBuffer
.
I have check DataBufferUtils
but It doesn’t seem to offer what I needed. I didn’t find any example either.
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Answer
The easiest way to achieve that would be with a Resource
.
JavaScript
@GetMapping(path = "/pdf", produces = "application/pdf")
ResponseEntity<Resource> getPDF() {
Resource pdfFile = ;
HttpHeaders headers = new HttpHeaders();
headers.setContentDispositionFormData(file.getName(), file.getName());
return ResponseEntity
.ok().cacheControl(CacheControl.noCache())
.headers(headers).body(resource);
}
Note that DataBufferUtils
has some useful methods there that convert an InputStream
to a Flux<DataBuffer>
, like DataBufferUtils#read()
. But dealing with a Resource
is still superior.