I am trying to download a file from a Spring boot rest service.
@RequestMapping(path="/downloadFile",method=RequestMethod.GET)
@Consumes(MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<InputStreamReader> downloadDocument(
String acquistionId,
String fileType,
Integer expressVfId) throws IOException {
File file2Upload = new File("C:\\Users\\admin\\Desktop\\bkp\\1.rtf");
HttpHeaders headers = new HttpHeaders();
headers.add("Cache-Control", "no-cache, no-store, must-revalidate");
headers.add("Pragma", "no-cache");
headers.add("Expires", "0");
InputStreamReader i = new InputStreamReader(new FileInputStream(file2Upload));
System.out.println("The length of the file is : "+file2Upload.length());
return ResponseEntity.ok().headers(headers).contentLength(file2Upload.length())
.contentType(MediaType.parseMediaType("application/octet-stream"))
.body(i);
}
When I tried to download the file from the browser, it starts the download, but always fails. Is there anything wrong with the service which is causing the download to fail?
Option 1 using an InputStreamResource
Resource implementation for a given InputStream.
Should only be used if no other specific Resource implementation is > applicable. In particular, prefer ByteArrayResource or any of the file-based Resource implementations where possible.
@RequestMapping(path = "/download", method = RequestMethod.GET)
public ResponseEntity<Resource> download(String param) throws IOException {
// ...
InputStreamResource resource = new InputStreamResource(new FileInputStream(file));
return ResponseEntity.ok()
.headers(headers)
.contentLength(file.length())
.contentType(MediaType.APPLICATION_OCTET_STREAM)
.body(resource);
}
Option2 as the documentation of the InputStreamResource suggests - using a ByteArrayResource:
@RequestMapping(path = "/download", method = RequestMethod.GET)
public ResponseEntity<Resource> download(String param) throws IOException {
// ...
Path path = Paths.get(file.getAbsolutePath());
ByteArrayResource resource = new ByteArrayResource(Files.readAllBytes(path));
return ResponseEntity.ok()
.headers(headers)
.contentLength(file.length())
.contentType(MediaType.APPLICATION_OCTET_STREAM)
.body(resource);
}