JIN MAO 's Blog

@PostMapping(value = "/file/{fileName}")
public ResponseEntity<FileSystemResource> getFile(@PathVariable("fileName") String fileName) throws FileNotFoundException {
	File file = new File(filePath, fileName);
	if (file.exists()) {
		return export(file);
	}
	System.out.println(file);
	return null;
}
 
public ResponseEntity<FileSystemResource> export(File file) {
	if (file == null) {
		return null;
	}
	HttpHeaders headers = new HttpHeaders();
	headers.add("Cache-Control", "no-cache, no-store, must-revalidate");
	headers.add("Content-Disposition", "attachment; filename=" + file.getName());
	headers.add("Pragma", "no-cache");
	headers.add("Expires", "0");
	headers.add("Last-Modified", new Date().toString());
	headers.add("ETag", String.valueOf(System.currentTimeMillis()));
	return ResponseEntity.ok()
                        .headers(headers)
                        .contentLength(file.length())
                        .contentType(MediaType.parseMediaType("application/octet-stream"))
                        .body(new FileSystemResource(file));
}