How to expose an resource like downloadable link in Spring boot

Actually I have a spring boot server with many files in resource folder (src/main/resources/public/myfilefolder/myfiles.apk). Well my requirement is to download a file with cordova file transfer library. My first idea was put the resource link directly in the component:

var fileTransfer = new FileTransfer();
var fileURL = "///storage/emulated/0/DCIM/myFile";
var uri = encodeURI("http://myserver/src/main/resources/public/myfilefolder/myfiles.apk");

fileTransfer.download(
uri,
fileURL,
function(entry) {
alert("download complete: " + entry.toURL());
},
function(error) {
alert("download error source " + error.source);
alert("download error target " + error.target);
alert("download error code" + error.code);
},
false,
{

/*
headers: {
"Authorization": "Basic dGVzdHVzZXJuYW1lOnRlc3RwYXNzd29yZA=="
}

*/
}


But obviously doesn´t work well, because the server think that it´s a controller route. Any ideas to expose this resource to be downloadable?

http://myserver/myfilefolder/myfiles.apk

1 Answer
1

You can expose a get request in springboot app where you can pass your file name and it will download the file as based on input, you can add restriction on download based on your application requirement.

@GetMapping("/downloadResource")
public ResponseEntity<ByteArrayResource> downloadResource(
@RequestParam(defaultValue = DEFAULT_FILE_NAME) String fileName) throws IOException {

MediaType mediaType = MediaTypeUtils.getMediaTypeForFileName(this.servletContext, fileName);
System.out.println("fileName: " + fileName);
System.out.println("mediaType: " + mediaType);

Path path = Paths.get(DIRECTORY + "/" + DEFAULT_FILE_NAME);
byte data = Files.readAllBytes(path);
ByteArrayResource resource = new ByteArrayResource(data);

return ResponseEntity.ok()
// Content-Disposition
.header(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=" + path.getFileName().toString())
// Content-Type
.contentType(mediaType) //
// Content-Lengh
.contentLength(data.length) //
.body(resource);
}


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