In my project , there is a need to download file from external service and store it in some path. So I was using RestTemplate in spring to download file as Byte[] . But then this operation is costing me memory consumption. I found out in this blog https://inneka.com/programming/spring/spring-webclient-how-to-stream-large-byte-to-file/ about using spring webClient and writing file to path . Since my concerned file is audio file im using APPLICATION_OCTET_STREAM . The problem the below code is not working . Im very new to reactive programming, any hints for this would be helpful.
public Mono<void> testWebClientStreaming(String filename, String format) throws IOException {
WebClient webClient = WebClient.create("https://stackoverflow.com");
String username = "Username";
String token = "Password";
String path = DOWNLOAD_TEMP_PATH + PATH_SEPERATOR + filename +"."+ format;
Flux<DataBuffer> stream = webClient
.get()
.uri("/files/{filename}.{format}",
filename, format)
.accept(MediaType.APPLICATION_OCTET_STREAM)
.header("Authorization", "Basic " + Base64Utils.encodeToString((username + ":" + token).getBytes(UTF_8)))
.retrieve()
.bodyToFlux(DataBuffer.class);
return DataBufferUtils.write(stream, asynchronousFileChannel)
.doOnComplete(() -> System.out.println("\n\n\n\n\n\n FINISHED "))
.doOnNext(DataBufferUtils.releaseConsumer())
.doAfterTerminate(() -> {
try {
asynchronousFileChannel.close();
} catch (IOException ignored) { }
}).then();
}
I've tried exchange() , instead of retrive() which was working , but again I can't write the content in files .
Or is there any way to achieve the same using other ways ?
