Example usage for org.springframework.util MimeTypeUtils generateMultipartBoundaryString

Introduction

In this page you can find the example usage for org.springframework.util MimeTypeUtils generateMultipartBoundaryString.

Prototype

public static String generateMultipartBoundaryString() 

Source Link

Document

Generate a random MIME boundary as String, often used in multipart mime types.

Usage

From source file:org.springframework.http.codec.ResourceHttpMessageWriter.java

@Override
@SuppressWarnings("unchecked")
public Mono<Void> write(Publisher<? extends Resource> inputStream, @Nullable ResolvableType actualType,
        ResolvableType elementType, @Nullable MediaType mediaType, ServerHttpRequest request,
        ServerHttpResponse response, Map<String, Object> hints) {

    HttpHeaders headers = response.getHeaders();
    headers.set(HttpHeaders.ACCEPT_RANGES, "bytes");

    List<HttpRange> ranges;
    try {/*  www  .j a v  a 2s.  c  o  m*/
        ranges = request.getHeaders().getRange();
    } catch (IllegalArgumentException ex) {
        response.setStatusCode(HttpStatus.REQUESTED_RANGE_NOT_SATISFIABLE);
        return response.setComplete();
    }

    return Mono.from(inputStream).flatMap(resource -> {

        if (ranges.isEmpty()) {
            return writeResource(resource, elementType, mediaType, response, hints);
        }

        response.setStatusCode(HttpStatus.PARTIAL_CONTENT);
        List<ResourceRegion> regions = HttpRange.toResourceRegions(ranges, resource);
        MediaType resourceMediaType = getResourceMediaType(mediaType, resource, hints);

        if (regions.size() == 1) {
            ResourceRegion region = regions.get(0);
            headers.setContentType(resourceMediaType);
            long contentLength = lengthOf(resource);
            if (contentLength != -1) {
                long start = region.getPosition();
                long end = start + region.getCount() - 1;
                end = Math.min(end, contentLength - 1);
                headers.add("Content-Range", "bytes " + start + '-' + end + '/' + contentLength);
                headers.setContentLength(end - start + 1);
            }
            return writeSingleRegion(region, response, hints);
        } else {
            String boundary = MimeTypeUtils.generateMultipartBoundaryString();
            MediaType multipartType = MediaType.parseMediaType("multipart/byteranges;boundary=" + boundary);
            headers.setContentType(multipartType);
            Map<String, Object> allHints = Hints.merge(hints, ResourceRegionEncoder.BOUNDARY_STRING_HINT,
                    boundary);
            return encodeAndWriteRegions(Flux.fromIterable(regions), resourceMediaType, response, allHints);
        }
    });
}

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