java - 如何将pdf/byte[]消息阅读器添加到exchangeStrategies，不支持内容类型 'application/pdf'

Question

我无法使用 webClient (webflux) 有效使用 pdf Rest Web 服务

这是我的 webClient 创建:

ExchangeStrategies pdfExchangeStrategy = ExchangeStrategies
                        .builder()
                        .codecs(
                                        clientCodecConfigurer -> {
                                            CustomCodecs customCodecs = clientCodecConfigurer.customCodecs();
                                            final ByteArrayDecoder byteArrayDecoder = new ByteArrayDecoder(){

                                                @Override
                                                public List<MimeType> getDecodableMimeTypes() {
                                                    return Collections.singletonList(APPLICATION_PDF);
                                                }
                                            };
                                            customCodecs.decoder(byteArrayDecoder);
                                            customCodecs.encoder(new ByteArrayEncoder());
                                            DecoderHttpMessageReader pdfReader = new DecoderHttpMessageReader(byteArrayDecoder);
                                            customCodecs.reader(pdfReader);
                                        }
                        )
                        .build();
        this.webClient = webClientFactory
                        .newBuilder(logger, "My web client")
                        .exchangeStrategies(pdfExchangeStrategy)
                        .defaultHeader(ACCEPT, APPLICATION_PDF_VALUE)
                        .defaultHeader(CONTENT_TYPE, APPLICATION_PDF_VALUE)
                        .baseUrl(this.baseUrl)
                        .build();

这是我的电话:

webClient.get()
                 .uri("http://localhost:8084/my-app/document/{id}", id)
                 .accept(APPLICATION_PDF)
                 .retrieve()
                 .bodyToMono(Byte[].class)
                 .block();

我收到此错误:

org.springframework.web.reactive.function.UnsupportedMediaTypeException: Content type 'application/pdf' not supported

即使在supportedMediaTypes中，我有application/pdf

使用的网络服务是:

@GetMapping(value = "/document/{id}", produces = APPLICATION_PDF_VALUE)
    public ResponseEntity<byte[]> getDocument(@PathVariable String id) throws IOException {
        LOGGER.info("get  document with id =  {}", id);
        byte[] pdf = getInvoicePdf("document/sample.pdf");
        HttpHeaders headers = new HttpHeaders();
        headers.setContentDispositionFormData("filename",  id + ".pdf");
        headers.setContentType(APPLICATION_PDF);
        headers.setContentLength(pdf.length);
        return ResponseEntity
                        .ok()
                        .headers(headers)
                        .body(pdf);
    }

感谢您的帮助

Answer 1

最终不需要所有样板交换策略，解决这个问题所需的只是:

        webClient.get()
                 .uri("http://localhost:8084/my-app/document/{id}", id)
                 .accept(APPLICATION_PDF)
                 .exchange()
                 .block()
                 .bodyToMono(byte[].class)
                 .block()