[开发工具]Java 调接口使用 RestTemplate 传输字节流文件

public Result uploadMaterial(String token) throws IOException {
        String url = String.format(Constant.UPLOAD_MATERIAL_URL_POST, douyinProperties.getAppId(), token);
        HttpHeaders httpHeaders = new HttpHeaders();
        httpHeaders.setContentType(MediaType.valueOf(MediaType.MULTIPART_FORM_DATA_VALUE));
        File file = new File("/home/user/Downloads/carl.jpg");
        byte[] bytes = new byte[(int) file.length()];
        FileInputStream fileInputStream = new FileInputStream(file);
        fileInputStream.read(bytes);
        fileInputStream.close();
        ByteArrayResource byteArrayResource = new ByteArrayResource(bytes) {
            @Override
            public String getFilename() {
                return "material_file";
            }
        };
        MultiValueMap<String, Object> multiValueMap = new LinkedMultiValueMap<>();
        multiValueMap.add("material_type", 7);
        multiValueMap.add("material_file", byteArrayResource);
        HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<>(multiValueMap, httpHeaders);
        ResponseEntity<Result> responseEntity = restTemplate.exchange(url, HttpMethod.POST, httpEntity, Result.class);
        return responseEntity.getBody();
    }