private static void uploadWordDocument(byte[] fileContents, final String filename) {
    RestTemplate restTemplate = new RestTemplate();
    String fooResourceUrl = "http://localhost:8080/spring-rest/foos"; // Dummy URL.
    MultiValueMap<String, Object> map = new LinkedMultiValueMap<String, Object>();

    map.add("name", filename);
    map.add("filename", filename);

    // Here we 
    ByteArrayResource contentsAsResource = new ByteArrayResource(fileContents) {
        @Override
        public String getFilename() {
            return filename; // Filename has to be returned in order to be able to post.
        }
    };

    map.add("file", contentsAsResource);

    // Now you can send your file along.
    String result = restTemplate.postForObject(fooResourceUrl, map, String.class);

    // Proceed as normal with your results.
}