resteasy実装ファイルアップロード

@Path(value = "file")
public class UploadFileService {
	private final String UPLOADED_FILE_PATH = "d:\\resteasy\\";
	@POST
	@Path(value = "/upload")
	@Consumes("multipart/form-data")
	public Response uploadFile(MultipartFormDataInput input) {
		String fileName = "";
		Map<String, List<InputPart>> uploadForm = input.getFormDataMap();
		List<InputPart> inputParts = uploadForm.get("file_upload");
		for (InputPart inputPart : inputParts) {
		 try {
			MultivaluedMap<String, String> header = inputPart.getHeaders();
			fileName = getFileName(header);
			//convert the uploaded file to inputstream
			InputStream inputStream = inputPart.getBody(InputStream.class,null);
			byte [] bytes = IOUtils.toByteArray(inputStream);
			//constructs upload file path
			fileName = UPLOADED_FILE_PATH + fileName;
			writeFile(bytes,fileName);
		  } catch (IOException e) {
			e.printStackTrace();
		  }
		}
		return Response.status(200)
		    .entity("uploadFile is called, Uploaded file name : " + fileName).build();
	}
 
	private String getFileName(MultivaluedMap<String, String> header) {
		String[] contentDisposition = header.getFirst("Content-Disposition").split(";");
		for (String filename : contentDisposition) {
			if ((filename.trim().startsWith("filename"))) {
				String[] name = filename.split("=");
				String finalFileName = name[1].trim().replaceAll("\"", "");
				return finalFileName;
			}
		}
		return "unknown";
	}
 
	//save to somewhere
	private void writeFile(byte[] content, String filename) throws IOException {
		File file = new File(filename);
		if (!file.exists()) {
			file.createNewFile();
		}
		FileOutputStream fop = new FileOutputStream(file);
		fop.write(content);
		fop.flush();
		fop.close();
	}
}

<form action="http://localhost:8080/resteay-server/file/upload/"
		method="post" enctype="multipart/form-data">
		<input type="file" name="file_upload"> <input type="submit"
			value="  ">
</form>