java傳送HTTP協議檔案，最好使用OkHttpClient類來實現，我用了別人封裝的一些方法，上傳檔案有些檔案會出現上傳失敗！

OkHttpClient上傳檔案程式碼：

public static boolean uploadFile(String actionUrl,File file,String token) {
        OkHttpClient client = new OkHttpClient().newBuilder()
                .build();
        MediaType mediaType = MediaType.parse("multipart/form-data");
        RequestBody body = RequestBody.create(mediaType, file);
        Request request = new Request.Builder()
                .url(actionUrl)
                .method("POST", body)
                .addHeader("Authorization", token)
                .addHeader("Accept", "application/json;odata=verbose")
                .addHeader("Content-Type", "multipart/form-data")
                .build();
        try {
            Response response = client.newCall(request).execute();
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }