import io.netty.handler.codec.http.multipart.DiskFileUpload; //导入依赖的package包/类
private String finishUpload() throws Exception {
    String pathTo = null;
    try {
        while (decoder.hasNext()) {
            InterfaceHttpData data = decoder.next();
            if (data != null) {
                if (data instanceof DiskFileUpload) {
                    DiskFileUpload diskFileUpload = (DiskFileUpload) data;
                    Path tmpFile = diskFileUpload.getFile().toPath();
                    String uploadedFilename = diskFileUpload.getFilename();
                    String extension = "";
                    if (uploadedFilename.contains(".")) {
                        extension = uploadedFilename.substring(uploadedFilename.lastIndexOf("."),
                                uploadedFilename.length());
                    }
                    String finalName = tmpFile.getFileName().toString() + extension;

                    //this is just to make it work on team city.
                    Path staticPath = Paths.get(staticFolderPath, uploadFolder);
                    if (!Files.exists(staticPath)) {
                        Files.createDirectories(staticPath);
                    }

                    Files.move(tmpFile, Paths.get(staticFolderPath, uploadFolder, finalName),
                            StandardCopyOption.REPLACE_EXISTING);
                    pathTo =  uploadFolder + finalName;
                }
                data.release();
            }
        }
    } catch (EndOfDataDecoderException endOfData) {
        //ignore. that's fine.
    } finally {
        // destroy the decoder to release all resources
        decoder.destroy();
        decoder = null;
    }

    return pathTo;
}