方法签名, byte[] content为接收到的文件流
public void getFile(byte[] content, String fileName, String fileId) {
String dir = Constant.TEMP_FILE_PATH + jsonStoreService.generatorStoreId() + "/";
FileUtil.mkdir(dir);
File docFile = new File(dir + fileName + ".doc");
FileUtil.writeBytes(content, docFile);
}