java - java程序无法在system中创建文件夹。为什么？

我正在研究项目，并在其中创建一个程序来在系统中创建文件夹。当我运行程序时，它显示：


java.io.FileNotFoundException：文件'E：\ Program
Files \ IBM \ SDP \ Profin \ EmailAttachment \ 30189 \ 31609 \ T0000021811.pdf'确实
不存在


我的代码是：

    public EmailQueueAttachment[] get(Long emailQueueId)throws InvalidDAOArgumentException {
    if (emailQueueId == null) {
        throw new InvalidDAOArgumentException("Email Queue Id  can not be null.");
    }
    EmailQueueAttachmentListHelper criteria = new EmailQueueAttachmentListHelper();
    criteria.setEmailQueueId(emailQueueId);
    List<Model> emailQueueAttachmentList = getList(criteria, -1, -1).getCurrentPageData();
    if (emailQueueAttachmentList != null) {
        EmailQueueAttachment[] attachments = (EmailQueueAttachment[]) emailQueueAttachmentList.toArray(new EmailQueueAttachment[emailQueueAttachmentList.size()]);
        for(int i=0; i<attachments.length; i++){
            try {
                attachments[i].setAttachmentContent(FileUtils.readFileToByteArray(new File(SystemUtil.getEmailAttachmentFolderName() +  File.separator + emailQueueId + File.separator + attachments[i].getRecNo() + File.separator + attachments[i].getAttachmentName())));
            } catch (IOException e) {
                e.printStackTrace();
                throw new DAOException(e);
            }
        }
        return attachments;
    }
    return null;
}

最佳答案

您需要确保父文件夹存在于您要创建文件的位置

您可以在尝试写入文件之前使用File(parent).mkdirs()