Extended sample code (demonstrating file modification and deletion for the registered WatchKey in this section's example) is included in the sample code download.
示例代码下载中包含扩展的示例代码(展示了在这部分的例子中，为注册的WatchKey进行的文件修改与删除)。
With the solution, the dynamic download, refreshment and deletion in Multi-application card system can be accomplished safely.
通过此方案的实施，安全地实现了“一卡多用”系统中应用的动态下载、更新和删除。
The main system functions file upload and download, online document editing, deletion of documents, user management, and other functions.
系统实现的主要功能有：文件的上传与下载，在线文件编辑，文件删除，用户管理等功能。
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