写入CSV文件，然后在Appengine（Java）中将其压缩 [英] Writing to CSV Files and then Zipping it up in Appengine (Java)

问题描述

我目前正在开发一个在google appengine上用Java完成的项目。

I'm currently working on a project that is done in Java, on google appengine.

Appengine不允许存储文件，因此任何磁盘表示对象不能使用。其中一些包括File类。

Appengine does not allow files to be stored so any on-disk representation objects cannot be used. Some of these include the File class.

我想写数据并将其导出到几个csv文件，然后将其压缩并允许用户下载。

I want to write data and export it to a few csv files, and then zip it up, and allow the user to download it.

我如何在不使用任何文件类的情况下这样做？我不是很有经验的文件处理，所以我希望你们可以告诉我。

How may I do this without using any File classes? I'm not very experienced in file handling so I hope you guys can advise me.

谢谢。

推荐答案

如果你的数据不是巨大的，意思可以留在内存，然后导出到CSV和拉链和流下载它们都可以在他们飞。缓存可以在任何这些步骤完成，这在很大程度上取决于您的应用程序的业务逻辑。

If your data is not huge, meaning can stay in memory then exporting to CSV and zipping up and streaming it for downloading can all be done on-they-fly. Caching can be done at any of these steps which greatly depends on your application's business logic.

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