blocks|key|1419588|text|导入"os"并运行以下行：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1419589|os.Remove(filename)|code-block|syntax|javascript|1419590|api+:我看到这种情况发生的唯一方式是使用ajax库从下载文件，然后在完成时调用不同的。普通的ajax调用在这里是行不通的，因为不是所有的浏览器都允许ajax直接访问磁盘，所以实现这一点的唯一方法就是使用像下面这样的http://johnculviner.com/jquery-file-download-plugin-for-ajax-like-feature-rich-file-downloads/库。|BOLD|1419591|库api可以通过以下方式利用成功和失败回调：|1419592|$.fileDownload('/url/to/download.pdf',+{
++++successCallback:+function+(url)+{

++++++++//do+another+ajax+call+to+delete+the+file...
++++},
++++failCallback:+function+(html,+url)+{
++++++++//handle+failure...
++++}
});+|1419593|entityMap|0|LINK|mutability|MUTABLE|url|http://johnculviner.com/jquery-file-download-plugin-for-ajax-like-feature-rich-file-downloads/^0|2|4|0|0|S|G|31|2M|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@$9|14|A|15|B|M]]|D|@$9|16|A|17|1|18]]|E|$]]|$1|N|3|O|5|6|7|19|8|@]|D|@]|E|$]]|$1|P|3|Q|5|H|7|1A|8|@]|D|@]|E|$I|J]]|$1|R|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|S|$T|$5|U|V|W|E|$X|Y]]]]

Import <code>"os"</code> and run the following line:

<pre><code>os.Remove(filename)
</code></pre>

Edit: The only way I could see this happening is by using an ajax library to download the files from an api then call a different api on finish. Normal ajax calls wont work here as all browsers wont allow ajax to access the disk directly, so the only way to do this is by using a library like this one <a href="http://johnculviner.com/jquery-file-download-plugin-for-ajax-like-feature-rich-file-downloads/" rel="nofollow">http://johnculviner.com/jquery-file-download-plugin-for-ajax-like-feature-rich-file-downloads/</a>

The library api can leverage things like success and failure callbacks in the following way:

<pre><code>$.fileDownload('/url/to/download.pdf', {
 successCallback: function (url) {

 //do another ajax call to delete the file...
 },
 failCallback: function (html, url) {
 //handle failure...
 }
}); 
</code></pre>

blocks|key|1419308|text|您需要在请求处理程序中的某个位置执行defer+os.Remove(zf)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1419309|这仍然会将偶尔的zip文件留在磁盘上(例如，如果您的服务器崩溃、重新启动或以其他方式中断)，因此您需要定期运行cron作业或类似作业来删除旧文件。|1419310|如果能够一致地重新生成压缩文件(例如，这将要求底层数据不变或版本化)，则可以使用http.ServeContent动态生成压缩文件。如果有大量的查找，这将是非常低效的，但是您可以拒绝接受范围，然后恰好会有两个查找:一个到文件末尾，另一个回到开头(用来计算长度)。|1419311|另一种避免磁盘文件的简单方法是在内存中生成压缩文件，然后使用strings.Reader通过http.ServeContent为其提供服务。不过，使用此解决方案很难管理服务器中的内存使用情况。|1419312|entityMap^0|I|J|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|R|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|S|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|M|$]]

You need to <code>defer os.Remove(zf)</code> somewhere in your request handler. A user downloading a file is no different from any other request: you know you're done when the request handler has finished executing.

This will still leave the occasional zip file on disk (for example, if your server crashes, restarts, or is otherwise interrupted), so you'll need a cron job or similar to run periodically to remove old files.

It's possible to generate a zipfile on the fly, using http.ServeContent, if you can regenerate the zipfile consistently (which will require, for example, that your underlying data is either unchanging or versioned). You can do this by writing your own <code>Seek</code> on top of zip that always resets the zip stream and skips ahead n bytes. This would be horrendously inefficient if there was a lot of seeking, but you can refuse to accept ranges and then there'll be exactly two seeks: one to the end of the file and one back to the start (done to compute the length).

Another simple way to avoid disk files is to generate the zip file in memory, and then use a strings.Reader to serve it via http.ServeContent. It'll be hard to manage memory use in your server with this solution though.

blocks|key|1419652|text|就像@Paul+Hankin建议的那样，我只是在添加代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1419653|return+middleware.ResponderFunc(func(w+http.ResponseWriter,+r+runtime.Producer)+{
++++++++fn+:=+filepath.Base(filePath)
++++++++w.Header().Set("Content-Type",+"application/octet-stream")
++++++++w.Header().Set("Content-Disposition",+fmt.Sprintf("attachment;+filename=%25q",+fn))
++++++++io.Copy(w,+file)
++++++++defer+os.Remove(filePath)+//+Path+to+file+you've+downloaded.
++++++++file.Close()
++++})|code-block|syntax|javascript|1419654|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Like @Paul Hankin suggested , I am just adding code.

<pre><code>return middleware.ResponderFunc(func(w http.ResponseWriter, r runtime.Producer) {
 fn := filepath.Base(filePath)
 w.Header().Set("Content-Type", "application/octet-stream")
 w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%q", fn))
 io.Copy(w, file)
 defer os.Remove(filePath) // Path to file you've downloaded.
 file.Close()
 })
</code></pre>

I'm developing a website using <a href="http://beego.me/" rel="nofollow">beego</a>

I'm having a zip file generated to let user download from my website. However,I don't know when to delete the file. Is there a way for me to know if user have finished download the zip file, so I could delete it from disk?

Or, Can I generate zip file on-the-fly and past the *zip.File to net/http? 
I see <code>http.ServeFile()</code> accept a ReadSeeker, yet I think zip.File don't satisfy <code>ReadSeeker</code> interface according to the doc.

Is there a good way to do file delete on my situation?

Golang how to delete generated zip file after user finish download?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在使用开发一个网站我有一个压缩文件生成，让用户从我的网站下载。但是，我不知道什么时候删除文件。有没有办法让我知道用户是否下载完了zip文件，这样我就可以把它从磁盘上删除了？或者，我可以动态生成压缩文件并通过*zip.File转换为net/http吗？我看到http.ServeFile()接受ReadSeeker，但...

问Golang用户下载完成后如何删除生成的zip文件？
EN

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问Golang用户下载完成后如何删除生成的zip文件？EN