如何在不使用 Ruby 保存到磁盘的情况下生成 zip 文件? [英] How can I generate zip file without saving to the disk with Ruby?

问题描述

我在内存中生成了许多 PDF 文件，我想在将它们作为电子邮件附件发送之前将它们压缩成一个 zip 文件.我看过 Rubyzip，它不允许我在不将其保存到磁盘的情况下创建 zip 文件(也许我错了).

I have generated many PDF files in memory and I want to compress them into one zip file before sending it as a email attachment. I have looked at Rubyzip and it does not allows me to create a zip file without saving it to disk (maybe I am wrong).

有什么办法可以在不创建临时文件的情况下压缩这些文件吗?

Is there any way I can compress those file without creating a temp file?

推荐答案

我有一个类似的问题，我使用 ruby​​zip gem 和 stringio 对象解决了这个问题.事实证明，rubyzip 提供了一个返回 stringio 对象的方法:ZipOutputStream.write_buffer.

I had a similar problem which I solved using the rubyzip gem and the stringio object. It turns out that rubyzip provides a method that returns a stringio object: ZipOutputStream.write_buffer.

您可以使用 put_next_entry 创建您喜欢的 zip 文件结构并写入，完成后您可以倒回 stringio 并使用 sysread 读取二进制数据.

You can create the zip file structure as you like using put_next_entry and write and once you are finished you can rewind the stringio and read the binary data using sysread.

参见下面的简单示例(适用于 ruby​​zip 0.9.X)

See the following simple example (works for rubyzip 0.9.X)

require 'zip/zip'
stringio = Zip::OutputStream.write_buffer do |zio|
  zio.put_next_entry("test.txt")
  zio.write "Hello world!"
end
stringio.rewind
binary_data = stringio.sysread

在 jruby 1.6.5.1 (ruby-1.9.2-p136) (2011-12-27 1bf37c2) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_29) [Windows Server 2008-amd64-java] 上测试)

Tested on jruby 1.6.5.1 (ruby-1.9.2-p136) (2011-12-27 1bf37c2) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_29) [Windows Server 2008-amd64-java])

以下示例适用于 ruby​​zip >= 1.0.0

The following example works for rubyzip >= 1.0.0

require 'rubygems'    
require 'zip'
stringio = Zip::OutputStream.write_buffer do |zio|
  zio.put_next_entry("test.txt")
  zio.write "Hello world!"
end
binary_data = stringio.string

在 jruby 1.7.22 (1.9.3p551) 2015-08-20 c28f492 上在 OpenJDK 64 位服务器 VM 1.7.0_79-b14 +jit [linux-amd64] 和 ruby​​zip gem 1.1.7 上测试

Tested on jruby 1.7.22 (1.9.3p551) 2015-08-20 c28f492 on OpenJDK 64-Bit Server VM 1.7.0_79-b14 +jit [linux-amd64] and rubyzip gem 1.1.7

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