最近在做下载html页面的时候,用了rubyzip包,它的说明文档里有这样一段可以直接拿来用的
require'zip'# This is a simple example which uses rubyzip to# recursively generate a zip file from the contents of# a specified directory. The directory itself is not# included in the archive, rather just its contents.#
# Usage:# directory_to_zip = "/tmp/input"# output_file = "/tmp/out.zip"# zf = ZipFileGenerator.new(directory_to_zip, output_file)# zf.write()class ZipFileGenerator
# Initialize with the directory to zip and the location of the output archive.def initialize(input_dir, output_file)
@input_dir = input_dir
@output_file = output_file
end
# Zip the input directory.def write
entries = Dir.entries(@input_dir) - %w(. ..)
::Zip::File.open(@output_file, ::Zip::File::CREATE) do |zipfile| write_entries entries, '', zipfile
end
end
private
# A helper method to make the recursion work.def write_entries(entries, path, zipfile)
entries.each do |e| zipfile_path = path =='' ? e : File.join(path, e)
disk_file_path = File.join(@input_dir, zipfile_path)
puts "Deflating #{disk_file_path}"if File.directory? disk_file_path
recursively_deflate_directory(disk_file_path, zipfile, zipfile_path)
else put_into_archive(disk_file_path, zipfile, zipfile_path)
end
end
end
def recursively_deflate_directory(disk_file_path, zipfile, zipfile_path)
zipfile.mkdir zipfile_path
subdir = Dir.entries(disk_file_path) - %w(. ..)
write_entries subdir, zipfile_path, zipfile
end
def put_into_archive(disk_file_path, zipfile, zipfile_path)
zipfile.get_output_stream(zipfile_path) do |f| f.write(File.open(disk_file_path, 'rb').read)
end
end
end
于是按照说明直接使用,我的代码如下:
report_path ="path/folder"# 某个path下的folderoutput_file = Rails.root.join(download_path,"report.zip")
File.delete(output_file) if File.exists?(output_file)
zf = ZipFileGenerator.new(report_path, output_file)
zf.write()
这时出现了Errno::EACCES (Permission denied @ rb_sysopen的错误。
它的意思应该是没有权限打开文件。
按照这个思路分析,去排查权限的问题,但权限都是正常的,没有什么问题。
再去看说明文档,发现了其中的原由,文档里有这么一段:
# Usage:# directory_to_zip = "/tmp/input"# output_file = "/tmp/out.zip"# zf = ZipFileGenerator.new(directory_to_zip, output_file)# zf.write()
这说明directory_to_zip和output_file都是string对象。
而我传入的Rails.root.join(download_path,"report.zip"),是一个Pathname对象,这导致了错误的出现。
我们平常在rails里较为常用的Rails.root.join和File.join的区别就是返回的对象不同,并且Rails.root使用时也可以像字符一样,以致我都认为它就是返回的字符串,所以才导致了这样的错误,以后还是要仔细些才行,不要再犯同样的错误,特此mark一下。