是否可以使用App Engine生成并返回ZIP文件？

Question

我有一个小项目,非常适合Google App Engine.实现它取决于生成ZIP文件并将其返回的能力.

由于App Engine的分布式特性,据我所知,ZIP文件无法在传统意义上"内存"创建.它基本上必须生成并在单个请求/响应周期中发送.

Python zip模块是否甚至存在于App Engine环境中？

Answer 1

zipfile在appengine中可用,并且返回的示例如下:

from contextlib import closing
from zipfile import ZipFile, ZIP_DEFLATED

from google.appengine.ext import webapp
from google.appengine.api import urlfetch

def addResource(zfile, url, fname):
    # get the contents      
    contents = urlfetch.fetch(url).content
    # write the contents to the zip file
    zfile.writestr(fname, contents)

class OutZipfile(webapp.RequestHandler):
    def get(self):
        # Set up headers for browser to correctly recognize ZIP file
        self.response.headers['Content-Type'] ='application/zip'
        self.response.headers['Content-Disposition'] = \
            'attachment; filename="outfile.zip"'    

        # compress files and emit them directly to HTTP response stream
        with closing(ZipFile(self.response.out, "w", ZIP_DEFLATED)) as outfile:
            # repeat this for every URL that should be added to the zipfile
            addResource(outfile, 
                'https://www.google.com/intl/en/policies/privacy/', 
                'privacy.html')
            addResource(outfile, 
                'https://www.google.com/intl/en/policies/terms/', 
                'terms.html')

Answer 2

import zipfile
import StringIO

text = u"ABCDEFGHIJKLMNOPQRSTUVWXYVabcdefghijklmnopqqstuvweyxáéöüï? ? ? ? ? ? ? ?"

zipstream=StringIO.StringIO()
file = zipfile.ZipFile(file=zipstream,compression=zipfile.ZIP_DEFLATED,mode="w")
file.writestr("data.txt.zip",text.encode("utf-8"))
file.close()
zipstream.seek(0)
self.response.headers['Content-Type'] ='application/zip'
self.response.headers['Content-Disposition'] = 'attachment; filename="data.txt.zip"'
self.response.out.write(zipstream.getvalue())