Base64解码并在Python中写入文件，通过cgi.Fieldstorage发送Base64-String

时间：2013-12-21 16:22:57

标签： python file-upload base64 image-uploading

我想将图像文件保存到服务器文件夹。 我通过cgi.Fieldstorage重新获取图像。地址和Base64字符串如下所示：

http://localhost/upload.py?data={"base64" : "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"}

据我所知，Python使用RFC 3548或RFC 4648的标准'Base64'编码，因此String应该没问题。

我试试这段代码：

def getParam():
     import json
     import cgi
     form3 = cgi.FieldStorage()
     form2 = form3["data"].value
     form1 =json.loads(form2)
     return(form1) 

a = getParam()
import base64
print(a["base64"])
imgdata = base64.b64decode(a["base64"])
print("----------------------------------------------")
print(imgdata)
filename = '/var/www/images/some_image.jpg'
t = open(filename, "wb")
t.write(base64.b64decode(a["base64"]))
t.close()
print(filename)

如果我执行的响应是

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 Tl5ufo6erx8vP09fb3 Pn6/8QAHwEAAwEBAQEBAQEBAQAAAAAAAAECAwQFBgcICQoL/8QAtREAAgECBAQDBAcFBAQAAQJ3AAECAxEEBSExBhJBUQdhcRMiMoEIFEKRobHBCSMzUvAVYnLRChYkNOEl8RcYGRomJygpKjU2Nzg5OkNERUZHSElKU1RVVldYWVpjZGVmZ2hpanN0dXZ3eHl6goOEhYaHiImKkpOUlZaXmJmaoqOkpaanqKmqsrO0tba3uLm6wsPExcbHyMnK0tPU1dbX2Nna4uPk5ebn6Onq8vP09fb3 Pn6/9oADAMBAAIRAxEAPwD7 orj7Y6tqk19Kut3NpHHeTQpFFBCVVUcqOWQnt61S8TX154W0K91bUPEl/5FrGXKi3tsseyj931J4qZSUIuUnZIqMXJqK3Z3tFeJ3/xF1CDwTZ JtP1DVrwXGWa18m2V40U4dj 6PAyPzFdnoN1deJNItNU0vxRfS2t1GHQ/Z7bI9Qf3fBB4NYU8TRqy5ISu7J/J9TSdCpTjzSWl7fM7miuX/s3Vv hkvv8AwHtv/jdV9QttYsrG5uE8RXjtDEzhWt7fBIGcHEftXSYnYUVHbyGW3ikb7zoGP1IooA8Y134vaN4C1y20rVHw9/q9wszHgQxtIwEhPTAYDIOODntTPi5rPgvW7RdH8SeNrPQIbWdXuleQAMf4VYkgDkisjxX8FIviN4oOo6jevHpsF9dedAjEOxEjYC9gM47E9eeAK O9fvrWHWNbsfE8M012moNvjktyY0mi cQ7iNpbKk7T64xXzePxFem3TqU aEn57K19v1PZ4fwUsZVryrVFDltyapXbT730uuivqfROkePF8L Jp7uGWPVtFt/NhggSQNH5LbV3KRkNlI48duPevpjwvPpd1odpN4eihg0 Vd6RwqFVCeSMDgHJOfevzdvNJ11tHsbfw9eQ6Lc20iOCowuF/hIGQRnmvZvh5 0Fr3gbTY9P16Oz1iMSN5kxX7OxKqoZuPlHI6Ae/UmvJyzMqWHcvazum3ZWu0fT43h3HVkuWnZpLdpJ/ifalUNb/wCQNqH/AF7Sf gmvK/C37Sfg3xCkIu5J9LmkjWQLMmV2t0O4dvriu m8T6PrmiXzaRqdpeBreTAimDH7p7V9hSxeHr/AMOaf5/cfH4jL8Xhf41Npd7affsddZf8edv/ANcl/lRSWBzY23/XJP5Ciuo885ezum0qW/gu7O LNezyqYrOSVSruWUhlBHQ/hXkV/8AA7QL/wAet4jlu/ER02XVV1ifRW0p2t5LwAfPkpnaSoJXnPPrX0bRSaT3Gm1qjyu78F CL0kz EJMnqU0iZP/AEFRXG M/gb4G8T6M1np iXuk3QmWZLj yJ7hcjgq0bDDKQenHOD2r6GornWFw6lzKCv6I7Hj8XKDg6srPpd2/M8H0D4QfD/AEHS9PtJfDeoXk9raRW8lw n3QM2xcbioGBnk47Zrcbw14PsbaX x/Cs8N6sbeQ40ifcHwcYYrxXrlFCwuHi ZU1f0Q5Y/GSjySqya7cz/zK1jHJFY20ci4dIlVh7gCirNFdJwhRRRQAUUUUAFFFFABRRRQB/9k=
----------------------------------------------
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/var/www/images/some_image.jpg

问题是我无法打开以这种方式生成的文件（不支持的标记类型0x68）。为什么呢？

编辑：我刚认识到加载字符串后+被替换为

1 个答案:

答案 0 :(得分：2)

如果您通过地址栏移交数据，+会自动转换为空白区域。只需在Base64-String上使用string.replace（''，'+'）就可以了。

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