Python Flask 上传文件测试示例

 Flask file upload代码

import os
from flask import Flask, request, redirect, url_for, send_from_directory
from werkzeug.utils import secure_filename
UPLOAD_FOLDER = '/tmp/flask-upload-test/'
ALLOWED_EXTENSIONS = set(['txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif'])
app = Flask(__name__)
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
def allowed_file(filename):
    return '.' in filename and \
           filename.rsplit('.', 1)[1] in ALLOWED_EXTENSIONS
@app.route('/', methods=['GET', 'POST'])
def upload_file():
    if request.method == 'POST':
        # check if the post request has the file part
        if 'file' not in request.files:
            print 'no file'
            return redirect(request.url)
        file = request.files['file']
        # if user does not select file, browser also
        # submit a empty part without filename
        if file.filename == '':
            print 'no filename'
            return redirect(request.url)
        if file and allowed_file(file.filename):
            filename = secure_filename(file.filename)
            file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
            return redirect(url_for('uploaded_file',
                                    filename=filename))
    return '''
    
    Upload new File
    

Upload new File

''' @app.route('/uploads/') def uploaded_file(filename): return send_from_directory(app.config['UPLOAD_FOLDER'], filename) if __name__ == "__main__": app.run(debug=True)

上传测试

$ curl -F 'file=@"foo.png";filename="bar.png"' 127.0.0.1:5000

注意:使用上传文件功能的时候使用 POST form-data,参数名就是参数名(一般会提前约定好,而不是变化的文件名),参数的值是一个文件(这个文件正常是有文件名的)。

上传临时文件

有时候脚本生成了要上传的文件,但并没有留在本地的需求,所以使用临时文件的方式,生成成功了就直接上传。

使用 tempfile

tempfile 会在系统的临时目录中创建文件,使用完了之后会自动删除。

import requests
import tempfile
url = 'http://127.0.0.1:5000'
temp = tempfile.NamedTemporaryFile(mode='w+', suffix='.txt')
try:
    temp.write('Hello Temp!')
    temp.seek(0)
    files = {'file': temp}
    r = requests.post(url, files=files, proxies=proxies)
finally:
    # Automatically cleans up the file
    temp.close()

使用 StringIO

或者直接使用 StringIO,可以直接在内存中完成整个过程。

import requests
from StringIO import StringIO
url = 'http://127.0.0.1:5000'
temp = StringIO()
temp.write('Hello Temp!')
temp.seek(0)
temp.name = 'hello-temp.txt'    # StringIO 的实例没有文件名,需要自己手动设置,不设置 POST 过去那边的文件名会是 'file'
files = {'file': temp}
r = requests.post(url, files=files)

其他

补上发现的一段可以上传多个同名附件的代码:

files = [
    ("attachments", (display_filename_1, open(filename1, 'rb'),'application/octet-stream')),
    ("attachments", (display_filename_2, open(filename2, 'rb'),'application/octet-stream'))
]
r = requests.post(url, files=files, data=params)

参考

10.6. tempfile — Generate temporary files and directories — Python 2.7.12 documentation

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