python flask 多文件上传 下载

import os # We'll render HTML templates and access data sent by POST # using the request object from flask. Redirect and url_for # will be used to redirect the user once the upload is done # and send_from_directory will help us to send/show on the # browser the file that the user just uploaded from flask import Flask, render_template, request, redirect, url_for, send_from_directory from werkzeug import secure_filename # Initialize the Flask application app = Flask(__name__) # This is the path to the upload directory app.config['UPLOAD_FOLDER'] = 'uploads/' # These are the extension that we are accepting to be uploaded app.config['ALLOWED_EXTENSIONS'] = set(['txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif']) # For a given file, return whether it's an allowed type or not def allowed_file(filename): return '.' in filename and \
           filename.rsplit('.', 1)[1] in app.config['ALLOWED_EXTENSIONS'] # This route will show a form to perform an AJAX request # jQuery is loaded to execute the request and update the # value of the operation @app.route('/') def index(): return render_template('index.html') # Route that will process the file upload @app.route('/upload', methods=['POST']) def upload(): # Get the name of the uploaded files  uploaded_files = request.files.getlist("file[]")
    filenames = [] for file in uploaded_files: # Check if the file is one of the allowed types/extensions  if file and allowed_file(file.filename): # Make the filename safe, remove unsupported chars  filename = secure_filename(file.filename) # Move the file form the temporal folder to the upload  # folder we setup  file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename)) # Save the filename into a list, we'll use it later  filenames.append(filename) # Redirect the user to the uploaded_file route, which  # will basicaly show on the browser the uploaded file  # Load an html page with a link to each uploaded file  return render_template('upload.html', filenames=filenames) # This route is expecting a parameter containing the name # of a file. Then it will locate that file on the upload # directory and show it on the browser, so if the user uploads # an image, that image is going to be show after the upload @app.route('/uploads/') def uploaded_file(filename): return send_from_directory(app.config['UPLOAD_FOLDER'],  filename) if __name__ == '__main__':
    app.run( host="127.0.0.1",  port=int("5000"),  debug=True  )

index.html

html> lang="en">    href="bootstrap/3.0.0/css/bootstrap.min.css"  rel="stylesheet">      
class="container">  
class="header">  
class="text-muted">How To Upload a File.
  
  
  
  
action="upload" method="post" enctype="multipart/form-data">  type="file" multiple="" name="file[]" class="span3" />
  type="submit" value="Upload" class="span2">    
  
  
 

upload.html

html> lang="en">    href="bootstrap/3.0.0/css/bootstrap.min.css"  rel="stylesheet">      
class="container">  
class="header">  
class="text-muted">Uploaded files
  
  
  
  This is a list of the files you just uploaded, click on them to load/download them 
  {% for file in filenames %} 
href="{{url_for('uploaded_file', filename=file)}}">{{file}}
  {% endfor %} 
  
  
class="header">  
class="text-muted">Code to manage a Upload
  
  
 
 @app.route('/upload', methods=['POST'])
def upload():
  # Get the name of the uploaded file
  #file = request.files['file']
  uploaded_files = request.files.getlist("file[]")
  filenames = []
  for file in uploaded_files:
    # Check if the file is one of the allowed types/extensions
    if file and allowed_file(file.filename):
      # Make the filename safe, remove unsupported chars
      filename = secure_filename(file.filename)
      # Move the file form the temporal folder to the upload
      # folder we setup
      file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
      filenames.append(filename)
      # Redirect the user to the uploaded_file route, which
      # will basicaly show on the browser the uploaded file
  # Load an html page with a link to each uploaded file
  return render_template('upload.html', filenames=filenames)