FLASK实现上传下载功能

#!-*-coding=utf-8-*-
# from flask import Flask
#
# app = Flask(__name__)
#
#
# @app.route('/')
# def hello_world():
#     return 'Hello World!'
#
#
# if __name__ == '__main__':
#     app.run()

from werkzeug.utils import secure_filename
from flask import Flask,render_template,jsonify,request,send_from_directory
import time
import os
import base64

app = Flask(__name__)
UPLOAD_FOLDER='upload'
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
basedir = os.path.abspath(os.path.dirname(__file__))
ALLOWED_EXTENSIONS = set(['txt','png','jpg','xls','JPG','PNG','xlsx','gif','GIF'])

# 用于判断文件后缀
def allowed_file(filename):
    return '.' in filename and filename.rsplit('.',1)[1] in ALLOWED_EXTENSIONS

# 用于测试上传，稍后用到
@app.route('/test/from')
def upload_test():
    return render_template('from.html')

# 上传文件
@app.route('/api/upload',methods=['POST'],strict_slashes=False)
def api_upload():
    file_dir = os.path.join(basedir, app.config['UPLOAD_FOLDER'])
    if not os.path.exists(file_dir):
        os.makedirs(file_dir)
    f = request.files['myfile']  # 从表单的file字段获取文件，myfile为该表单的name值

    if f and allowed_file(f.filename):  # 判断是否是允许上传的文件类型
        fname = secure_filename(f.filename)
        print fname
        ext = fname.rsplit('.',1)[1]  # 获取文件后缀
        unix_time = int(time.time())
        # new_filename = str(unix_time)+'.'+ext  # 修改了上传的文件名
        new_filename = '12'+'.'+ext  # 修改了上传的文件名
        f.save(os.path.join(file_dir,new_filename))  #保存文件到upload目录
        token = base64.b64encode(new_filename)
        print token

        return jsonify({"errno":0, "errmsg":"上传成功","token":token})
    else:
        return jsonify({"errno":1001, "errmsg":"上传失败"})

@app.route('/api/load',methods=['GET'])

def load():
    if request.method == "GET":
        if os.path.isfile(os.path.join('upload', '12.jpg')):
            return send_from_directory('upload', '12.jpg', as_attachment=True)

        # abort(404)



if __name__ == '__main__':
    app.run(debug=True, port=9999)

官网：http://docs.jinkan.org/docs/flask/patterns/fileuploads.html