Flask 上传下载文件

上传文件示例代码

#encoding:utf8
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' # 用于保存上传文件的文件夹名称
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']) # 允许上传的文件格式

# 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('/',methods=['GET'],strict_slashes=False)
def indexpage():
    return render_template('index.html')

# 上传文件
@app.route('/',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['file']  # 从表单的file字段获取文件，file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)
        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
        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, "msg":"succeed ","token":token})
    else:
        return jsonify({"errno":1001, "errmsg":u"failed"})

if __name__ == '__main__':
    app.run(debug=True, port=9990)

下载

send_file('供下载的文件名', as_attachment=True, attachment_filename="下载给用户的文件名")