使用flask实现简单的文件上传

from flask import Flask, redirect, render_template, request, url_for
from werkzeug.utils import secure_filename
import os
app = Flask(__name__)
ALLOWED_EXTENSIONS = set(['txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif', 'doc'])

# 设置允许上传的文件的类型

def allowed_file(filename):
    """
    上传的文件类型
    :param filename: 传入的文件名
    :return: 返回True 或者 False
    """
    return "." in filename and filename.rsplit(".", 1)[1] in ALLOWED_EXTENSIONS

@app.route("/", methods=["GET", "POST"])
def file_name():
    """
    上传文件
    :return: 返回上传文件的url地址
    """
    if request.method == "POST":
        f = request.files["file"]
        if f and allowed_file(f.filename):
            path = os.path.split(os.getcwd())[0]
            print(path)
            file = path+"/demo/templates/"+secure_filename(f.filename)
            print(file)
            f.save(file)
            return redirect("/uploads")
        else:
            return redirect(url_for("fail"))
    return render_template("file_name.html")

@app.route("/uploads")
def successful():
    """
    设置返回路径的视图函数
    :return:
    """
    url = url_for("file_name")
    return '访问文件的路径：http://127.0.0.1:5000{}'.format(url)

@app.route("/fail")
def fail():
    """
    文件类型不符合的视图函数
    :return:
    """
    return "文件不符合规则"

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