对文件上传使用表单验证

from wtforms import Form,FileField,StringField
from wtforms.validators import InputRequired
from flask_wtf.file import FileRequired,FileAllowed


class Upload(Form):
    avatar = FileField(validators=[FileRequired(),
                                   FileAllowed(['jpg','png','gif'])])#FileRequired文件必须要上传，
    # FileAllowed文件允许上传的格式

    desc = StringField(validators=[InputRequired()])#文件描述一定要填写
Form类的代码

from flask import Flask,request,render_template
#验证文件安全
from werkzeug.utils import secure_filename
#获取服务器的图片
from flask import send_from_directory
#可以把两个不可变的字典组成一个字典
from werkzeug.datastructures import CombinedMultiDict
from forms_file import Upload

import os

app = Flask(__name__)

UPLOAD_PATH = os.path.join(os.path.dirname(__file__),'image')


@app.route('/')
def hello_world():
    return 'hello world'


#上传文件api
@app.route('/upload/',methods=['GET',"POST"])
def upload():
    if request.method == "GET":
        return render_template('upload.html')
    else:
        #request.form类型是不可变的字典,通过CombinedMultiDict，就可以把文件
        # 上传的数据都传递给Upload这个类了
        upload_file = Upload(CombinedMultiDict([request.form,request.files]))
　　　　　if upload_file.validata():
　　　　　　　　desc = upload_file.desc.data
　　　　　　　　avatar = upload_file.avatar.data
　
        # desc = request.form.get('desc')
        # avater = request.files.get('avater')
        # import uuid
        # filename_split = avater.filename.split('.')
        # filename_uuid = '{0}{1}{2}'.format(uuid.uuid1(),".",filename_split[1])
        # filename = secure_filename(filename_uuid)
        # avater.save(os.path.join(UPLOAD_PATH,filename))
        # print(desc)
        # return '上传成功'

#获取图片api
@app.route('/image/<uuid:filename>')
def get_image(filename):
    return send_from_directory(UPLOAD_PATH,filename)

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