# 81 使用flask\_wtf1验证上传的文件 1.定义表单的时候，对文件的字段，需要采用"FileField"这个类型 2.验证器应该从"flask\_wtf.file"中导入，使用“flask\_wtf.file.FileRequired”是用来验证文件上传是否为空，“flask\_wtf.file.FileAllowed”用来验证上传的文件的后缀名 3.在视图文件中，使用"from werkzeug.datastructures.CombinedMultiDict"，来把"request.form"与"request.files"来进行合并，再传给表单来做验证 ```text form = UploadFrom(CombinedMultiDict([request.form,request.files])) ``` ```text upload.py @app.route("/upload/",methods=["GET","POST"]) def upload(): if request.method == "GET": return render_template("upload.html") else: form = UploadFrom(CombinedMultiDict([request.form,request.files])) if form.validate(): # 通过form.字段名.data来获取数据 desc = form.desc.data avatar = form.avatar.data filename = secure_filename(avatar.filename) avatar.save(os.path.join(UPLOAD_PATH,filename)) print(os.path.join("\\".join(UPLOAD_PATH.split('/')),filename)) return "文件上传成功" else: print(form.errors) return "fail" ``` ```text forms.py from wtforms import Form,FileField,StringField from wtforms.validators import InputRequired # flask_wtf from flask_wtf.file import FileAllowed,FileRequired class UploadFrom(Form): # 使用Flask - WTF提供的FileRequired、FileAllowed验证函数 avatar = FileField(validators=[FileRequired(),FileAllowed(['jpg','png','gif'])]) desc = StringField(validators=[InputRequired()]) ```