from flask import Flask, render_templatefrom flask_uploads import UploadSet, IMAGES, configure_uploadsfrom flask_wtf import Formfrom wtforms import SubmitFieldfrom flask_wtf.file import FileField, FileAllowed, FileRequiredfrom flask_bootstrap import Bootstrapapp = Flask(__name__)# 新建一个set用于设置文件类型、过滤等set_mypic = UploadSet(‘mypic‘)  # mypic# 用于wtf.quick_form()模版渲染bootstrap = Bootstrap(app)# mypic 的存储位置,# UPLOADED_xxxxx_DEST, xxxxx部分就是定义的set的名称, mypi, 下同app.config[‘UPLOADED_MYPIC_DEST‘] = ‘./static/img‘# mypic 允许存储的类型, IMAGES为预设的 tuple(‘jpg jpe jpeg png gif svg bmp‘.split())app.config[‘UPLOADED_MYPIC_ALLOW‘] = IMAGES# 把刚刚app设置的config注册到set_mypicconfigure_uploads(app, set_mypic)app.config[‘SECRET_KEY‘] = ‘xxxxx‘# 此处WTF的SCRF密码默认为和flask的SECRET_KEY一样# app.config[‘WTF_CSRF_SECRET_KEY‘] = ‘wtf csrf secret key‘class UploadForm(Form):    ‘‘‘        一个简单的上传表单    ‘‘‘    # 文件field设置为‘必须的’，过滤规则设置为‘set_mypic’    upload = FileField(‘image‘, validators=[                       FileRequired(), FileAllowed(set_mypic, ‘you can upload images only!‘)])    submit = SubmitField(‘ok‘)@app.route(‘/‘, methods=(‘GET‘, ‘POST‘))def index():    form = UploadForm()    url = None    if form.validate_on_submit():        filename = form.upload.data.filename        url = set_mypic.save(form.upload.data, name=filename)    return render_template(‘index.html‘, form=form, url=url)if __name__ == ‘__main__‘:    app.run(debug=True)

1 {% import "bootstrap/wtf.html" as wtf %}2 3 {% block page_content %}4     <h4>uploaded: {% if url %} {{url}}{% endif %}</h4>5     {{ wtf.quick_form(form, enctype="multipart/form-data") }} 6 {% endblock page_content %}