如何使用Flask wtf表单通过电子邮件发送附件？

使用Flask wtf表单通过电子邮件发送附件可以通过以下步骤实现：

导入所需的模块和类：

from flask import Flask, render_template, request
from flask_wtf import FlaskForm
from wtforms import SubmitField
from flask_wtf.file import FileField, FileRequired
from flask_mail import Mail, Message

创建Flask应用和配置邮件参数：

app = Flask(__name__)
app.config['SECRET_KEY'] = 'your_secret_key'
app.config['MAIL_SERVER'] = 'your_mail_server'
app.config['MAIL_PORT'] = 587
app.config['MAIL_USE_TLS'] = True
app.config['MAIL_USERNAME'] = 'your_username'
app.config['MAIL_PASSWORD'] = 'your_password'

初始化邮件扩展：

mail = Mail(app)

创建表单类并定义文件字段和提交按钮：

class MyForm(FlaskForm):
    file = FileField('Attachment', validators=[FileRequired()])
    submit = SubmitField('Send')

创建路由处理函数，处理表单提交和邮件发送：

@app.route('/', methods=['GET', 'POST'])
def index():
    form = MyForm()
    if form.validate_on_submit():
        file = form.file.data
        filename = secure_filename(file.filename)
        file.save(os.path.join(app.root_path, 'uploads', filename))
        
        msg = Message('Attachment', sender='your_email', recipients=['recipient_email'])
        msg.attach(filename, 'application/octet-stream', file.read())
        mail.send(msg)
        
        return 'Email sent successfully!'
    return render_template('index.html', form=form)

创建HTML模板文件（index.html）来渲染表单：

<!DOCTYPE html>
<html>
<head>
    <title>Flask WTF Form</title>
</head>
<body>
    <h1>Send Attachment</h1>
    <form method="POST" enctype="multipart/form-data">
        {{ form.csrf_token }}
        {{ form.file.label }} {{ form.file }}
        {{ form.submit }}
    </form>
</body>
</html>

以上代码实现了一个简单的Flask应用，通过wtf表单上传文件并通过电子邮件发送附件。在使用时，需要替换相应的配置参数和邮件信息。

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