#!/usr/bin/env python
# -*- coding: utf-8 -*-
from flask import Blueprint, render_template
from flask_uploads import UploadSet, IMAGES
from flask_wtf import FlaskForm
from flask_wtf.file import FileRequired, FileField, FileAllowed
from wtforms import SubmitField
bp = Blueprint('upload3', __name__, url_prefix='/upload3')
photos = UploadSet('photos', IMAGES)
class UploadFileForm(FlaskForm):
photo = FileField(validators=[
# 显示文件上传类型
FileAllowed(photos, '只能上传图片'),
# 必须上传文件
FileRequired('没有选择文件')
])
submit = SubmitField('上传')
# 需要设置methods，前面忘记写了报错
@bp.route('/', methods=['GET', 'POST'])
def index():
# 不能传入request.form参数
form = UploadFileForm()
if form.validate_on_submit():
# 从from对象中保存文件
filename = photos.save(form.photo.data)
# 还是返回了文件的url路径，而不是文件路径
file_url = photos.url(filename)
else:
file_url = None
return render_template('update3/index.html', form=form, file_url=file_url)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>UploadFile3</title>
</head>
<body>
<form method="POST" enctype="multipart/form-data" action="{{ url_for('upload3.index') }}">
{{ form.hidden_tag() }}
{{ form.photo }}
<input type="submit" value="提交">
{% for error in form.photo.errors %}
<span style="color:red;">{{ error }}</span>
{% endfor %}
</form>
{% if file_url %}
<br/>
<img src="{{ file_url }}">
{% endif %}
</body>
</html>
因为用到了flask_uploads，所以还是需要加上两个函数
configure_uploads(_app, photos)
patch_request_class(_app)
如果用上form表单的话，需要加上SECRET_KEY
这个是随便写的，但正常情况下，肯定会生成随机的字符串。
SECRET_KEY = 'abcdefg'
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