我正在学习Python,并使用Flask开发应用程序,其功能之一是用户可以上传个人资料图片,并且该图片应保存在数据库中。
我有一个用户可以在其中上传文件的表单,如下所示:
<form action="/myprofile" method="post" enctype="multipart/form-data">
<div class="form-group">
<input class="form-control" name="picture" placeholder="Picture" type="file">
</div>
<button class="btn btn-primary" type="submit">Submit</button>
</form>
然后,在application.py文件中,我像这样处理它:
@app.route("/myprofile", methods=["GET", "POST"])
@login_required
def myprofile():
if request.method == "POST":
db.execute("UPDATE users SET role = :role, picture = :picture, linkedin = :linkedin WHERE id = :user_id", role = request.form.get("role"), picture = request.files("picture"), linkedin = request.form.get("linkedin"), user_id = session["user_id"])
return render_template("home.html")
else:
return render_template("myprofile.html")
这将返回内部服务器错误。有谁知道为什么吗?
感谢您的时间!
答案 0 :(得分:0)
我看不到您遇到什么错误,但是我想分享我以前关于将图片上传到Flask的答案之一。 我使用flask,flask_sqlalchemy(带有sqlite3),html和Bootstrap准备了一个迷你应用程序,该应用程序可以满足您的要求。
您可以在此处找到完整的代码(我将通过更安全的文件上传对其进行更新),因为此处给出的只是一小部分:
在FileContent(db.Model)类中:
data = file.read()将二进制文件版本保存在数据库中 -render_file = render_picture(数据)。它保存了解码版本,因此您可以在网页中看到它以进行渲染。
NumberFormatException
这就是应用程序路线中正在发生的事情:
def render_picture(data)->获取照片的原始版本并返回解码版本,以便可以将其显示在Web上。
data = file.read():这是原始数据。可用于从数据库下载图片
render_file:已解码的文件,因此您可以在网页中检索它和渲染
#渲染图片,此函数将数据转换为 request.files ['inputFile'],以便可以显示其中
<xsl:variable name="$country" select="Request/country"/>
<xsl:variable name="countries">|EG|KSA|UAE|AG|</xsl:variable>
<xsl:when test="contains($countries,concat('|',$country,'|')">
your logic goes here....
</xsl:when>
# Built-in Imports
import os
from datetime import datetime
from base64 import b64encode
import base64
from io import BytesIO #Converts data from Database into bytes
# Flask
from flask import Flask, render_template, request, flash, redirect, url_for, send_file # Converst bytes into a file for downloads
# FLask SQLAlchemy, Database
from flask_sqlalchemy import SQLAlchemy
basedir = 'sqlite:///' + os.path.join(os.path.abspath(os.path.dirname(__file__)), 'data.sqlite')
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = basedir
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
app.config['SECRET_KEY'] = 'dev'
db = SQLAlchemy(app)
# Picture table. By default the table name is filecontent
class FileContent(db.Model):
"""
The first time the app runs you need to create the table. In Python
terminal import db, Then run db.create_all()
"""
""" ___tablename__ = 'yourchoice' """ # You can override the default table name
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(128), nullable=False)
data = db.Column(db.LargeBinary, nullable=False) #Actual data, needed for Download
rendered_data = db.Column(db.Text, nullable=False)#Data to render the pic in browser
text = db.Column(db.Text)
location = db.Column(db.String(64))
pic_date = db.Column(db.DateTime, nullable=False, default=datetime.utcnow)
def __repr__(self):
return f'Pic Name: {self.name} Data: {self.data} text: {self.text} created on: {self.pic_date} location: {self.location}'
def render_picture(data):
render_pic = base64.b64encode(data).decode('ascii')
return render_pic
@app.route('/upload', methods=['POST'])
def upload():
file = request.files['inputFile']
data = file.read()
render_file = render_picture(data)
text = request.form['text']
location = request.form['location']
newFile = FileContent(name=file.filename, data=data,
rendered_data=render_file, text=text, location=location)
db.session.add(newFile)
db.session.commit()
flash(f'Pic {newFile.name} uploaded Text: {newFile.text} Location:
{newFile.location}')
return render_template('upload.html')