一、Python-Flask-文件上傳

1、簡化版文件上傳

創(chuàng)建目錄：

cd 5-4

mkdir -p uploads #必須先創(chuàng)建uploads文件夾。

upload.html

Title

文件上傳示例

app.py

import os

from flask import Flask, render_template, send_from_directory, request, jsonify, make_response

import time

app = Flask(__name__)

UPLOAD_FOLDER = 'upload'

app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER # 設(shè)置文件上傳的目標(biāo)文件夾

basedir = os.path.abspath(os.path.dirname(__file__)) # 獲取當(dāng)前項目的絕對路徑

ALLOWED_EXTENSIONS = set(['txt', 'png', 'jpg', 'xls', 'JPG', 'PNG', 'xlsx', 'gif', 'GIF']) # 允許上傳的文件后綴

# 判斷文件是否合法

def allowed_file(filename):

return '.' in filename and filename.rsplit('.', 1)[1] in ALLOWED_EXTENSIONS

# 具有上傳功能的頁面

@app.route('/')

def upload_test():

return render_template('upload.html')

@app.route('/api/upload', methods=['POST'], strict_slashes=False)

def api_upload():

file_dir = os.path.join(basedir, app.config['UPLOAD_FOLDER']) # 拼接成合法文件夾地址

if not os.path.exists(file_dir):

os.makedirs(file_dir) # 文件夾不存在就創(chuàng)建

f = request.files['myfile'] # 從表單的file字段獲取文件，myfile為該表單的name值

if f and allowed_file(f.filename): # 判斷是否是允許上傳的文件類型

fname = f.filename

ext = fname.rsplit('.', 1)[1] # 獲取文件后綴

unix_time = int(time.time())

new_filename = str(unix_time) + '.' + ext # 修改文件名

f.save(os.path.join(file_dir, new_filename)) # 保存文件到upload目錄

return jsonify({"errno": 0, "errmsg": "上傳成功"})

else:

return jsonify({"errno": 1001, "errmsg": "上傳失敗"})

# file download

@app.route("/download/")

def downloader(filename):

dirpath = os.path.join(app.root_path, 'upload') # 這里是下在目錄，從工程的根目錄寫起，比如你要下載static/js里面的js文件，這里就要寫“static/js”

# return send_from_directory(dirpath, filename, as_attachment=False) # as_attachment=True 一定要寫，不然會變成打開，而不是下載

return send_from_directory(dirpath, filename, as_attachment=True) # as_attachment=True 下載

# show photo

@app.route('/show/', methods=['GET'])

def show_photo(filename):

file_dir = os.path.join(basedir, app.config['UPLOAD_FOLDER'])

if request.method == 'GET':

if filename is None:

pass

else:

image_data = open(os.path.join(file_dir, '%s' % filename), "rb").read()

response = make_response(image_data)

response.headers['Content-Type'] = 'image/png'

return response

else:

pass

if __name__ == '__main__':

app.run(debug=True)

訪問網(wǎng)站：

2、優(yōu)化版文件上傳

2.1. 自動創(chuàng)建upload文件夾。

upload.html

Title

上傳文件

提交

app.py

import os

from flask import Flask, render_template, send_from_directory, request, jsonify

import time

app = Flask(__name__)

UPLOAD_FOLDER = 'upload'

app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER # 設(shè)置文件上傳的目標(biāo)文件夾

basedir = os.path.abspath(os.path.dirname(__file__)) # 獲取當(dāng)前項目的絕對路徑

ALLOWED_EXTENSIONS = set(['txt', 'png', 'jpg', 'xls', 'JPG', 'PNG', 'xlsx', 'gif', 'GIF']) # 允許上傳的文件后綴

# 判斷文件是否合法

def allowed_file(filename):

return '.' in filename and filename.rsplit('.', 1)[1] in ALLOWED_EXTENSIONS

# 具有上傳功能的頁面

@app.route('/')

def upload_test():

return render_template('upload.html')

@app.route('/api/upload', methods=['POST'], strict_slashes=False)

def api_upload():

file_dir = os.path.join(basedir, app.config['UPLOAD_FOLDER']) # 拼接成合法文件夾地址

if not os.path.exists(file_dir):

os.makedirs(file_dir) # 文件夾不存在就創(chuàng)建

f = request.files['myfile'] # 從表單的file字段獲取文件，myfile為該表單的name值

if f and allowed_file(f.filename): # 判斷是否是允許上傳的文件類型

fname = f.filename

ext = fname.rsplit('.', 1)[1] # 獲取文件后綴

unix_time = int(time.time())

new_filename = str(unix_time) + '.' + ext # 修改文件名

f.save(os.path.join(file_dir, new_filename)) # 保存文件到upload目錄

return jsonify({"errno": 0, "errmsg": "上傳成功"})

else:

return jsonify({"errno": 1001, "errmsg": "上傳失敗"})

# file download

@app.route("/download/")

def downloader(filename):

dirpath = os.path.join(app.root_path, 'upload') # 這里是下在目錄，從工程的根目錄寫起，比如你要下載static/js里面的js文件，這里就要寫“static/js”

# return send_from_directory(dirpath, filename, as_attachment=False) # as_attachment=True 一定要寫，不然會變成打開，而不是下載

return send_from_directory(dirpath, filename, as_attachment=True) # as_attachment=True 下載

if __name__ == '__main__':

app.run(debug=True)訪

1.2.訪問網(wǎng)址

上傳成功，返回值

下載文件

http://127.0.0.1:5000/download/1597310075.png

查看圖片

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