【python】flask搭建一个上传网站css+js+flask（1）

最新推荐文章于 2024-05-25 23:12:29 发布

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最新推荐文章于 2024-05-25 23:12:29 发布

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分类专栏：后端前端 python 数据库文章标签： flask

本文链接：https://blog.youkuaiyun.com/qinglingLS/article/details/94619081

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本文介绍了一个基于Flask框架的文件上传应用，包括图片缩略图生成、文件重命名和类型检查等功能。该应用使用Python和PIL库处理图片，并提供RESTful API进行文件上传、删除和获取。

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参考代码： https://github.com/blueimp/jQuery-File-Upload/

代码逻辑由app.py决定，具体功能见我加上的注释：
在这里插入图片描述
app.py

#!flask/bin/python

# Author: Ngo Duy Khanh
# Email: ngokhanhit@gmail.com
# Git repository: https://github.com/ngoduykhanh/flask-file-uploader
# This work based on jQuery-File-Upload which can be found at https://github.com/blueimp/jQuery-File-Upload/

import os
import PIL
from PIL import Image
import simplejson
import traceback

from flask import Flask, request, render_template, redirect, url_for, send_from_directory
from flask_bootstrap import Bootstrap
from werkzeug.utils import secure_filename

from lib.upload_file import uploadfile


app = Flask(__name__)   # 使用flask框架，绑定
app.config['SECRET_KEY'] = 'hard to guess string'  # 设置秘钥，路径，最大图片大小等等
app.config['UPLOAD_FOLDER'] = 'data/'
app.config['THUMBNAIL_FOLDER'] = 'data/thumbnail/'
app.config['MAX_CONTENT_LENGTH'] = 50 * 1024 * 1024

ALLOWED_EXTENSIONS = set(['txt', 'gif', 'png', 'jpg', 'jpeg', 'bmp', 'rar', 'zip', '7zip', 'doc', 'docx'])
IGNORED_FILES = set(['.gitignore'])

bootstrap = Bootstrap(app)

'''
检查类型
'''
def allowed_file(filename):
    return '.' in filename and \
        filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS  # 检查类型是否包含在列表里

'''
针对重名情况进行处理
'''
def gen_file_name(filename):
    """
    If file was exist already, rename it and return a new name
    """

    i = 1
    while os.path.exists(os.path.join(app.config['UPLOAD_FOLDER'], filename)):
        name, extension = os.path.splitext(filename)
        filename = '%s_%s%s' % (name, str(i), extension)
        i += 1

    return filename

'''
建立缩略图
'''
def create_thumbnail(image):
    try:
        base_width = 80 # 宽度基线
        img = Image.open(os.path.join(app.config['UPLOAD_FOLDER'], image)) # 载入图片
        w_percent = (base_width / float(img.size[0])) # 宽度和像素比
        h_size = int((float(img.size[1]) * float(w_percent))) # 等比缩放
        img = img.resize((base_width, h_size), PIL.Image.ANTIALIAS) # 修改图片大小
        img.save(os.path.join(app.config['THUMBNAIL_FOLDER'], image)) # 保存图片到本地

        return True

    except:
        print(traceback.format_exc()) # 异常处理，打印栈路径
        return False


# 访问路径修改为http://127.0.0.1:5000/upload 时调用upload
@app.route("/upload", methods=['GET', 'POST'])
def upload():
    if request.method == 'POST':
        files = request.files['file']

        if files:
            filename = secure_filename(files.filename)  # 防止黑客攻击，去除不安全的命名，安全命名
            filename = gen_file_name(filename)  # 生产新命名
            mime_type = files.content_type  #  保存媒体类型 图片：image/jpeg

            if not allowed_file(files.filename):
                result = uploadfile(name=filename, type=mime_type, size=0, not_allowed_msg="File type not allowed")

            else:
                # save file to disk
                uploaded_file_path = os.path.join(app.config['UPLOAD_FOLDER'], filename)  # 路径地址加上文件名称
                files.save(uploaded_file_path)  # 文件保存到上传路径

                # create thumbnail after saving
                if mime_type.startswith('image'):
                    create_thumbnail(filename)  # 图片类型，创建缩略图

                # get file size after saving
                size = os.path.getsize(uploaded_file_path)  # 保存后，读取本地文件获取文件大小

                # return json for js call back
                result = uploadfile(name=filename, type=mime_type, size=size)  # 上传文件
                print(uploadfile(name=filename, type=mime_type, size=size))

            return simplejson.dumps({"files": [result.get_file()]})

    if request.method == 'GET':
        print("get")
        # get all file in ./data directory
        files = [f for f in os.listdir(app.config['UPLOAD_FOLDER']) if os.path.isfile(os.path.join(app.config['UPLOAD_FOLDER'],f)) and f not in IGNORED_FILES ]

        file_display = []

        for f in files:
            size = os.path.getsize(os.path.join(app.config['UPLOAD_FOLDER'], f))
            file_saved = uploadfile(name=f, size=size)
            file_display.append(file_saved.get_file())

        return simplejson.dumps({"files": file_display})

    return redirect(url_for('index'))


@app.route("/delete/<string:filename>", methods=['DELETE'])
def delete(filename):
    file_path = os.path.join(app.config['UPLOAD_FOLDER'], filename)
    file_thumb_path = os.path.join(app.config['THUMBNAIL_FOLDER'], filename)

    if os.path.exists(file_path):
        try:
            os.remove(file_path)

            if os.path.exists(file_thumb_path):
                os.remove(file_thumb_path)

            return simplejson.dumps({filename: 'True'})
        except:
            return simplejson.dumps({filename: 'False'})


# serve static files
@app.route("/thumbnail/<string:filename>", methods=['GET'])
def get_thumbnail(filename):
    return send_from_directory(app.config['THUMBNAIL_FOLDER'], filename=filename)


@app.route("/data/<string:filename>", methods=['GET'])
def get_file(filename):
    return send_from_directory(os.path.join(app.config['UPLOAD_FOLDER']), filename=filename)


@app.route('/', methods=['GET', 'POST'])
def index():
    return render_template('index.html')


if __name__ == '__main__':
    app.run(debug=True, port=9191)