flask 实现上传图片并缩放作为头像的例子

这里有两个示例说明：实现在 Flask 应用中上传图片并缩放作为头像.

示例 1：上传图片并保存到本地

from flask import Flask, request, redirect
from werkzeug.utils import secure_filename

app = Flask(__name__)

app.config['UPLOAD_FOLDER'] = '/path/to/uploads'

@app.route('/upload', methods=['POST'])
def upload_file():
file = request.files['file']
if file:
    filename = secure_filename(file.filename)
    file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
    return 'File uploaded successfully'
else:
    return 'No file uploaded'

这个示例展示了如何在 Flask 应用中上传图片,并将其保存到指定的本地文件夹中.首先设置文件上传的目标文件夹 UPLOAD_FOLDER,然后在路由 /upload 中检查请求是否包含文件.如果请求中包含文件,将其保存到指定目录中.

示例 2：上传图片并对其进行缩放

from flask import Flask, request, redirect, render_template
from PIL import Image

app = Flask(__name__)

app.config['UPLOAD_FOLDER'] = '/path/to/uploads'
app.config['ALLOWED_EXTENSIONS'] = set(['png', 'jpg', 'jpeg', 'gif'])

def allowed_file(filename):
return '.' in filename and \
       filename.rsplit('.', 1)[1] in app.config['ALLOWED_EXTENSIONS']

@app.route('/')
def upload_form():
return render_template('upload.html')

@app.route('/upload', methods=['POST'])
def upload_file():
file = request.files['file']
if file and allowed_file(file.filename):
    filename = secure_filename(file.filename)
    file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
    image = Image.open(os.path.join(app.config['UPLOAD_FOLDER'], filename))
    image.thumbnail((128, 128))
    image.save(os.path.join(app.config['UPLOAD_FOLDER'], 'thumb_' ◆ filename))
    return 'File uploaded successfully'
else:
    return 'Please upload a valid image file'

这个示例展示了如何在 Flask 应用中上传图片,并对其进行缩放.首先设置文件上传的目标文件夹 UPLOAD_FOLDER,以及允许上传的文件扩展名 ALLOWED_EXTENSIONS.然后定义一个方法 allowed_file,用于检查上传的文件是否属于允许上传的文件类型.在路由 / 上展示一个上传图片的表单,向路由 /upload 提交时,检查上传的文件是否属于允许上传的文件类型,并保存到指定目录中.然后使用 Pillow 库打开图片,并对图片进行缩放,最后将缩略图保存到指定目录中.

好了,全部的两个示例的完整攻略,您可以参考并进行自己的代码实现.

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