用于发布数据和图像的 Flask API [英] Flask API to post data and image

问题描述

我有点困惑.我想创建可以发布图像的 API，以及与该图像一起的字典.我该怎么做 ?对于一张图片，我可以这样做.如果我想发布另一个不是文件的变量怎么办，比如说变量 meta_data?

I am little confused. I want to create API that can post image, and one dictionary along with that image. How can I do it ? for one image, I can do it like this. What if I want to post another variable which is not a file, lets say variable meta_data?

url = 'http://127.0.0.1:5000/im_size'
my_img = {'image': open('test.jpg', 'rb')}
r = requests.post(url, files=my_img)

我的 API 脚本也应该有什么变化，如下

What change should be in my API script as well which is as follow

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route("/im_size", methods=["POST"])
def process_image():
    file = request.files['image']
    # Read the image via file.stream
    img = Image.open(file.stream)

    return jsonify({'msg': 'success', 'size': [img.width, img.height]})


if __name__ == "__main__":
    app.run(debug=True)

推荐答案

requests.post 支持 json参数 为该数据设置正确的内容类型('application/json')，然后通过 Flask 中的 request.get_json() 方法访问.

requests.post supports a json argument which sets the correct content type ('application/json') for that data to then be accessed via request.get_json() method in Flask.

但是，当您还提供 files 参数时，会出现这种情况，该参数将内容类型设置为 'multipart/form-data'.

However this plays up when you're also providing the files argument, which sets the content type to 'multipart/form-data'.

在这个线程的帮助下，我找到了解决方案是将您的 JSON 数据作为多部分表单的一部分发送.

With help from this thread I found the solution is to send your JSON data as part of the multipart form.

于是在客户端定义了一个字典，并将其添加到my_img字典中，如下所示:

So on the client define a dictionary, and add it to the my_img dict as follows:

import json

meta_data = {'message':'I am a picture', 'another_message':'About to upload'}

my_img = {'image': open('test.jpg', 'rb'),
          'json_data':  ('j', json.dumps(meta_data), 'application/json')}

然后在服务器端，您还需要import json 并且在您的 process_image 视图函数中，您可以使用以下方法访问该数据:

Then on the server end you'll also need to import json and within your process_image view function you can access that data with:

    json_data = request.files['json_data']
    meta_data = json.load(json_data)

    print (meta_data)
    print (json_data.filename)

服务器输出:

{'message': 'I am a picture', 'another_message': 'About to upload'}
j

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