燒瓶和reactjs文件上傳不起作用

Question

我是 python 燒瓶的新手，我在后端使用燒瓶，在前端使用 js，對數據庫使用 pymongo。 我想將文件從 ReactJs 上傳到 Flask 服務器，在執行第二種方法時出現錯誤，我該怎么做。 下面是我嘗試過的代碼。

我試過兩個例子，一個是有效的，另一個不是我不知道為什么。

werkzeug.exceptions.BadRequestKeyError: 400 Bad Request: The browser (or proxy) sent a request that this server could not understand. KeyError: 'file'

1. 直接將文件發送到 API。 情況1

Python代碼

import os
from flask import Flask, flash, request, redirect, url_for
from werkzeug.utils import secure_filename

UPLOAD_FOLDER = '/path/to/the/uploads'
ALLOWED_EXTENSIONS = set([ 'png', 'jpg', 'jpeg'])

app = Flask(__name__)
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
@app.route('/api/users/add_photo', methods=['POST', "GET"])
def upload_file():
    if request.method == 'POST':
        # check if the post request has the file part
        if 'file' not in request.files:
            flash('No file part')
            return redirect(request.url)
        file = request.files['file']
        # if user does not select file, browser also
        # submit a empty part without filename
        if file.filename == '':
            flash('No selected file')
            return redirect(request.url)
        if file and allowed_file(file.filename):
            filename = secure_filename(file.filename)
            file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
            image = upload(open(filename, 'rb'))
            user_id = user.insert({"file":image})
            return jsonify({'result': "file Upload successfully!!!"})

onSubmitImage(e) {
    let file = this.state.file;
    let formData = new FormData();
    formData.append("file", file);
    this.props.imageUpload(formData);
  }

上面的例子工作正常

2. 將文件發送到對象中的 API。 案例二

Python代碼

import os
from flask import Flask, flash, request, redirect, url_for
from werkzeug.utils import secure_filename

UPLOAD_FOLDER = '/path/to/the/uploads'
ALLOWED_EXTENSIONS = set([ 'png', 'jpg', 'jpeg'])

app = Flask(__name__)
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
@app.route('/api/users/add_photo', methods=['POST', "GET"])
def upload_file():
    if request.method == 'POST':
        # check if the post request has the file part
        if 'file' not in request.files:
            flash('No file part')
            return redirect(request.url)
        file = request.files['file']
        name = request.get_json(force=True)["name"]
        last_name = request.get_json(force=True)["last_name"]
        email = request.get_json(force=True)["email"]
        # if user does not select file, browser also
        # submit a empty part without filename
        if file.filename == '':
            flash('No selected file')
            return redirect(request.url)
        if file and allowed_file(file.filename):
            filename = secure_filename(file.filename)
            file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
            image = upload(open(filename, 'rb'))
            user_id = user.insert({"file":image,"name":name,"last_name":last_name,"email":email})
            return jsonify({'result': "file Upload successfully!!!"})

 onSubmitImage(e) {
    let file = this.state.file;
    let formData = new FormData();
    formData.append("file", file);
    const data = {
      file: formData
      name: this.state.name
      last_name: this.state.last_name
      email: this.state.last_name
    };
    this.props.imageUpload(data);
  }

我不知道為什么第一個有效，第二個沒有。 我想實現第二個示例，因為還有其他數據，如姓名、姓氏、帶有圖像文件的電子郵件。

Answer 1

您需要將您的數據添加到您的 FormData()-即

let file = this.state.file;
let formData = new FormData();
formData.append("file", file);
formData.append("name", this.state.name);
formData.append("last_name", this.state.last_name)
formData.append("email", this.state.last_name)
this.props.imageUpload(formData);