使用Multer将图像从React上传到Express服务器

import React, { useState } from 'react';
import axios from 'axios';

const ImageUpload = () => {
  const [selectedImage, setSelectedImage] = useState(null);

  const handleImageChange = (event) => {
    setSelectedImage(event.target.files[0]);
  };

  const handleUpload = () => {
    const formData = new FormData();
    formData.append('image', selectedImage);

    axios.post('/upload', formData)
      .then(response => {
        console.log(response.data);
      })
      .catch(error => {
        console.error(error);
      });
  };

  return (
    <div>
      <input type="file" onChange={handleImageChange} />
      <button onClick={handleUpload}>Upload</button>
    </div>
  );
};

export default ImageUpload;

const express = require('express');
const multer = require('multer');

const app = express();
const upload = multer({ dest: 'uploads/' });

app.post('/upload', upload.single('image'), (req, res) => {
  // 处理上传的图像文件
  const file = req.file;
  console.log(file);

  // 返回上传成功的消息
  res.json({ message: 'Upload successful' });
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});