将图像写入文件，通过Node中的HTTP请求接收

const http = require('http');

const server = http.createServer((req, res) => {
  // 处理请求
});

const port = 3000;
server.listen(port, () => {
  console.log(`Server running on port ${port}`);
});

const fs = require('fs');

const server = http.createServer((req, res) => {
  if (req.method === 'POST' && req.url === '/upload') {
    // 创建一个可写流
    const fileStream = fs.createWriteStream('image.jpg');

    // 监听请求的data事件，将接收到的数据写入文件
    req.on('data', (chunk) => {
      fileStream.write(chunk);
    });

    // 监听请求的end事件，表示数据接收完毕，关闭可写流
    req.on('end', () => {
      fileStream.end();
      res.end('File uploaded successfully');
    });
  } else {
    res.statusCode = 404;
    res.end('Not found');
  }
});

const http = require('http');
const fs = require('fs');

const imagePath = 'path/to/image.jpg';

// 读取图像文件
fs.readFile(imagePath, (err, data) => {
  if (err) throw err;

  // 构建请求选项
  const options = {
    hostname: 'localhost',
    port: 3000,
    path: '/upload',
    method: 'POST',
    headers: {
      'Content-Type': 'image/jpeg',
      'Content-Length': data.length
    }
  };

  // 发送请求
  const req = http.request(options, (res) => {
    res.on('data', (chunk) => {
      console.log(chunk.toString());
    });
  });

  // 将图像数据作为请求体发送
  req.write(data);
  req.end();
});