如何通过编程方式将多个文件从android发送到服务器node.js？

OkHttpClient client = new OkHttpClient();

// 构建Multipart请求体
MultipartBody.Builder requestBodyBuilder = new MultipartBody.Builder()
        .setType(MultipartBody.FORM);

// 添加要上传的文件
File file1 = new File("/path/to/file1");
requestBodyBuilder.addFormDataPart("file", file1.getName(),
        RequestBody.create(MediaType.parse("application/octet-stream"), file1));

File file2 = new File("/path/to/file2");
requestBodyBuilder.addFormDataPart("file", file2.getName(),
        RequestBody.create(MediaType.parse("application/octet-stream"), file2));

// 构建请求
Request request = new Request.Builder()
        .url("http://your-nodejs-server/upload")
        .post(requestBodyBuilder.build())
        .build();

// 发送请求
Response response = client.newCall(request).execute();

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

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

// 处理文件上传的路由
app.post('/upload', upload.array('file'), (req, res) => {
  // 获取上传的文件数组
  const files = req.files;

  // 对每个文件进行处理
  files.forEach(file => {
    // 保存文件到指定目录
    fs.renameSync(file.path, `uploads/${file.originalname}`);
  });

  res.send('File uploaded successfully!');
});

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