如何将Android中的图片传给我的API并保存到文件夹中？

// Android端代码
public void uploadImageToAPI(Bitmap image) {
    // 将Bitmap转换为字节数组
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    image.compress(Bitmap.CompressFormat.JPEG, 100, baos);
    byte[] imageData = baos.toByteArray();

    // 创建HTTP请求
    HttpURLConnection connection = null;
    try {
        URL url = new URL("http://your-api-url.com/upload");
        connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("POST");
        connection.setDoOutput(true);

        // 设置请求体的内容类型为Multipart/form-data
        connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=----Boundary");

        // 将图片数据写入请求体
        DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());
        outputStream.writeBytes("------Boundary\r\n");
        outputStream.writeBytes("Content-Disposition: form-data; name=\"image\"; filename=\"image.jpg\"\r\n");
        outputStream.writeBytes("Content-Type: image/jpeg\r\n");
        outputStream.writeBytes("\r\n");
        outputStream.write(imageData);
        outputStream.writeBytes("\r\n");
        outputStream.writeBytes("------Boundary--\r\n");
        outputStream.flush();
        outputStream.close();

        // 发送请求并获取响应
        int responseCode = connection.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            // 请求成功，可以处理API返回的响应数据
        } else {
            // 请求失败，可以进行错误处理
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (connection != null) {
            connection.disconnect();
        }
    }
}

// API端代码（示例使用Node.js和Express框架）
const express = require('express');
const multer = require('multer');

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

app.post('/upload', upload.single('image'), (req, res) => {
    // 保存上传的图片到指定文件夹
    const imageFile = req.file;
    // 处理保存图片的逻辑，如将图片移动到指定文件夹、生成缩略图等

    res.status(200).send('Image uploaded successfully');
});

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