Java と Youpai Cloud API のドッキング: 画像処理とストレージを実装するにはどうすればよいですか?

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.MediaType;
import okhttp3.RequestBody;
import java.io.IOException;

public class UpyunAPI {
    // 又拍云API地址
    private static final String API_BASE_URL = "http://api.upyun.com/";

    // Access Key和Secret Key
    private static final String ACCESS_KEY = "your_access_key";
    private static final String SECRET_KEY = "your_secret_key";

    // 图片处理和存储的空间名
    private static final String BUCKET_NAME = "your_bucket_name";
}

private static String generateSignature(String method, String uri, String date, String contentMd5) {
    String sign = method + "&" + uri + "&" + date + "&" + contentMd5 + "&" + SECRET_KEY;
    return DigestUtils.md5Hex(sign);
}

private static String sendRequest(String method, String uri, String date, String contentMd5, String body) throws IOException {
    OkHttpClient client = new OkHttpClient();
    MediaType MEDIA_TYPE = MediaType.parse("application/json");
    RequestBody requestBody = RequestBody.create(MEDIA_TYPE, body);

    String signature = generateSignature(method, uri, date, contentMd5);
    String authorization = "UPYUN " + ACCESS_KEY + ":" + signature;

    Request request = new Request.Builder()
            .url(API_BASE_URL + uri)
            .method(method, requestBody)
            .addHeader("Authorization", authorization)
            .addHeader("Date", date)
            .addHeader("Content-MD5", contentMd5)
            .build();

    Response response = client.newCall(request).execute();
    return response.body().string();
}

// 上传图片
public static String uploadImage(File file, String path) throws IOException {
    String uri = "/" + BUCKET_NAME + "/" + path;
    String date = HttpDate.format(new Date());
    String contentMd5 = DigestUtils.md5Hex(file);
    String body = FileUtils.readFileToString(file, StandardCharsets.UTF_8);

    return sendRequest("PUT", uri, date, contentMd5, body);
}

// 图片缩放
public static String resizeImage(String path, int width, int height) throws IOException {
    String uri = "/" + BUCKET_NAME + "/" + path + "!/fw/" + width + "/fh/" + height;
    String date = HttpDate.format(new Date());
    String contentMd5 = "";

    return sendRequest("POST", uri, date, contentMd5, "");
}

// 图片裁剪
public static String cropImage(String path, int x, int y, int width, int height) throws IOException {
    String uri = "/" + BUCKET_NAME + "/" + path + "!/crop/" + width + "x" + height + "/" + x + "/" + y;
    String date = HttpDate.format(new Date());
    String contentMd5 = "";

    return sendRequest("POST", uri, date, contentMd5, "");
}

public static void main(String[] args) {
    try {
        File file = new File("test.jpg");
        String path = "images/test.jpg";

        String result = uploadImage(file, path);
        System.out.println("Upload result: " + result);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public static void main(String[] args) {
    try {
        String path = "images/test.jpg";
        int width = 300;
        int height = 200;

        String result = resizeImage(path, width, height);
        System.out.println("Resize result: " + result);

        int x = 100;
        int y = 100;
        width = 200;
        height = 200;

        String result = cropImage(path, x, y, width, height);
        System.out.println("Crop result: " + result);
    } catch (IOException e) {
        e.printStackTrace();
    }
}