實用技巧：如何使用Java呼叫又拍雲端儲存桶介面實作檔案上傳

<dependency>
    <groupId>com.squareup.okhttp3</groupId>
    <artifactId>okhttp</artifactId>
    <version>4.9.1</version>
</dependency>

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class SignatureGenerator {
    private static final String API_KEY = "Your API Key";
    private static final String API_SECRET = "Your API Secret";

    public static String generateSignature(String uri, String date, String method) {
        String rawSignature = String.format("%s&%s&%s", method, uri, date);
        String hashedSignature = hash(rawSignature);
        String signedSignature = String.format("UPYUN %s:%s", API_KEY, hashedSignature);

        return signedSignature;
    }

    private static String hash(String rawSignature) {
        try {
            MessageDigest messageDigest = MessageDigest.getInstance("MD5");
            byte[] hashBytes = messageDigest.digest(rawSignature.getBytes());
            StringBuilder stringBuilder = new StringBuilder();

            for (byte b : hashBytes) {
                stringBuilder.append(String.format("%02x", b & 0xff));
            }

            return stringBuilder.toString();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        return null;
    }
}

import okhttp3.*;

import java.io.File;
import java.io.IOException;

public class FileUploader {
    private static final String BUCKET_NAME = "Your Bucket Name";
    private static final String UPLOAD_URL = "https://v0.api.upyun.com/" + BUCKET_NAME + "/";
    private static final String FILE_PATH = "Path to Your File";
    
    public static void main(String[] args) {
        File file = new File(FILE_PATH);
        String fileName = file.getName();

        String date = Long.toString(System.currentTimeMillis() / 1000);
        String method = "PUT";
        String uri = "/" + BUCKET_NAME + "/" + fileName;

        String signature = SignatureGenerator.generateSignature(uri, date, method);

        OkHttpClient client = new OkHttpClient();
        RequestBody requestBody = RequestBody.create(MediaType.parse("application/octet-stream"), file);
        Request request = new Request.Builder()
                .url(UPLOAD_URL + fileName)
                .header("Date", date)
                .header("Authorization", signature)
                .put(requestBody)
                .build();

        try (Response response = client.newCall(request).execute()) {
            if (response.isSuccessful()) {
                System.out.println("File uploaded successfully!");
            } else {
                System.out.println("Failed to upload file: " + response.code() + " " + response.message());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}