Java と Tencent Cloud COS を使用した分散ファイル ストレージ システムの実装

import com.qcloud.cos.COSClient;
import com.qcloud.cos.model.PutObjectRequest;
import com.qcloud.cos.model.PutObjectResult;

public class FileUploader {
    private static final String BUCKET_NAME = "your-bucket-name";

    public static void uploadFile(String filePath, String key) {
        COSClient cosClient = CosClientFactory.createClient();
        PutObjectRequest putObjectRequest = new PutObjectRequest(BUCKET_NAME, key, new File(filePath));
        PutObjectResult putObjectResult = cosClient.putObject(putObjectRequest);
        cosClient.shutdown();
    }
}

import com.qcloud.cos.COSClient;
import com.qcloud.cos.model.GetObjectRequest;
import com.qcloud.cos.model.ObjectMetadata;
import com.qcloud.cos.model.S3Object;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class FileDownloader {
    private static final String BUCKET_NAME = "your-bucket-name";

    public static void downloadFile(String key, String filePath) {
        COSClient cosClient = CosClientFactory.createClient();
        GetObjectRequest getObjectRequest = new GetObjectRequest(BUCKET_NAME, key);
        S3Object s3Object = cosClient.getObject(getObjectRequest);
        InputStream objectContent = s3Object.getObjectContent();
        File file = new File(filePath);
        try (FileOutputStream fos = new FileOutputStream(file)) {
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = objectContent.read(buffer)) != -1) {
                fos.write(buffer, 0, bytesRead);
            }
            fos.flush();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            objectContent.close();
            cosClient.shutdown();
        }
    }
}

import com.qcloud.cos.COSClient;
import com.qcloud.cos.model.DeleteObjectRequest;
import com.qcloud.cos.model.DeleteObjectResult;

public class FileDeleter {
    private static final String BUCKET_NAME = "your-bucket-name";

    public static void deleteFile(String key) {
        COSClient cosClient = CosClientFactory.createClient();
        DeleteObjectRequest deleteObjectRequest = new DeleteObjectRequest(BUCKET_NAME, key);
        DeleteObjectResult deleteObjectResult = cosClient.deleteObject(deleteObjectRequest);
        cosClient.shutdown();
    }
}