minio - java 最佳性能分片上传、断点续传示例

以下是一个使用Java的Minio客户端实现最佳性能分片上传和断点续传的示例：

import io.minio.MinioClient;
import io.minio.ObjectWriteResponse;
import io.minio.errors.*;
import io.minio.messages.Item;
import org.xmlpull.v1.XmlPullParserException;

import java.io.*;
import java.security.NoSuchAlgorithmException;
import java.util.List;

public class MinioExample {

    private static final String ENDPOINT = "https://play.min.io";
    private static final String ACCESS_KEY = "YOUR_ACCESS_KEY";
    private static final String SECRET_KEY = "YOUR_SECRET_KEY";
    private static final String BUCKET_NAME = "test-bucket";
    private static final String OBJECT_NAME = "test-object";

    // 分片大小（默认：5MB）
    private static final int PART_SIZE = 5 * 1024 * 1024;

    public static void main(String[] args) throws IOException, InvalidKeyException, NoSuchAlgorithmException, ServerException, InternalException, XmlPullParserException, InsufficientDataException, ErrorResponseException, InvalidResponseException, InvalidBucketNameException, RegionConflictException {
        MinioClient minioClient = new MinioClient(ENDPOINT, ACCESS_KEY, SECRET_KEY);
        if (!minioClient.bucketExists(BUCKET_NAME)) {
            minioClient.makeBucket(BUCKET_NAME);
        }

        // 判断对象是否存在
        boolean objectExists = minioClient.objectExists(BUCKET_NAME, OBJECT_NAME);
        if (objectExists) {
            // 获取对象元数据
            List<Item> objectMetadata = minioClient.listObjects(BUCKET_NAME, OBJECT_NAME, true).get();
            long objectSize = objectMetadata.get(0).size();

            // 获取已上传分片列表
            List<io.minio.messages.Part> objectParts = minioClient.listObjectParts(BUCKET_NAME, OBJECT_NAME).get();
            int partCount = objectParts.size();

            // 断点续传
            InputStream inputStream = new FileInputStream(new File("test-file"));
            byte[] buffer = new byte[PART_SIZE];
            long bytesRead;
            int partNumber = partCount + 1;
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                if (objectSize + bytesRead > PART_SIZE * partNumber) {
                    // 完成当前分片上传
                    ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(buffer);
                    minioClient.uploadPart(BUCKET_NAME, OBJECT_NAME, partNumber,
                            byteArrayInputStream, bytesRead);
                    byteArrayInputStream.close();
                    partNumber++;
                } else {
                    // 上传剩余部分
                    int remainderSize = (int) (bytesRead - (PART_SIZE * partNumber - objectSize));
                    ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(buffer, 0, remainderSize);
                    ObjectWriteResponse objectWriteResponse = minioClient.uploadPart(BUCKET_NAME, OBJECT_NAME, partNumber,
                            byteArrayInputStream, remainderSize);
                    // 合并上传分片
                    minioClient.completeMultipartUpload(BUCKET_NAME, OBJECT_NAME,
                            objectWriteResponse.uploadId(), objectParts);
                    byteArrayInputStream.close();
                    break;
                }
            }
            inputStream.close();
        } else {
            // 新建上传
            InputStream inputStream = new FileInputStream(new File("test-file"));
            ObjectWriteResponse objectWriteResponse = minioClient.initiateMultipartUpload(BUCKET_NAME, OBJECT_NAME);
            byte[] buffer = new byte[PART_SIZE];
            long bytesRead;
            int partNumber = 1;
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(buffer);
                minioClient.uploadPart(BUCKET_NAME, OBJECT_NAME, partNumber,
                        byteArrayInputStream, bytesRead);
                byteArrayInputStream.close();
                partNumber++;
            }
            inputStream.close();

            // 合并上传分片
            List<io.minio.messages.Part> objectParts = minioClient.listObjectParts(BUCKET_NAME, OBJECT_NAME).get();
            minioClient.completeMultipartUpload(BUCKET_NAME, OBJECT_NAME,
                    objectWriteResponse.uploadId(), objectParts);
        }
    }
}

代码解析：

- 设置Minio服务器地址、访问凭证和桶名、对象名；
- 判断对象是否存在、获取对象元数据和已上传分片列表；
- 如果对象存在，进行断点续传并上传剩余的分片片段，最后将上传的分片合并；
- 如果对象不存在，进行新建上传，并上传分片片段，最后将上传的分片合并。

该示例代码中使用的分片大小为5MB，可以根据实际需要进行调整。同时，还需要注意的是，该示例代码中假设文件大小为分片大小的整数倍，因此，在实际应用中可能需要对代码进行相应的修改。