springboot minio文件分片下载工具类

你可以使用以下工具类来实现Spring Boot与MinIO结合进行文件分片下载：

import io.minio.MinioClient;
import io.minio.ObjectStat;
import io.minio.errors.*;
import io.minio.messages.Part;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.List;

@Component
public class MinioFileDownloader {
    @Autowired
    private MinioClient minioClient;

    public void downloadFile(String bucketName, String objectName, String filePath) throws IOException, NoSuchAlgorithmException, InvalidKeyException, InsufficientDataException, InternalException, InvalidResponseException, ErrorResponseException, XmlParserException, InvalidArgumentException {
        // 获取文件的元数据
        ObjectStat objectStat = minioClient.statObject(bucketName, objectName);
        long fileSize = objectStat.length();

        if (fileSize <= 0) {
            throw new IOException("File is empty");
        }

        // 分片下载文件
        int partSize = 5 * 1024 * 1024; // 分片大小为5MB
        long totalPartsCount = (long) Math.ceil((double) fileSize / partSize);

        for (int partNumber = 1; partNumber <= totalPartsCount; partNumber++) {
            long offset = (partNumber - 1) * partSize;
            long size = Math.min(partSize, fileSize - offset);

            InputStream inputStream = minioClient.getObject(bucketName, objectName, offset, size);

            try (BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream)) {
                byte[] buffer = new byte[(int) size];
                bufferedInputStream.read(buffer, 0, (int) size);

                // 将分片写入文件
                writeToFile(buffer, filePath);
            }
        }
    }

    private void writeToFile(byte[] data, String filePath) throws IOException {
        try (FileOutputStream outputStream = new FileOutputStream(filePath, true)) {
            outputStream.write(data);
        }
    }
}

你可以将以上代码添加到你的Spring Boot项目中，然后通过注入`MinioClient`来使用`MinioFileDownloader`类进行文件的分片下载。请确保已经正确配置了MinIO客户端以及相应的依赖包。