springboot中实现分片上传文件到minio

要实现分片上传文件到Minio，可以使用Spring Boot的MultipartResolver来处理分片上传文件。首先，需要引入Minio的依赖：

<dependency>
    <groupId>io.minio</groupId>
    <artifactId>minio</artifactId>
    <version>7.1.0</version>
</dependency>

然后，需要配置Minio的连接信息：

@Configuration
public class MinioConfig {
 
    @Value("${minio.accesskey}")
    private String accessKey;
 
    @Value("${minio.secretkey}")
    private String secretKey;
 
    @Value("${minio.endpoint}")
    private String endpoint;
 
    @Value("${minio.bucketname}")
    private String bucketName;
 
    @Bean
    public MinioClient minioClient() {
        try {
            return new MinioClient(endpoint, accessKey, secretKey);
        } catch (Exception e) {
            throw new RuntimeException("Failed to create MinioClient", e);
        }
    }
 
    @Bean
    public BucketExistsArgs bucketExistsArgs() {
        return BucketExistsArgs.builder().bucket(bucketName).build();
    }
 
    @Bean
    public MakeBucketArgs makeBucketArgs() {
        return MakeBucketArgs.builder().bucket(bucketName).build();
    }
}

接下来，可以编写上传文件的Controller：

@RestController
public class FileController {
 
    @Autowired
    private MinioClient minioClient;
 
    @Value("${minio.bucketname}")
    private String bucketName;
 
    @PostMapping("/upload")
    public ResponseEntity<String> upload(
            @RequestParam("file") MultipartFile file,
            @RequestParam("chunk") int chunk,
            @RequestParam("chunks") int chunks,
            @RequestParam("id") String id) throws IOException, InvalidKeyException, NoSuchAlgorithmException, InsufficientDataException, InvalidResponseException, ErrorResponseException, InternalException, InvalidArgumentException {
 
        String fileName = file.getOriginalFilename();
        String objectName = id + "/" + fileName;
 
        if (chunk == 0) {
            // 如果是第一个分片，则创建一个空的对象
            minioClient.putObject(PutObjectArgs.builder()
                    .bucket(bucketName)
                    .object(objectName)
                    .contentType(file.getContentType())
                    .build());
        }
 
        // 计算分片的偏移量
        long partSize = 5 * 1024 * 1024;
        long offset = partSize * chunk;
 
        // 读取分片数据
        byte[] data = file.getBytes();
 
        // 上传分片
        minioClient.uploadPart(UploadPartArgs.builder()
                .bucket(bucketName)
                .object(objectName)
                .uploadId(id)
                .partNumber(chunk + 1)
                .offset(offset)
                .data(new ByteArrayInputStream(data))
                .partSize(data.length)
                .build());
 
        if (chunk == chunks - 1) {
            // 如果是最后一个分片，则完成分片上传
            List<PartETag> partETags = new ArrayList<>();
            for (int i = 0; i < chunks; i++) {
                partETags.add(new PartETag(i + 1, Integer.toString(i + 1)));
            }
            minioClient.completeMultipart(CompleteMultipartArgs.builder()
                    .bucket(bucketName)
                    .object(objectName)
                    .uploadId(id)
                    .parts(partETags)
                    .build());
        }
 
        return ResponseEntity.ok().body("Upload completed.");
    }
}

在以上代码中，我们使用了Minio的Java SDK来上传分片。需要注意的是，分片大小应该根据实际情况进行调整。在这里，我们设置分片大小为5MB。