• 依赖jar

<dependency>
	<groupId>io.minio</groupId>
	<artifactId>minio</artifactId>
	<version>8.4.5</version>
</dependency>

• application配置

minio:
  #minio地址
  endpoint: http://127.0.0.1:9000 
  #账号
  accessKey: minioadmin
  #密码         
  secretKey: minioadmin
  #桶名称         
  bucketName: bucketName         

• minioClient配置类

@Configuration
public class MinIoClientConfig {

	@Value("${minio.endpoint}")
	private String endpoint;

	@Value("${minio.accessKey}")
	private String accessKey;

	@Value("${minio.secretKey}")
	private String secretKey;

	@Bean
	MinioClient minioClient() {
		return MinioClient.builder().endpoint(endpoint).credentials(accessKey, secretKey).build();
	}
}

• minio 工具类

@Slf4j
@Component
public class MinioUtils {
 
    @Autowired
    private MinioClient minioClient;
 
    @Autowired
    private MinioInfo minioInfo;
 
 
    /**
     * 上传文件
     *
     * @param file
     * @param bucketName
     * @return
     * @throws Exception
     */
    public String uploadFile(MultipartFile file, String bucketName) {
        if (null == file || 0 == file.getSize()) {
            log.error("msg{}", "上传文件不能为空");
            return null;
        }
        try {
            // 判断是否存在
            createBucket(bucketName);
            // 原文件名
            String originalFilename = file.getOriginalFilename();
            InputStream inputStream = file.getInputStream();
            minioClient.putObject(
                    PutObjectArgs.builder()
                            .bucket(bucketName) // 桶名称
                            .object(originalFilename) // 文件存储名称
                            .stream(inputStream, file.getSize(), -1)
                            .contentType(file.getContentType())
                            .build());
            inputStream.close();
            return minioInfo.getEndpoint() + "/" + bucketName + "/" + originalFilename;
        } catch (Exception e) {
            log.error("上传失败：{}", e.getMessage());
        }
        log.error("msg", "上传失败");
        return null;
    }
 
 
    /**
     * 通过字节流上传
     *
     * @param imageFullPath
     * @param bucketName
     * @param imageData
     * @return
     */
    public String uploadImage(String imageFullPath,
                              String bucketName,
                              byte[] imageData) {
        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(imageData);
        try {
            // 判断是否存在
            createBucket(bucketName);
            minioClient.putObject(PutObjectArgs.builder().bucket(bucketName).object(imageFullPath)
                    .stream(byteArrayInputStream, byteArrayInputStream.available(), -1)
                    .contentType(".jpg")
                    .build());
            return minioInfo.getEndpoint() + "/" + bucketName + "/" + imageFullPath;
        } catch (Exception e) {
            log.error("上传失败：{}", e.getMessage());
        }
        log.error("msg", "上传失败");
        return null;
    }
 
    /**
     * 删除文件
     *
     * @param bucketName
     * @param fileName
     * @return
     */
    public int removeFile(String bucketName, String fileName) {
        try {
            // 判断桶是否存在
            boolean res = minioClient.bucketExists(BucketExistsArgs.builder().bucket(bucketName).build());
            if (res) {
                // 删除文件
                minioClient.removeObject(RemoveObjectArgs.builder().bucket(bucketName)
                        .object(fileName).build());
            }
        } catch (Exception e) {
            System.out.println("删除文件失败");
            e.printStackTrace();
            return 1;
        }
        System.out.println("删除文件成功");
        return 0;
    }
 
    /**
     * 下载文件
     *
     * @param fileName
     * @param bucketName
     * @param response
     */
    public void fileDownload(String fileName,
                             String bucketName,
                             HttpServletResponse response) {
 
        InputStream inputStream = null;
        OutputStream outputStream = null;
        try {
            if (StringUtils.isBlank(fileName)) {
                response.setHeader("Content-type", "text/html;charset=UTF-8");
                String data = "文件下载失败";
                OutputStream ps = response.getOutputStream();
                ps.write(data.getBytes("UTF-8"));
                return;
            }
            outputStream = response.getOutputStream();
            // 获取文件对象
            inputStream = minioClient.getObject(GetObjectArgs.builder().bucket(bucketName).object(fileName).build());
            byte buf[] = new byte[1024];
            int length = 0;
            response.reset();
            response.setHeader("Content-Disposition", "attachment;filename=" +
                    URLEncoder.encode(fileName.substring(fileName.lastIndexOf("/") + 1), "UTF-8"));
            response.setContentType("application/octet-stream");
            response.setCharacterEncoding("UTF-8");
            // 输出文件
            while ((length = inputStream.read(buf)) > 0) {
                outputStream.write(buf, 0, length);
            }
            System.out.println("下载成功");
            inputStream.close();
        } catch (Throwable ex) {
            response.setHeader("Content-type", "text/html;charset=UTF-8");
            String data = "文件下载失败";
            try {
                OutputStream ps = response.getOutputStream();
                ps.write(data.getBytes("UTF-8"));
            } catch (IOException e) {
                e.printStackTrace();
            }
        } finally {
            try {
                outputStream.close();
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
 
 
 
    /**
     * 通过字节流下载
     * @param fileName 文件名称
     * @param bucketName 桶名称
     * @return
     */
    public byte[] byteDownload(String fileName,
                               String bucketName) {
        InputStream inputStream = null;
        try {
            inputStream = minioClient.getObject(GetObjectArgs.builder()
                    .bucket(bucketName)
                    .object(fileName)
                    .build());
            byte[] buffer = StreamUtils.copyToByteArray(inputStream);
            inputStream.read(buffer);
            inputStream.close();
            return buffer;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
 
 
    @SneakyThrows
    public void createBucket(String bucketName) {
        // 如果不存在就创建
        if (!minioClient.bucketExists(BucketExistsArgs.builder().bucket(bucketName).build())) {
            minioClient.makeBucket(MakeBucketArgs.builder().bucket(bucketName).build());
        }
    }
}