Minio模板类:

@RequiredArgsConstructor
public class MinioTemplate implements InitializingBean {
   private final String endpoint;
   private final String accessKey;
   private final String secretKey;
   private MinioClient client;

   /**
    * 创建bucket
    *
    * @param bucketName bucket名称
    */
   @SneakyThrows
   public void createBucket(String bucketName) {
      if (!client.bucketExists(bucketName)) {
         client.makeBucket(bucketName);
      }
   }

   /**
    * 获取全部bucket
    * <p>
    * https://docs.minio.io/cn/java-client-api-reference.html#listBuckets
    */
   @SneakyThrows
   public List<Bucket> getAllBuckets() {
      return client.listBuckets();
   }

   /**
    * 根据bucketName获取信息
    * @param bucketName bucket名称
    */
   @SneakyThrows
   public Optional<Bucket> getBucket(String bucketName) {
      return client.listBuckets().stream().filter(b -> b.name().equals(bucketName)).findFirst();
   }

   /**
    * 根据bucketName删除信息
    * @param bucketName bucket名称
    */
   @SneakyThrows
   public void removeBucket(String bucketName) {
      client.removeBucket(bucketName);
   }

   /**
    * 根据文件前置查询文件
    *
    * @param bucketName bucket名称
    * @param prefix     前缀
    * @param recursive  是否递归查询
    * @return MinioItem 列表
    */
   @SneakyThrows
   public List<MinioItem> getAllObjectsByPrefix(String bucketName, String prefix, boolean recursive) {
      List<MinioItem> objectList = new ArrayList<>();
      Iterable<Result<Item>> objectsIterator = client
            .listObjects(bucketName, prefix, recursive);

      while (objectsIterator.iterator().hasNext()) {
         objectList.add(new MinioItem(objectsIterator.iterator().next().get()));
      }
      return objectList;
   }

   /**
    * 获取文件外链
    *
    * @param bucketName bucket名称
    * @param objectName 文件名称
    * @param expires    过期时间 <=7
    * @return url
    */
   @SneakyThrows
   public String getObjectURL(String bucketName, String objectName, Integer expires) {
      return client.presignedGetObject(bucketName, objectName, expires);
   }

   /**
    * 获取文件
    *
    * @param bucketName bucket名称
    * @param objectName 文件名称
    * @return 二进制流
    */
   @SneakyThrows
   public InputStream getObject(String bucketName, String objectName) {
      return client.getObject(bucketName, objectName);
   }

   /**
    * 上传文件
    *
    * @param bucketName bucket名称
    * @param objectName 文件名称
    * @param stream     文件流
    * @throws Exception https://docs.minio.io/cn/java-client-api-reference.html#putObject
    */
   public void putObject(String bucketName, String objectName, InputStream stream) throws Exception {
      client.putObject(bucketName, objectName, stream, stream.available(), "application/octet-stream");
   }

   /**
    * 上传文件
    *
    * @param bucketName  bucket名称
    * @param objectName  文件名称
    * @param stream      文件流
    * @param size        大小
    * @param contextType 类型
    * @throws Exception https://docs.minio.io/cn/java-client-api-reference.html#putObject
    */
   public void putObject(String bucketName, String objectName, InputStream stream, long size, String contextType) throws Exception {
      client.putObject(bucketName, objectName, stream, size, contextType);
   }

   /**
    * 获取文件信息
    *
    * @param bucketName bucket名称
    * @param objectName 文件名称
    * @throws Exception https://docs.minio.io/cn/java-client-api-reference.html#statObject
    */
   public ObjectStat getObjectInfo(String bucketName, String objectName) throws Exception {
      return client.statObject(bucketName, objectName);
   }

   /**
    * 删除文件
    *
    * @param bucketName bucket名称
    * @param objectName 文件名称
    * @throws Exception https://docs.minio.io/cn/java-client-api-reference.html#removeObject
    */
   public void removeObject(String bucketName, String objectName) throws Exception {
      client.removeObject(bucketName, objectName);
   }

   @Override
   public void afterPropertiesSet() throws Exception {
      Assert.hasText(endpoint, "Minio url 为空");
      Assert.hasText(accessKey, "Minio accessKey为空");
      Assert.hasText(secretKey, "Minio secretKey为空");
      this.client = new MinioClient(endpoint, accessKey, secretKey);
   }

文件上传方法:

public String upload(@RequestParam("file") MultipartFile file) {
    String fileName  = file.getOriginalFilename();
    Map<String, String> resultMap = new HashMap<>(4);
    resultMap.put("bucketName", "bucketName");
    resultMap.put("fileName", fileName);
    try {
        minioTemplate.putObject("bucketName", fileName, file.getInputStream());

　　} catch (Exception e) {
        return "上传失败";
    }
    return "上传成功";
}

文件下载方法:

public void download(String fileName, HttpServletResponse response, HttpServletRequest request) {
    String userAgent = request.getHeader("User-Agent");
    String[] nameArray = StrUtil.split(fileName, "-");
    try (InputStream inputStream = minioTemplate.getObject(nameArray[0], nameArray[1])) {
        //解决乱码
        if ( //IE 8 至 IE 10
                userAgent.toUpperCase().contains("MSIE") ||
                         //IE 11
                        userAgent.contains("Trident/7.0")) {
            fileName = java.net.URLEncoder.encode(nameArray[1], "UTF-8");
        } else{
            fileName = new String(nameArray[1].getBytes("UTF-8"),"iso-8859-1");
        }
        response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
        response.setContentType("application/force-download");
        response.setCharacterEncoding("UTF-8");
        IoUtil.copy(inputStream, response.getOutputStream());
    } catch (Exception e) {
        log.error("文件读取异常", e);
    }
}

转自：https://www.cnblogs.com/youyouxiaosheng-lh/p/11026877.html