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Spring Boot 集成 MinIO 实现文件上传

一、 Minio 服务准备

MinIO的搭建过程参考 Docker 搭建 MinIO 对象存储。

登录MinIO控制台，新建一个 Bucket，修改 Bucket 权限为公开。

二、MinIO 集成

1. 添加 MinIO 依赖

<!-- https://mvnrepository.com/artifact/io.minio/minio -->
<dependency><groupId>io.minio</groupId><artifactId>minio</artifactId><version>${minio.version}</version>
</dependency>

2. 在项目配置文件application.yml中添加自定义配置。properties 文件自行转换

minio:host: http://【服务器公网ip】:【minio运行端口号，默认9000】/access-key: 账号secret-key: 密码

3. 创建配置文件类

@Data
@Component
public class MinioConfig {@Value(value = "${minio.host}")private String host;@Value(value = "${minio.access-key}")private String accessKey;@Value(value = "${minio.secret-key}")private String secretKey;@Beanpublic MinioClient minioClient(){return MinioClient.builder().endpoint(host).credentials(accessKey, secretKey).build();}
}

4. 创建文件上传工具类

@Component
@Slf4j
@AllArgsConstructor
public class MinioUtils {private final MinioClient minioClient;private final MinioConfig minioConfig;/*** 初始化Bucket*/private void createBucket(String bucketName) {// 设置公开读写String POLICY_PATTERN = "{\"Version\":\"2012-10-17\",\"Statement\":[{\"Effect\":\"Allow\",\"Principal\":{\"AWS\":[\"*\"]},\"Action\":[\"s3:GetObject\"],\"Resource\":[\"arn:aws:s3:::%s/*\"]}]}";try {// 判断 BucketName 是否存在if (!bucketExists(bucketName)) {minioClient.makeBucket(MakeBucketArgs.builder().bucket(bucketName).build());}minioClient.setBucketPolicy(SetBucketPolicyArgs.builder().bucket(bucketName).config(String.format(POLICY_PATTERN, bucketName)).build());} catch (Exception e) {e.printStackTrace();}}/*** 验证bucketName是否存在** @return boolean true:存在*/public boolean bucketExists(String bucketName) {if (StringUtils.isBlank(bucketName)) {throw new ServerException(ErrorCode.BUCKET_NAME_NOT_NULL);}boolean flag = true;try {flag = minioClient.bucketExists(BucketExistsArgs.builder().bucket(bucketName).build());} catch (Exception e) {e.printStackTrace();}return flag;}/*** 获取全部bucket* <p>*/public List<String> getAllBuckets() {List<String> list = null;try {final List<Bucket> buckets = minioClient.listBuckets();list = new ArrayList<>(buckets.size());for (Bucket bucket : buckets) {list.add(bucket.name());}} catch (Exception e) {e.printStackTrace();}return list;}/*** 根据bucketName获取信息** @param bucketName bucket名称* @return*/public String getBucket(String bucketName) throws Exception {final Optional<Bucket> first = minioClient.listBuckets().stream().filter(b -> b.name().equals(bucketName)).findFirst();String name = null;if (first.isPresent()) {name = first.get().name();}return name;}/*** 获取桶中文件名和大小列表** @param bucketName bucket名称* @param recursive  查询是否递归* @return*/public List<Object> getFileList(String bucketName, boolean recursive) {if (StringUtils.isEmpty(bucketName)) {throw new ServerException(ErrorCode.BUCKET_NAME_NOT_NULL);}List<Object> items = new ArrayList<>();try {Iterable<Result<Item>> myObjects = minioClient.listObjects(ListObjectsArgs.builder().bucket(bucketName).prefix("/2022-08-03/4674a894-abaf-48cb-9ea9-40a4e8560af9/Desktop").recursive(recursive).build());Iterator<Result<Item>> iterator = myObjects.iterator();String format = "{'fileName':'%s','fileSize':'%s'}";for (Result<Item> myObject : myObjects) {System.out.println(myObject.get().objectName());}while (iterator.hasNext()) {Item item = iterator.next().get();items.add(JSON.parse(String.format(format, item.objectName(), formatFileSize(item.size()))));
//                items.add(JSON.parse(String.format(format, "/".concat("test").concat("/").concat(item.objectName()), formatFileSize(item.size()))));}} catch (Exception e) {e.printStackTrace();log.info(e.getMessage());}items.remove(0);return items;}/*** 文件上传** @param bucketName 存储桶名称* @param file       file* @return map*/public Map<String, Object> uploadFile(String bucketName, MultipartFile[] file) {if (file == null || file.length == 0) {throw new ServerException(ErrorCode.FILE_NAME_NOT_NULL);}createBucket(bucketName);List<String> urlList = new ArrayList<>(file.length);for (MultipartFile multipartFile : file) {String originFileName = multipartFile.getOriginalFilename();if (StringUtils.isBlank(originFileName)) {throw new ServerException(ErrorCode.FILE_NAME_NOT_NULL);}String[] originFileNameArr = originFileName.split("\\.");String suffix = originFileNameArr[originFileNameArr.length - 1];String newFileName = UUID.randomUUID().toString().replace("-", "").concat(".").concat(suffix);urlList.add(String.format("%s%s/%s", minioConfig.getHost(), bucketName, newFileName));try {// 文件上传InputStream in = multipartFile.getInputStream();minioClient.putObject(PutObjectArgs.builder().bucket(bucketName).object(newFileName).stream(in, multipartFile.getSize(), -1).contentType(multipartFile.getContentType()).build());in.close();} catch (Exception e) {log.error(e.getMessage());}}Map<String, Object> data = new HashMap<>();data.put("bucketName", bucketName);data.put("urlList", urlList);return data;}/*** 获取上传文件的完整路径** @param bucketName 桶名称* @param fileName   文件名* @return*/public String getPresignedObjectUrl(String bucketName, String fileName) {if (StringUtils.isEmpty(bucketName)) {throw new ServerException(ErrorCode.BUCKET_NAME_NOT_NULL);}if (StringUtils.isEmpty(fileName)) {throw new ServerException(ErrorCode.FILE_NAME_NOT_NULL);}// 验证桶是否存在在final boolean validationBucket = bucketExists(bucketName);if (!validationBucket) {throw new ServerException(ErrorCode.BUCKET_NOT_EXIST);}// 验证文件是否存在final boolean validationFileName = doFileNameExist(bucketName, fileName);if (!validationFileName) {throw new ServerException(ErrorCode.FILE_NOT_EXIST);}String url = null;try {// 获取桶和文件的完整路径url = minioClient.getPresignedObjectUrl(GetPresignedObjectUrlArgs.builder().bucket(bucketName).object(fileName).method(Method.GET).build());} catch (MinioException e) {log.error("Error occurred: " + e);} catch (Exception e) {e.printStackTrace();}return url;}/*** 创建文件夹或目录** @param bucketName 存储桶* @param objectName 目录路径*/public Map<String, String> putDirObject(String bucketName, String objectName) throws Exception {// 判断桶是否存在if (!bucketExists(bucketName)) {throw new ServerException(ErrorCode.BUCKET_NAME_NOT_EXIST);}final ObjectWriteResponse response = minioClient.putObject(PutObjectArgs.builder().bucket(bucketName).object(objectName).stream(new ByteArrayInputStream(new byte[]{}), 0, -1).build());Map<String, String> map = new HashMap<>();map.put("etag", response.etag());map.put("versionId", response.versionId());return map;}/*** 判断文件是否存在** @param fileName 对象* @return true：存在*/public boolean doFileNameExist(String bucketName, String fileName) {if (StringUtils.isEmpty(bucketName)) {throw new ServerException(ErrorCode.BUCKET_NAME_NOT_NULL);}if (StringUtils.isEmpty(fileName)) {throw new ServerException(ErrorCode.FILE_NAME_NOT_NULL);}boolean exist = true;try {minioClient.statObject(StatObjectArgs.builder().bucket(bucketName).object(fileName).build());} catch (Exception e) {exist = false;}return exist;}/*** 文件下载** @param response* @param fileName*/public void downloadFile(HttpServletResponse response, String bucketName, String fileName) {if (StringUtils.isEmpty(bucketName)) {throw new ServerException(ErrorCode.BUCKET_NAME_NOT_NULL);}if (StringUtils.isEmpty(fileName)) {throw new ServerException(ErrorCode.FILE_NAME_NOT_NULL);}// 判断文件是否存在final boolean flag = doFileNameExist(bucketName, fileName);if (!flag) {throw new ServerException(ErrorCode.FILE_NOT_EXIST);}InputStream in = null;try {// 获取对象信息StatObjectResponse stat = minioClient.statObject(StatObjectArgs.builder().bucket(bucketName).object(fileName).build());response.setContentType(stat.contentType());response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));// 文件下载in = minioClient.getObject(GetObjectArgs.builder().bucket(bucketName).object(fileName).build());IOUtils.copy(in, response.getOutputStream());} catch (Exception e) {log.error(e.getMessage());} finally {if (in != null) {try {in.close();} catch (IOException e) {log.error(e.getMessage());}}}}/*** 删除文件** @param bucketName bucket名称* @param fileName   文件名称*                   说明：当前方法不能真正删除，需要验证*/public void deleteFile(String bucketName, String fileName) {if (StringUtils.isEmpty(bucketName)) {throw new ServerException(ErrorCode.BUCKET_NAME_NOT_NULL);}if (StringUtils.isEmpty(fileName)) {throw new ServerException(ErrorCode.FILE_NAME_NOT_NULL);}try {minioClient.removeObject(RemoveObjectArgs.builder().bucket(bucketName).object(fileName).build());} catch (Exception e) {log.error(e.getMessage());e.printStackTrace();}}/*** 批量文件删除** @param bucketName bucket名称* @param fileNames  文件名*/public void deleteBatchFile(String bucketName, List<String> fileNames) {if (StringUtils.isEmpty(bucketName)) {throw new ServerException(ErrorCode.BUCKET_NAME_NOT_NULL);}if (CollectionUtils.isEmpty(fileNames)) {throw new ServerException(ErrorCode.FILE_NAME_NOT_NULL);}try {List<DeleteObject> objects = new LinkedList<>();for (String fileName : fileNames) {objects.add(new DeleteObject(fileName));}Iterable<Result<DeleteError>> results =minioClient.removeObjects(RemoveObjectsArgs.builder().bucket(bucketName).objects(objects).build());for (Result<DeleteError> result : results) {DeleteError error = result.get();log.error("Error occurred: " + error);}} catch (Exception e) {log.error("批量删除失败！error:{}", e);}}/*** 文件大小** @param fileS* @return*/private static String formatFileSize(long fileS) {DecimalFormat df = new DecimalFormat("#.00");String fileSizeString = "";String wrongSize = "0B";if (fileS == 0) {return wrongSize;}if (fileS < 1024) {fileSizeString = df.format((double) fileS) + " B";} else if (fileS < 1048576) {fileSizeString = df.format((double) fileS / 1024) + " KB";} else if (fileS < 1073741824) {fileSizeString = df.format((double) fileS / 1048576) + " MB";} else {fileSizeString = df.format((double) fileS / 1073741824) + " GB";}return fileSizeString;}
}

三、上传文件实战

新建 UploadController，实现上传文件接口。

@Tag(name = "基础接口")
@AllArgsConstructor
@RestController
@RequestMapping("/file")
public class UploadController {private final MinioUtils minioUtils;@PostMapping("upload")@Operation(summary = "上传文件")public Result<Map<String, Object>> upload(@RequestParam(defaultValue = "common") String bucketName,@RequestParam(name = "file", required = false) MultipartFile[] file) {return Result.ok(minioUtils.uploadFile(bucketName, file));}
}

调用上传文件接口后，系统会根据 bucketName 首先判断 bucket 是否存在，不存在则会开始创建，并且设置成公共读写。然后遍历文件数组，对文件重命名，并且记录下上传后的文件访问 url。最后进行文件上传。