1.在项目中添加 Minio 的依赖，在使用 Minio 之前，需要在项目中添加 Minio 的依赖。可以在 Maven 的 pom.xml 文件中添加以下依赖：

<dependency><groupId>io.minio</groupId><artifactId>minio</artifactId><version>7.0.2</version>
</dependency>

2.在项目的配置文件中，添加minio服务器相关信息，这里使用的是application.yml文件：

minio:host: http://mini0.dl.cn:9000url: ${minio.host}/${minio.bucket}/access-key: ***   #minio服务器上的access-keysecret-key: ***   #minio服务器上的secret-keybucket: ***  #需要使用的桶的名称

3.在项目中编写一个名为 MinioConfig.java 的配置类，用于加载 application.yml文件中的minio配置信息，并初始化 Minio 的客户端，使用 Minio 客户端进行相关操作，例如上传文件、下载文件、删除文件等。

@Component
public class MinioConfig implements InitializingBean {@Value(value = "${minio.bucket}")private String bucket;@Value(value = "${minio.host}")private String host;@Value(value = "${minio.url}")private String url;@Value(value = "${minio.access-key}")private String accessKey;@Value(value = "${minio.secret-key}")private String secretKey;private MinioClient minioClient;@Overridepublic void afterPropertiesSet() throws Exception {Assert.hasText(url, "Minio url 为空");Assert.hasText(accessKey, "Minio accessKey为空");Assert.hasText(secretKey, "Minio secretKey为空");this.minioClient = new MinioClient(this.host, this.accessKey, this.secretKey);}/*** 上传*/public String putObject(MultipartFile multipartFile) throws Exception {// bucket 不存在，创建if (!minioClient.bucketExists(this.bucket)) {minioClient.makeBucket(this.bucket);}try (InputStream inputStream = multipartFile.getInputStream()) {// 上传文件的名称String fileName = multipartFile.getOriginalFilename();// PutObjectOptions，上传配置(文件大小，内存中文件分片大小)PutObjectOptions putObjectOptions = new PutObjectOptions(multipartFile.getSize(), PutObjectOptions.MIN_MULTIPART_SIZE);// 文件的ContentTypeputObjectOptions.setContentType(multipartFile.getContentType());minioClient.putObject(this.bucket, fileName, inputStream, putObjectOptions);// 返回访问路径return this.url + UriUtils.encode(fileName, StandardCharsets.UTF_8);}}/*** 文件下载*/public void download(String fileName, HttpServletResponse response){// 从链接中得到文件名InputStream inputStream;try {MinioClient minioClient = new MinioClient(host, accessKey, secretKey);ObjectStat stat = minioClient.statObject(bucket, fileName);System.out.println("stat = " + stat);inputStream = minioClient.getObject(bucket, fileName);response.setContentType(stat.contentType());response.setCharacterEncoding("UTF-8");response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));IOUtils.copy(inputStream, response.getOutputStream());inputStream.close();} catch (Exception e){e.printStackTrace();System.out.println("有异常：" + e);}}/*** 列出所有存储桶名称** @return* @throws Exception*/public List<String> listBucketNames()throws Exception {List<Bucket> bucketList = listBuckets();List<String> bucketListName = new ArrayList<>();for (Bucket bucket : bucketList) {bucketListName.add(bucket.name());}return bucketListName;}/*** 查看所有桶** @return* @throws Exception*/public List<Bucket> listBuckets()throws Exception {return minioClient.listBuckets();}/*** 检查存储桶是否存在** @param bucketName* @return* @throws Exception*/public boolean bucketExists(String bucketName) throws Exception {boolean flag = minioClient.bucketExists(bucketName);if (flag) {return true;}return false;}/*** 创建存储桶** @param bucketName* @return* @throws Exception*/public boolean makeBucket(String bucketName)throws Exception {boolean flag = bucketExists(bucketName);if (!flag) {minioClient.makeBucket(bucketName);return true;} else {return false;}}/*** 删除桶** @param bucketName* @return* @throws Exception*/public boolean removeBucket(String bucketName)throws Exception {boolean flag = bucketExists(bucketName);if (flag) {Iterable<Result<Item>> myObjects = listObjects(bucketName);for (Result<Item> result : myObjects) {Item item = result.get();// 有对象文件，则删除失败if (item.size() > 0) {return false;}}// 删除存储桶，注意，只有存储桶为空时才能删除成功。minioClient.removeBucket(bucketName);flag = bucketExists(bucketName);if (!flag) {return true;}}return false;}/*** 列出存储桶中的所有对象** @param bucketName 存储桶名称* @return* @throws Exception*/public Iterable<Result<Item>> listObjects(String bucketName) throws Exception {boolean flag = bucketExists(bucketName);if (flag) {return minioClient.listObjects(bucketName);}return null;}/*** 列出存储桶中的所有对象名称** @param bucketName 存储桶名称* @return* @throws Exception*/public List<String> listObjectNames(String bucketName) throws Exception {List<String> listObjectNames = new ArrayList<>();boolean flag = bucketExists(bucketName);if (flag) {Iterable<Result<Item>> myObjects = listObjects(bucketName);for (Result<Item> result : myObjects) {Item item = result.get();listObjectNames.add(item.objectName());}}return listObjectNames;}/*** 删除一个对象** @param bucketName 存储桶名称* @param objectName 存储桶里的对象名称* @throws Exception*/public boolean removeObject(String bucketName, String objectName) throws Exception {boolean flag = bucketExists(bucketName);if (flag) {List<String> objectList = listObjectNames(bucketName);for (String s : objectList) {if(s.equals(objectName)){minioClient.removeObject(bucketName, objectName);return true;}}}return false;}/*** 文件访问路径** @param bucketName 存储桶名称* @param objectName 存储桶里的对象名称* @return* @throws Exception*/public String getObjectUrl(String bucketName, String objectName) throws Exception {boolean flag = bucketExists(bucketName);String url = "";if (flag) {url = minioClient.getObjectUrl(bucketName, objectName);}return url;}}

4.创建MinioController.java类，处理文件上传，下载，桶创建，删除等操作。

RestController
@RequestMapping("minio")
@Slf4j
public class MinioController {@AutowiredMinioConfig minioConfig;// 上传@PostMapping("/upload")public Object upload(@RequestParam("file") MultipartFile multipartFile) throws Exception {return this.minioConfig.putObject(multipartFile);}//下载@GetMapping("/download")public void download(@RequestParam("fileName")String fileName, HttpServletResponse response) {  this.minioConfig.download(fileName,response);}// 列出所有存储桶名称@PostMapping("/list")public List<String> list() throws Exception {return this.minioConfig.listBucketNames();}// 创建存储桶@PostMapping("/createBucket")public boolean createBucket(String bucketName) throws Exception {return this.minioConfig.makeBucket(bucketName);}// 删除存储桶@PostMapping("/deleteBucket")public boolean deleteBucket(String bucketName) throws Exception {return this.minioConfig.removeBucket(bucketName);}// 列出存储桶中的所有对象名称@PostMapping("/listObjectNames")public List<String> listObjectNames(String bucketName) throws Exception {return this.minioConfig.listObjectNames(bucketName);}// 删除一个对象@PostMapping("/removeObject")public boolean removeObject(String bucketName, String objectName) throws Exception {return this.minioConfig.removeObject(bucketName, objectName);}// 文件访问路径@PostMapping("/getObjectUrl")public String getObjectUrl(String bucketName, String objectName) throws Exception {return this.minioConfig.getObjectUrl(bucketName, objectName);}
}

5.测试