1、搭建单机MinIO

（1）配置 docker-compose.yml

minio:
image: minio/minio
container_name: "chain-minio"
ports:
- 9000:9000 # 服务端口
- 9090:9090 # 控制台端口
environment:
- "MINIO_ACCESS_KEY=admin" # 登陆账号
- "MINIO_SECRET_KEY=12345678" # 密码
volumes: # 挂载数据卷
- "/dockerdata/minio/data:/data"
- "/dockerdata/minio/config:/root/.minio"
command: server /data --console-address ":9090" # 容器启动时执行的指令
restart: always # 容器退出时总是重启容器

（2）执行docker-compose.yml

docker-compose up -d

（3）执行过后，在主机访问 控制台

服务器ip:9090

在控制台创建 Bucket。创建账户获取 Key 和 Secret

（4）运用 java sdk

pom.xml 添加依赖：

<!--     minio    -->
<dependency>
    <groupId>io.minio</groupId>
    <artifactId>minio</artifactId>
    <version>8.4.2</version>
</dependency>

application.yml 添加配置：

# minio 配置
minio:
  url: http://192.168.182.135:9000 # 对象存储服务的URL
  accessKey: admin # Access key 账户
  secretKey: 12345678  # Secret key 密码

这里的 accessKey 和 secretKey 可以是登录控制台的账户和密码，也可以是在控制台新增的账户
例如

# minio 配置
minio:
  url: http://192.168.182.135:9000  #对象存储服务的URL
  accessKey: 5JT8GZMHP4P9CP3UIVOJ # Access key账户
  secretKey: ixElQtTEVnn2s+BgkAfE+0LmTDqlZMBrzH1HJ51o # Secret key 密码

添加 Config

@Configuration
public class MinioConfig {
    @Value("${minio.url}")
    private  String url;
    @Value("${minio.accessKey}")
    private String accessKey;
    @Value("${minio.secretKey}")
    private String secretKey;

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

MinioUtil

@Component
public class MinioUtil {
    @Resource
    private MinioClient minioClient;

    /**
     * 创建一个桶
     */
    public void createBucket(String bucket) throws Exception {
        boolean found = minioClient.bucketExists(BucketExistsArgs.builder().bucket(bucket).build());
        if (!found) {
            minioClient.makeBucket(MakeBucketArgs.builder().bucket(bucket).build());
        }
    }

    /**
     * 上传一个文件
     */
    public void uploadFile(InputStream stream, String bucket, String objectName) throws Exception {
        minioClient.putObject(PutObjectArgs.builder().bucket(bucket).object(objectName)
                .stream(stream, -1, 10485760).build());
    }

    /**
     * 列出所有的桶
     */
    public List<String> listBuckets() throws Exception {
        List<Bucket> list = minioClient.listBuckets();
        List<String> names = new ArrayList<>();
        list.forEach(b -> {
            names.add(b.name());
        });
        return names;
    }

    /**
     * 下载一个文件
     */
    public InputStream download(String bucket, String objectName) throws Exception {
        InputStream stream = minioClient.getObject(
                GetObjectArgs.builder().bucket(bucket).object(objectName).build());
        return stream;
    }

    /**
     * 删除一个桶
     */
    public void deleteBucket(String bucket) throws Exception {
        minioClient.removeBucket(RemoveBucketArgs.builder().bucket(bucket).build());
    }

    /**
     * 删除一个对象
     */
    public void deleteObject(String bucket, String objectName) throws Exception {
        minioClient.removeObject(RemoveObjectArgs.builder().bucket(bucket).object(objectName).build());
    }
}

写个 Controller 测试

@Api(tags = "文件操作接口")
@RestController
public class MinioController{
    @Resource
    MinioUtil minioUtil;

    @ApiOperation("上传一个文件")
    @RequestMapping(value = "/uploadfile", method = RequestMethod.POST)
    @ResponseBody
    public Response<Integer> fileupload(@RequestParam MultipartFile uploadfile, @RequestParam String bucket,
                               @RequestParam(required=false) String objectName) throws Exception {
        minioUtil.createBucket(bucket);
        if (objectName != null) {
            minioUtil.uploadFile(uploadfile.getInputStream(), bucket, "/"+uploadfile.getOriginalFilename());
        } else {
            minioUtil.uploadFile(uploadfile.getInputStream(), bucket, uploadfile.getOriginalFilename());
        }
        return ResponseUtils.success(1);
    }

    @ApiOperation("下载一个文件")
    @RequestMapping(value = "/downloadFile", method = RequestMethod.GET)
    @ResponseBody
    public void downloadFile(@RequestParam String bucket, @RequestParam String objectName,
                             HttpServletResponse response) throws Exception {
        InputStream stream = minioUtil.download(bucket, objectName);
        ServletOutputStream output = response.getOutputStream();
        response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(objectName.substring(objectName.lastIndexOf("/") + 1), "UTF-8"));
        response.setContentType("application/octet-stream");
        response.setCharacterEncoding("UTF-8");
        IOUtils.copy(stream, output);
    }
}