Integrating MinIO Object Storage with Spring Boot: Configuration, Code Samples, and API Endpoints

MinIO is an open‑source object storage service compatible with Amazon S3, suitable for storing large unstructured data such as images, videos, logs, backups, and container images.

The article explains how to install MinIO on Windows (link provided) and how to add the required Maven dependencies (Lombok, Spring Boot starter web, and the MinIO Java client) in pom.xml.

Configuration properties are set in application.properties to define the maximum file size and the MinIO connection parameters (URL, access key, secret key, bucket name).

A StorageProperty class annotated with Lombok @Data, @Component and @ConfigurationProperties holds these settings.

The MinioClientConfig class creates a singleton MinioClient instance, provides utility methods to check bucket existence, list all buckets, and initialise the client in a @PostConstruct method.

The MinIoController exposes REST endpoints for uploading, previewing, downloading and deleting files, delegating the actual operations to a MinioUtil helper.

Finally, the article shows screenshots of successful file upload, download and deletion on the MinIO console.