对象存储MinIO（实现文件上传、读取、下载、删除）

一、 MinIO

        MinIO 是一个基于Apache License v2.0开源协议的对象存储服务。它兼容亚马逊S3云存储服

务接口，非常适合于存储大容量非结构化的数据，例如图片、视频、日志文件、备份数据和容器/

虚拟机镜像等，而一个对象文件可以是任意大小，从几kb到最大5T不等。

        MinIO是一个非常轻量的服务,可以很简单的和其他应用的结合，类似 NodeJS, Redis 或者

MySQL。

二、 MinIO安装和启动

       由于MinIO是一个单独的服务器，需要单独部署，有关MinIO在Windows系统上的使用请查看

以下博客。

window10安装minio_angelasp的博客-CSDN博客_win10 安装minio

三、 pom.xml（maven依赖文件）

<!-- SpringBoot Web容器 -->
<dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
       <groupId>io.minio</groupId>
       <artifactId>minio</artifactId>
       <version>8.3.4</version>
</dependency>

 四、 applicatin.properties（配置文件）

# 设置单个文件大小
spring.servlet.multipart.max-file-size= 50MB
#minio文件服务器配置
s3.url=http://localhost:9000
s3.a***essKey=admin
s3.secretKey=admin123
s3.bucketName=test

五、 编写java业务类

minio涉及到的方法有：判断存储桶是否存在，创建存储桶，上传文件，读取文件、下载文件，删

除文件等操作

1、StorageProperty 存储属性类：

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.***ponent;
 
 
@Data
@***ponent
@ConfigurationProperties(prefix = "s3")
public class StorageProperty {
    private String url;
    private String a***essKey;
    private String secretKey;
//    private long callTimeOut = 60000;
//    private long readTimeOut = 300000;
}

2、minio配置类： 

import io.minio.BucketExistsArgs;
import io.minio.MinioClient;
import io.minio.messages.Bucket;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.***ponent;
 
import javax.annotation.PostConstruct;
import java.util.List;
 

@Slf4j
@***ponent
@Configuration
public class MinioClientConfig {
 
    @Autowired
    private StorageProperty storageProperty;
 
    private static MinioClient minioClient;
 
 
    /**
     * @description: 获取minioClient
     * @date 2021/6/22 16:55
     * @return io.minio.MinioClient
     */
    public static MinioClient getMinioClient(){
        return minioClient;
    }
 
    /**
     * 判断 bucket是否存在
     *
     * @param bucketName:
     *            桶名
     * @return: boolean
     * @date : 2020/8/16 20:53
     */
    @SneakyThrows(Exception.class)
    public static boolean bucketExists(String bucketName) {
        return minioClient.bucketExists(BucketExistsArgs.builder().bucket(bucketName).build());
    }
 
 
    /**
     * 获取全部bucket
     *
     * @param :
     * @return: java.util.List<io.minio.messages.Bucket>
     * @date : 2020/8/16 23:28
     */
    @SneakyThrows(Exception.class)
    public static List<Bucket> getAllBuckets() {
        return minioClient.listBuckets();
    }
 
    /**
     * 初始化minio配置
     *
     * @param :
     * @return: void
     * @date : 2020/8/16 20:56
     */
    @PostConstruct
    public void init() {
        try {
            minioClient = MinioClient.builder()
                    .endpoint(storageProperty.getUrl())
                    .credentials(storageProperty.getA***essKey(), storageProperty.getSecretKey())
                    .build();
        } catch (Exception e) {
            e.printStackTrace();
            log.error("初始化minio配置异常: 【{}】", e.fillInStackTrace());
        }
    }
 
}

3、minio工具类 

import io.minio.*;
 
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.***ponent;
import org.springframework.web.multipart.MultipartFile;
 
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.Map;
 

@Slf4j
@***ponent
public class MinioUtil {
    
    /**
     * Minio文件上传
     *
     * @param file       文件实体
     * @param fileName   修饰过的文件名 非源文件名
     * @param bucketName 所存文件夹（桶名）
     * @return
     */
    public ResultEntity<Map<String, Object>> minioUpload(MultipartFile file, String fileName, String bucketName) {
        ResultEntity<Map<String, Object>> resultEntity = new ResultEntity();
        try {
            MinioClient minioClient = MinioClientConfig.getMinioClient();
            // fileName为空，说明要使用源文件名上传
            if (fileName == null) {
                fileName = file.getOriginalFilename();
                fileName = fileName.replaceAll(" ", "_");
            }
            InputStream inputStream = file.getInputStream();
            PutObjectArgs objectArgs = PutObjectArgs.builder().bucket(bucketName).object(fileName)
                    .stream(inputStream, file.getSize(), -1).contentType(file.getContentType()).build();
            //文件名称相同会覆盖
            minioClient.putObject(objectArgs);
            return resultEntity;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
 
 
    /**
     * 检查存储桶是否存在
     *
     * @param bucketName 存储桶名称
     * @return
     */
    public boolean bucketExists(String bucketName) {
        boolean flag = false;
        try {
            flag = MinioClientConfig.bucketExists(bucketName);
            if (flag) {
                return true;
            }
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return false;
    }
 
    /**
     * 获取文件流
     *
     * @param fileName   文件名
     * @param bucketName 桶名（文件夹）
     * @return
     */
    public InputStream getFileInputStream(String fileName, String bucketName) {
        try {
            MinioClient minioClient = MinioClientConfig.getMinioClient();
            return minioClient.getObject(GetObjectArgs.builder().bucket(bucketName).object(fileName).build());
        } catch (Exception e) {
            e.printStackTrace();
            log.error(e.getMessage());
        }
        return null;
    }
 
 
    /**
     * @param bucketName:
     * @author
     * @description: 创建桶
     * @date 2022/8/16 14:36
     */
    public void createBucketName(String bucketName) {
        try {
            if (StringUtils.isBlank(bucketName)) {
                return;
            }
            MinioClient minioClient = MinioClientConfig.getMinioClient();
            boolean isExist = MinioClientConfig.bucketExists(bucketName);
            if (isExist) {
                log.info("Bucket {} already exists.", bucketName);
            } else {
                minioClient.makeBucket(MakeBucketArgs.builder().bucket(bucketName).build());
            }
        } catch (Exception e) {
            e.printStackTrace();
            log.error(e.getMessage());
        }
    }
    /**
     * 下载文件
     *
     * @param originalName 文件路径
     */
    public InputStream downloadFile(String bucketName, String originalName, HttpServletResponse response) {
        try {
            MinioClient minioClient = MinioClientConfig.getMinioClient();
            InputStream file = minioClient.getObject(GetObjectArgs.builder().bucket(bucketName).object(originalName).build());
            String filename = new String(originalName.getBytes("ISO8859-1"), StandardCharsets.UTF_8);
            if (StringUtils.isNotBlank(originalName)) {
                filename = originalName;
            }
            response.setHeader("Content-Disposition", "attachment;filename=" + filename);
            ServletOutputStream servletOutputStream = response.getOutputStream();
            int len;
            byte[] buffer = new byte[1024];
            while ((len = file.read(buffer)) > 0) {
                servletOutputStream.write(buffer, 0, len);
            }
            servletOutputStream.flush();
            file.close();
            servletOutputStream.close();
            return file;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
 
    /**
     * @param bucketName:
     * @description: 删除桶
     * @date 2022/8/16 14:36
     */
    public void deleteBucketName(String bucketName) {
        try {
            if (StringUtils.isBlank(bucketName)) {
                return;
            }
            MinioClient minioClient = MinioClientConfig.getMinioClient();
            boolean isExist = MinioClientConfig.bucketExists(bucketName);
            if (isExist) {
                minioClient.removeBucket(RemoveBucketArgs.builder().bucket(bucketName).build());
            }
        } catch (Exception e) {
            e.printStackTrace();
            log.error(e.getMessage());
        }
    }
    /**
     * @param bucketName:
     * @description: 删除桶下面所有文件
     * @date 2022/8/16 14:36
     */
    public void deleteBucketFile(String bucketName) {
        try {
            if (StringUtils.isBlank(bucketName)) {
                return;
            }
            MinioClient minioClient = MinioClientConfig.getMinioClient();
            boolean isExist = minioClient.bucketExists(BucketExistsArgs.builder().bucket(bucketName).build());
            if (isExist) {
                minioClient.deleteBucketEncryption(DeleteBucketEncryptionArgs.builder().bucket(bucketName).build());
            }
        } catch (Exception e) {
            e.printStackTrace();
            log.error(e.getMessage());
        }
    }
 
    /**
     * 根据文件路径得到预览文件绝对地址
     *
     * @param bucketName
     * @param fileName
     * @return
     */
    public String getPreviewFileUrl(String bucketName, String fileName) {
        try {
            MinioClient minioClient = MinioClientConfig.getMinioClient();
            return minioClient.getPresignedObjectUrl(GetPresignedObjectUrlArgs.builder().bucket(bucketName).object(fileName).build());
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }
}

 六、 MinIoController

文件上传、文件读取、文件下载、文件删除接口如下：

@RestController
@RequestMapping("/minio")
public class MinIoController extends BaseController {
 
    MinioUtil minioUtil = new MinioUtil();
 
    /**
     * 上传文件
     * @param file
     * @return
     */
    @PostMapping("/uploadFile")
    public AjaxResult uploadFile(@RequestBody MultipartFile file) {
        MinioClient minioClient = MinioClientConfig.getMinioClient();
        if (minioClient == null) {
            return AjaxResult.error("连接MinIO服务器失败", null);
        }
        ResultEntity<Map<String, Object>> result = minioUtil.minioUpload(file, "", "data-enpower");
        if (result.getCode() == 0) {
            return AjaxResult.su***ess("上传成功");
        } else {
            return AjaxResult.error("上传错误！！！");
        }
    }
 
    /**
     * 获取文件预览地址
     * @param fileName
     * @return
     */
    @RequestMapping("/getRedFile")
    public AjaxResult getRedFile(@RequestBody String fileName) {
        MinioClient minioClient = MinioClientConfig.getMinioClient();
        if (minioClient == null) {
            return AjaxResult.error("连接MinIO服务器失败", null);
        }
        String url = minioUtil.getPreviewFileUrl("data-enpower",fileName);
        return AjaxResult.su***ess(url);
    }
 
    /**
     * 下载文件
     * @param fileName
     * @param response
     * @return
     */
    @RequestMapping("/downloadFile")
    public String downloadFile(@RequestParam String fileName, HttpServletResponse response) {
        MinioClient minioClient = MinioClientConfig.getMinioClient();
        if (minioClient == null) {
            return "连接MinIO服务器失败";
        }
        return minioUtil.downloadFile("data-enpower",fileName,response) != null ? "下载成功" : "下载失败";
    }
 
    /**
     * 删除文件
     *
     * @param fileName 文件路径
     * @return
     */
    @PostMapping("/deleteFile")
    public String deleteFile(String fileName) {
        MinioClient minioClient = MinioClientConfig.getMinioClient();
        if (minioClient == null) {
            return "连接MinIO服务器失败";
        }
        boolean flag = minioUtil.deleteFile("data-enpower",fileName);
        return flag == true ? "删除成功" : "删除失败";
    }
 
 
}

对象存储MinIO基本用法

对象存储服务MinIO的基本用法 

https://www.***blogs.***/hackyle/p/minio-demo.html