• 【备忘录】JAVASDK连接MinIO，附完整代码

    MinIO - JavaSDK

    参考资料：

    一、快速开始

    1.1 依赖引入

    
<dependency>
    <groupId>io.miniogroupId>
    <artifactId>minioartifactId>
    <version>8.0.3version>
dependency>

<dependency>
    <groupId>commons-iogroupId>
    <artifactId>commons-ioartifactId>
    <version>2.2version>
dependency>

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    1.2 编写业务层

    package com.p.files.service.impl;

import io.minio.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import java.io.InputStream;

/**
 * @Author zhuhuacong
 * @Date: 2023/10/12/ 14:11
 * @description minIO的基础操作
 */

@Service
public class MinIoBaseService {
    Logger log = LoggerFactory.getLogger(MinIoBaseService.class);

    private final String bucket;
    private final MinioClient minioClient;

    public MinIoBaseService(@Value("${minio.url}") String url,
                        @Value("${minio.access}") String access,
                        @Value("${minio.secret}") String secret,
                        @Value("${minio.bucket}") String bucket) throws Exception {
        this.bucket = bucket;
        minioClient = MinioClient.builder()
                .endpoint(url)
                .credentials(access, secret)
                .build();
        // 初始化Bucket
        initBucket();
    }

    private void initBucket() throws Exception {
        // 应用启动时检测Bucket是否存在
        boolean found = minioClient.bucketExists(BucketExistsArgs.builder().bucket(bucket).build());
        // 如果Bucket不存在，则创建Bucket
        if (!found) {
            minioClient.makeBucket(MakeBucketArgs.builder().bucket(bucket).build());
            log.info("成功创建 Bucket [{}]", bucket);
        }
    }

    /**
     * 上传文件
     *
     * @param is          输入流
     * @param object      对象（文件）名
     * @param contentType 文件类型
     */
    public void putObject(InputStream is, String object, String contentType) throws Exception {
        long start = System.currentTimeMillis();
        minioClient.putObject(PutObjectArgs.builder()
                .bucket(bucket)
                .object(object)
                .contentType(contentType)
                .stream(is, -1, 1024 * 1024 * 10) // 不得小于 5 Mib
                .build());
        log.info("成功上传文件至云端 [{}]，耗时 [{} ms]", object, System.currentTimeMillis() - start);
    }

    /**
     * 获取文件流
     *
     * @param object 对象（文件）名
     * @return 文件流
     */
    public GetObjectResponse getObject(String object) throws Exception {
        long start = System.currentTimeMillis();
        GetObjectResponse response = minioClient.getObject(GetObjectArgs.builder()
                .bucket(bucket)
                .object(object)
                .build());
        log.info("成功获取 Object [{}]，耗时 [{} ms]", object, System.currentTimeMillis() - start);
        return response;
    }

    /**
     * 删除对象（文件）
     *
     * @param object 对象（文件名）
     */
    public void removeObject(String object) throws Exception {
        minioClient.removeObject(RemoveObjectArgs.builder()
                .bucket(bucket)
                .object(object)
                .build());
        log.info("成功删除 Object [{}]", object);
    }
}

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    控制层

    package com.p.files.controller;

import com.p.files.utils.MinIoBaseUtils;
import io.minio.GetObjectResponse;
import io.swagger.annotations.Api;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.UUID;

/**
 * @author RudeCrab
 */
@RestController
@Api(tags = {"minIO文件服务"})
@RequestMapping("/min-io")
public class MinIoFileController {
    @Autowired
    private MinIoBaseUtils minioService;

    @PostMapping
    public String upload(MultipartFile file) throws Exception {
        // 获取文件后缀名
        String extension = FilenameUtils.getExtension(file.getOriginalFilename());
        // 为了避免文件名重复，使用UUID重命名文件，将横杠去掉
        String fileName = UUID.randomUUID().toString().replace("-", "") + "." + extension;
        // 上传
        minioService.putObject(file.getInputStream(), fileName, file.getContentType());
        // 返回文件名
        return fileName;
    }

    @GetMapping("{fileName}")
    public void download(HttpServletRequest request, HttpServletResponse response, @PathVariable("fileName") String fileName) throws Exception  {
        // 设置响应类型
        response.setCharacterEncoding(request.getCharacterEncoding());
        response.setContentType("application/octet-stream");
        response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
        // 获取文件流
        GetObjectResponse objectResponse = minioService.getObject(fileName);
        // 将文件流输出到响应流
        IOUtils.copy(objectResponse, response.getOutputStream());
        // 结束
        response.flushBuffer();
        objectResponse.close();
    }

    @DeleteMapping("{fileName}")
    public String remove(@PathVariable("fileName") String fileName) throws Exception  {
        minioService.removeObject(fileName);
        return "success";
    }
}


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    1.3 配置信息

    # ---------- MinIO系统 ---------
minio:
  # 服务器地址
  url: http://
  # 账号
  access: A
  # 密码
  secret: T
  # Bucket
  bucket: 

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    1.4 功能总结

    基于上述的demo实现了几个功能

    • 连接minio（额外配置
    • 检测bucket存在，并且创建bucket
    • 文件上传（putObject方法
    • 文件下载（getObject方法

    二、整合完整功能版

    package com.p.files.utils;


import io.minio.*;
import io.minio.errors.MinioException;
import io.minio.http.Method;
import io.minio.messages.Bucket;
import io.minio.messages.DeleteError;
import io.minio.messages.DeleteObject;
import io.minio.messages.Item;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

/**
 * @Author zhuhuacong
 * @Date: 2023/10/12/ 14:11
 * @description minIO的基础操作,
 */

@Service
@Slf4j
public class MinIoBaseUtils {
    private final String bucket;
    private final MinioClient minioClient;

    public MinIoBaseUtils(@Value("${minio.url}") String url,
                          @Value("${minio.access}") String access,
                          @Value("${minio.secret}") String secret,
                          @Value("${minio.bucket}") String bucket) throws Exception {
        this.bucket = bucket;
        minioClient = MinioClient.builder()
                .endpoint(url)
                .credentials(access, secret)
                .build();
        // 初始化Bucket
        initBucket();
        log.info("成功连接上minio.URL:{} ,bucket {}", url, bucket);
    }

    private void initBucket() throws Exception {
        // 应用启动时检测Bucket是否存在
        boolean found = this.doesBucketExist(bucket);
        // 如果Bucket不存在，则创建Bucket
        if (!found) {
            minioClient.makeBucket(MakeBucketArgs.builder().bucket(bucket).build());
            log.info("成功创建 Bucket [{}]", bucket);
        }
    }

    /* ------------------------------------> 快速启动  <------------------------------------------------ */
    /**
     * 上传文件
     *
     * @param is          输入流
     * @param object      对象（文件）名
     * @param contentType 文件类型
     */
    public void putObject(InputStream is, String object, String contentType) throws Exception {
        long start = System.currentTimeMillis();
        minioClient.putObject(PutObjectArgs.builder()
                .bucket(bucket)
                .object(object)
                .contentType(contentType)
                .stream(is, -1, 1024 * 1024 * 10) // 不得小于 5 Mib
                .build());
        log.info("成功上传文件至云端 [{}]，耗时 [{} ms]", object, System.currentTimeMillis() - start);
    }

    /**
     * 获取文件流
     *
     * @param object 对象（文件）名
     * @return 文件流
     */
    public GetObjectResponse getObject(String object) throws Exception {
        long start = System.currentTimeMillis();
        GetObjectResponse response = minioClient.getObject(GetObjectArgs.builder()
                .bucket(bucket)
                .object(object)
                .build());
        log.info("成功获取 Object [{}]，耗时 [{} ms]", object, System.currentTimeMillis() - start);
        return response;
    }

    /**
     * 删除对象（文件）
     *
     * @param object 对象（文件名）
     */
    public void removeObject(String object) throws Exception {
        minioClient.removeObject(RemoveObjectArgs.builder()
                .bucket(bucket)
                .object(object)
                .build());
        log.info("成功删除 Object [{}]", object);
    }
    /* ------------------------------------> 快速启动 end  <------------------------------------------------ */


    /* ------------------------------------> 桶相关的操作  <------------------------------------------------ */

    /**
     * 创建桶
     *
     * @param bucketName bucket名称
     * @throws MinioException minio异常
     */
    public void createBucket(String bucketName) throws MinioException {
        try {
            if (!minioClient.bucketExists(BucketExistsArgs.builder().bucket(bucketName).build())) {
                minioClient.makeBucket(MakeBucketArgs.builder().bucket(bucketName).build());
            }
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("create Bucket error!");
        }
    }

    /**
     * 判断桶是否存在
     *
     * @param bucketName 存储桶
     * @return true：存在
     */
    public boolean doesBucketExist(String bucketName) throws MinioException {
        try {
            return minioClient.bucketExists(BucketExistsArgs.builder().bucket(bucketName).build());
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("does Bucket Exist error!");
        }
    }

    /**
     * 获取桶策略
     *
     * @param bucketName bucket名称
     * @return {@link String}
     * @throws MinioException s3minio异常
     */
    public String getBucketPolicy(String bucketName) throws MinioException {
        try {
            return minioClient.getBucketPolicy(GetBucketPolicyArgs.builder().bucket(bucketName).build());
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("get Bucket Policy error!!");
        }
    }

    /**
     * 获取所有桶
     *
     * @return {@link List}<{@link Bucket}>
     * @throws MinioException s3minio异常
     */
    public List<Bucket> getAllBuckets() throws MinioException {
        try {
            return minioClient.listBuckets();
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("get All Buckets error");
        }
    }

    /**
     * 获取桶信息
     *
     * @param bucketName bucket名称
     * @return {@link Optional}<{@link Bucket}>
     * @throws MinioException s3minio异常
     */
    public Optional<Bucket> getBucketInfo(String bucketName) throws MinioException {
        try {
            return getAllBuckets().stream().filter(b -> b.name().equals(bucketName)).findFirst();
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("get Buckets Info error");
        }
    }

    /**
     * 删除桶
     *
     * @param bucketName bucket名称
     * @throws MinioException s3minio异常
     */
    public void removeBucket(String bucketName) throws MinioException {
        try {
            minioClient.removeBucket(RemoveBucketArgs.builder().bucket(bucketName).build());
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("remove Bucket error!!");
        }
    }


    /* ------------------------------------> 桶相关的操作 end <------------------------------------------------ */


    /* ------------------------------------> 文件管理相关 start  <------------------------------------------------ */


    /**
     * 判断文件夹是否存在
     *
     * @param bucketName 存储桶
     * @param folderName 文件夹名称（去掉/）
     * @return true：存在
     */
    public boolean folderExist(String bucketName, String folderName) throws MinioException {
        boolean exist = false;
        try {
            Iterable<Result<Item>> results = minioClient.listObjects(
                    ListObjectsArgs.builder().bucket(bucketName).prefix(folderName).recursive(false).build());
            for (Result<Item> result : results) {
                Item item = result.get();
                if (item.isDir() && folderName.equals(item.objectName())) {
                    exist = true;
                }
            }
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("folderExist error!");
        }
        return exist;
    }

    /**
     * 判断对象是否存在
     *
     * @param bucketName bucket名称
     * @param objectName 对象名称
     * @return boolean
     */
    public boolean objectExist(String bucketName, String objectName) {
        boolean exist = true;
        try {
            minioClient.statObject(StatObjectArgs.builder().bucket(bucketName).object(objectName).build());
        } catch (Exception e) {
            exist = false;
        }
        return exist;
    }





    /**
     * 获取文件外链
     *
     * @param bucketName bucket名称
     * @param objectName 对象名称
     * @param expires    过期时间 秒
     * @return {@link String}
     * @throws MinioException s3minio异常
     */
    public String getObjectUrl(String bucketName, String objectName, Integer expires) throws MinioException {
        try {
            return minioClient.getPresignedObjectUrl(GetPresignedObjectUrlArgs
                    .builder().bucket(bucketName).object(objectName).expiry(expires).method(Method.GET).build());
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("获取文件外链异常");
        }
    }

    /**
     * 获取文件外链（1天过期
     *
     * @param bucketName bucket名称
     * @param objectName 对象名称
     * @return {@link String}
     * @throws MinioException s3minio异常
     */
    public String getObjectUrl(String bucketName, String objectName) throws MinioException {
        try {
            return minioClient.getPresignedObjectUrl(GetPresignedObjectUrlArgs
                    .builder().bucket(bucketName).object(objectName).expiry(24 * 60 * 60).method(Method.GET).build());
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("获取文件外链异常");
        }
    }


    /**
     * 获取对象
     *
     * @param bucketName bucket名称
     * @param objectName 对象名称
     * @return {@link GetObjectResponse} 文件流
     * @throws MinioException s3minio异常
     */
    public GetObjectResponse getObject(String bucketName, String objectName) throws MinioException {
        try {
            return minioClient.getObject(GetObjectArgs.builder()
                    .bucket(bucketName)
                    .object(objectName)
                    .build());
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("获取对象异常");
        }
    }

    /**
     * 获取对象信息
     *
     * @param bucketName bucket名称
     * @param objectName 对象名称
     * @return {@link StatObjectResponse}
     * @throws MinioException s3minio异常
     */
    public StatObjectResponse getObjectInfo(String bucketName, String objectName) throws MinioException {
        try {
            return minioClient.statObject(
                    StatObjectArgs.builder().bucket(bucketName).object(objectName).build());
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("获取对象信息异常");
        }
    }


    /**
     * 获取对象 （断点下载）
     *
     * @param bucketName bucket名称
     * @param objectName 对象名称
     * @param offset     起始字节位置
     * @param length     读取长度
     * @return {@link GetObjectResponse}
     * @throws Exception 异常
     */
    public GetObjectResponse getObject(String bucketName, String objectName, long offset, long length) throws MinioException {
        try {
            return minioClient.getObject(
                    GetObjectArgs.builder().bucket(bucketName).object(objectName).offset(offset).length(length).build());
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("断点下载异常");
        }
    }

    /**
     * 通过MultipartFile上传文件
     *
     * @param bucketName 存储桶
     * @param file       文件
     * @param objectName 对象名
     */
    public ObjectWriteResponse putObject(String bucketName, MultipartFile file, String objectName, String contentType) throws MinioException {
        try (InputStream inputStream = file.getInputStream()) {
            return minioClient.putObject(
                    PutObjectArgs.builder().bucket(bucketName).object(objectName).contentType(contentType)
                            .stream(inputStream, inputStream.available(), -1).build());
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("文件上传异常");
        }
    }

    /**
     * 上传本地文件
     *
     * @param bucketName 存储桶
     * @param objectName 对象名称
     * @param fileName   本地文件路径
     */
    public ObjectWriteResponse putObject(String bucketName, String objectName, String fileName) throws MinioException {
        try {
            return minioClient.uploadObject(UploadObjectArgs.builder()
                    .bucket(bucketName).object(objectName).filename(fileName).build());
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("上传本地文件异常");
        }
    }

    /**
     * 通过流上传文件
     *
     * @param bucketName  存储桶
     * @param objectName  文件对象
     * @param inputStream 文件流
     */
    public ObjectWriteResponse putObjectByStream(String bucketName, String objectName, InputStream inputStream) throws MinioException {
        try {
            return minioClient.putObject(
                    PutObjectArgs.builder().bucket(bucketName).object(objectName).stream(inputStream, inputStream.available(), -1)
                            .build());
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("通过流上传文件异常");
        }
    }

    /**
     * 创建文件夹或目录
     *
     * @param bucketName 存储桶
     * @param objectName 目录路径
     */
    public ObjectWriteResponse createFolder(String bucketName, String objectName) throws MinioException {
        try {
            return minioClient.putObject(
                    PutObjectArgs.builder().bucket(bucketName).object(objectName).stream(
                                    new ByteArrayInputStream(new byte[]{}), 0, -1)
                            .build());
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("文件夹创建异常");
        }
    }

    /**
     * 拷贝文件
     *
     * @param bucketName    存储桶
     * @param objectName    文件名
     * @param srcBucketName 目标存储桶
     * @param srcObjectName 目标文件名
     */
    public ObjectWriteResponse copyObject(String bucketName, String objectName, String srcBucketName, String srcObjectName) throws MinioException {
        try {
            return minioClient.copyObject(
                    CopyObjectArgs.builder()
                            .source(CopySource.builder().bucket(bucketName).object(objectName).build())
                            .bucket(srcBucketName)
                            .object(srcObjectName)
                            .build());
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("拷贝文件 异常");
        }
    }

    /**
     * 删除文件
     *
     * @param bucketName 存储桶
     * @param objectName 文件名称
     */
    public void removeObject(String bucketName, String objectName) throws MinioException {
        try {
            minioClient.removeObject(
                    RemoveObjectArgs.builder()
                            .bucket(bucketName)
                            .object(objectName)
                            .build());
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("删除文件 异常");
        }
    }


    /**
     * 批量删除对象
     *
     * @param bucketName  bucket名称
     * @param objectsName 对象名字
     * @return {@link Iterable}<{@link Result}<{@link DeleteError}>>
     * @throws MinioException s3minio异常
     */
    public Iterable<Result<DeleteError>> removeObjects(String bucketName, List<String> objectsName) throws MinioException {
        try {
            Iterable<Result<DeleteError>> results = minioClient.removeObjects(RemoveObjectsArgs.builder().bucket(bucketName)
                    .objects(objectsName.stream().map(DeleteObject::new).collect(Collectors.toList())).build());
            return results;
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("批量删除对象 异常");
        }
    }

    /**
     * 批量删除对象2
     *
     * @param bucketName  bucket名称
     * @param objectName 对象名字
     * @return {@link Iterable}<{@link Result}<{@link DeleteError}>>
     * @throws MinioException s3minio异常
     */
    public Iterable<Result<DeleteError>> removeObjects(String bucketName, String... objectName) throws MinioException {
        try {
            Iterable<Result<DeleteError>> results = minioClient.removeObjects(RemoveObjectsArgs.builder().bucket(bucketName)
                    .objects(Arrays.stream(objectName).map(DeleteObject::new).collect(Collectors.toList())).build());
            return results;
        } catch (Exception e) {
            log.error("minio 异常 {} " ,e );
            throw new MinioException("批量删除对象 异常");
        }
    }

}

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  • 原文地址：https://blog.csdn.net/Xcong_Zhu/article/details/133806327