SpringBoot整合MinIO实现文件上传下载

1 引入依赖

<dependency>
    <groupId>io.miniogroupId>
    <artifactId>minioartifactId>
    <version>8.4.3version>
dependency>

<dependency>
    <groupId>com.squareup.okhttp3groupId>
    <artifactId>okhttpartifactId>
    <version>${okhttp3.client.version}version>
dependency>

<dependency>
    <groupId>com.squareup.okiogroupId>
    <artifactId>okioartifactId>
    <version>${okio.client.version}version>
dependency>

2 编写配置文件和配置类

application.yaml

spring:
  # 配置文件上传大小限制
  servlet:
    multipart:
    #单个文件最大限制
      max-file-size: 50MB
    # 最大运行上传总大小
      max-request-size: 100MB
 
# minio 参数配置
minio:
  endpoint: http://localhost:1024
  accessKey: minioadmin
  secretKey: minioadmin

配置类

@Configuration
public class MinIoClientConfig {
 
    @Value("${minio.endpoint}")
    private String endpoint;
    @Value("${minio.accessKey}")
    private String accessKey;
    @Value("${minio.secretKey}")
    private String secretKey;
 
    /**
     * 注入minio 客户端
     * @return
     */
    @Bean
    public MinioClient minioClient(){
    return MinioClient.builder()
                        .endpoint(endpoint)
                        .credentials(accessKey, secretKey)
                        .build();
    }
}

3 创建工具类操作Minio

MinioUtil

package unicom.cloud.medical.util;

import cn.hutool.core.date.DateUtil;
import cn.hutool.core.io.FastByteArrayOutputStream;
import cn.hutool.core.util.StrUtil;
import com.alibaba.nacos.common.utils.UuidUtils;
import io.minio.*;
import io.minio.http.Method;
import io.minio.messages.Bucket;
import io.minio.messages.Item;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.DependsOn;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;

import javax.annotation.Resource;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

@DependsOn("minioConfig")
@Component
@Slf4j
public class MinioUtil {
    @Resource
    private MinioClient minioClient;



    /**
     * 查看存储bucket是否存在
     * @return boolean
     */
    public Boolean bucketExists(String bucketName) {
        Boolean found;
        try {
            found = minioClient.bucketExists(BucketExistsArgs.builder().bucket(bucketName).build());
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return found;
    }

    /**
     * 创建存储bucket
     * @return Boolean
     */
    public Boolean makeBucket(String bucketName) {
        try {
            minioClient.makeBucket(MakeBucketArgs.builder()
                    .bucket(bucketName)
                    .build());
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }
    /**
     * 删除存储bucket
     * @return Boolean
     */
    public Boolean removeBucket(String bucketName) {
        try {
            minioClient.removeBucket(RemoveBucketArgs.builder()
                    .bucket(bucketName)
                    .build());
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }
    /**
     * 获取全部bucket
     */
    public List<Bucket> getAllBuckets() {
        try {
            List<Bucket> buckets = minioClient.listBuckets();
            return buckets;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }



    /**
     * 文件上传
     *
     * @param file 文件
     * @return Boolean
     */
    public String upload(MultipartFile file,String bucketName) {
        String originalFilename = file.getOriginalFilename();
        if (StrUtil.isBlank(originalFilename)){
            throw new RuntimeException();
        }
        String fileName = UuidUtils.generateUuid() + originalFilename.substring(originalFilename.lastIndexOf("."));
        String objectName = DateUtil.format(new Date(),"yyyy-MM/dd") + "/" + fileName;
        try {
            PutObjectArgs objectArgs = PutObjectArgs.builder().bucket(bucketName).object(objectName)
                    .stream(file.getInputStream(), file.getSize(), -1).contentType(file.getContentType()).build();
            //文件名称相同会覆盖
            minioClient.putObject(objectArgs);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        return objectName;
    }

    /**
     * 预览图片
     * @param fileName
     * @return
     */
    public String preview(String bucketName,String fileName){
        // 查看文件地址
        GetPresignedObjectUrlArgs build = new GetPresignedObjectUrlArgs().builder().bucket(bucketName).object(fileName).method(Method.GET).build();
        try {
            String url = minioClient.getPresignedObjectUrl(build);
            return url;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 文件下载
     * @param fileName 文件路径 (上传时返回的路径)
     * @param res response
     * @return Boolean
     */
    public void download(String bucketName,String fileName, HttpServletResponse res) {
        GetObjectArgs objectArgs = GetObjectArgs.builder().bucket(bucketName)
                .object(fileName).build();
        try (GetObjectResponse response = minioClient.getObject(objectArgs)){
            byte[] buf = new byte[1024];
            int len;
            try (FastByteArrayOutputStream os = new FastByteArrayOutputStream()){
                while ((len=response.read(buf))!=-1){
                    os.write(buf,0,len);
                }
                os.flush();
                byte[] bytes = os.toByteArray();
                res.setCharacterEncoding("utf-8");
                // 设置强制下载不打开
                // res.setContentType("application/force-download");
                res.addHeader("Content-Disposition", "attachment;fileName=" + fileName);
                try (ServletOutputStream stream = res.getOutputStream()){
                    stream.write(bytes);
                    stream.flush();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 查看文件对象
     * @return 存储bucket内文件对象信息
     */
    public List<Item> listObjects(String bucketName) {
        Iterable<Result<Item>> results = minioClient.listObjects(
                ListObjectsArgs.builder().bucket(bucketName).build());
        List<Item> items = new ArrayList<>();
        try {
            for (Result<Item> result : results) {
                items.add(result.get());
            }
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        return items;
    }

    /**
     * 删除
     * @param fileName
     * @return
     * @throws Exception
     */
    public boolean remove(String bucketName,String fileName){
        try {
            minioClient.removeObject( RemoveObjectArgs.builder().bucket(bucketName).object(fileName).build());
        }catch (Exception e){
            return false;
        }
        return true;
    }



}

4 文件上传和下载

@PostMapping("/upload")
public List<String> orc(@RequestPart MultipartFile[] file) {

    Validator.validateTrue(file !=null && file.length>0,"文件有误，请重新上传");
    //上传并返回上传地址
    return Arrays.stream(file).map(f -> minioUtil.upload(f, bucketName)).collect(Collectors.toList());
}


/**
 * 前端根据返回路径下载文件
*/
@GetMapping("/resource/**")
public void downloadResource(HttpServletRequest request,HttpServletResponse response){
    //解析文件路径
    String path = (String) request.getAttribute(HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE);
    String filePath = path.replaceAll("/ocr/resource","");
    //调用minio下载
    minioUtil.download(bucketName,filePath,response);
}