minio 上传、下载和删除案例

引入maven依赖

<dependency>
    <groupId>io.minio</groupId>
    <artifactId>minio</artifactId>
    <version>8.4.3</version>
</dependency>

文件的上传、下载、删除操作

import io.minio.*;
import io.minio.errors.ErrorResponseException;

import java.io.FileInputStream;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;

public class Main {

    public static void main(String[] args) {

        String fileName = "1715759535550.jpg";
        Path path = Paths.get("E:\\BaiduNetdiskDownload\\minio\\" + fileName);
        String bucketName = "test";
        try (FileInputStream fileInputStream = new FileInputStream(path.toString())) {
            //1.创建minio链接客户端 accessKey: minio账号 secretKey: minio密码  endpoint: 文件上传地址
            MinioClient minioClient = MinioClient.builder().credentials("minioadmin", "minioadmin").endpoint("http://127.0.0.1:9000/").build();
            //2.上传
            PutObjectArgs putObjectArgs = PutObjectArgs.builder()
                    //文件名
                    .object(fileName)
                    //文件类型
                    .contentType("application/vnd.openxmlformats-officedocument.presentationml.presentation")
                    //桶名词  与minio创建的名词一致
                    .bucket(bucketName)
                    //文件流
                    .stream(fileInputStream, fileInputStream.available(), -1)
                    .build();
            minioClient.putObject(putObjectArgs);

            System.out.println("文件上传成功");


//            ======================================================================================
            GetObjectArgs build = GetObjectArgs.builder()
                    .object(fileName)
                    .bucket(bucketName)
                    .build();
            InputStream object = minioClient.getObject(build);

            // 定义本地保存路径
            String localFilePath = "E:\\BaiduNetdiskDownload\\minio\\download\\" + fileName;

            // 使用NIO进行高效文件写入
            Files.copy(object, Paths.get(localFilePath), StandardCopyOption.REPLACE_EXISTING);
            System.out.println("文件下载成功，保存路径：" + localFilePath);

//            ==============================================================================================

            if (!objectExists(minioClient, bucketName, fileName)) {
                System.out.println("文件不存在，无需删除");
                return;
            }
            RemoveObjectArgs removeArgs = RemoveObjectArgs.builder()
                    .bucket(bucketName)
                    .object(fileName)
                    .build();
            minioClient.removeObject(removeArgs);

            if (objectExists(minioClient, bucketName, fileName)) {
                throw new RuntimeException("文件删除失败，仍可检测到对象");
            }
            System.out.println("文件删除成功");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    // 验证对象是否存在
    private static boolean objectExists(MinioClient client, String bucket, String object) {
        try {
            client.statObject(StatObjectArgs.builder()
                    .bucket(bucket)
                    .object(object)
                    .build());
            return true;
        } catch (ErrorResponseException e) {
            if ("NoSuchKey".equals(e.errorResponse().code())) {
                return false;
            }
            throw new RuntimeException("对象状态检查失败", e);
        } catch (Exception e) {
            throw new RuntimeException("对象状态检查异常", e);
        }
    }
}

关闭延迟问题

在执行完上述代码后，会发现程序要过一段时间才会结束。这是因为其 HTTP 连接池未清理​，MinIO 客户端底层使用 OkHttpClient，默认保持连接池存活。可以在 cmd 里面 输入 netstat -aon | findstr 端口，会发现其监听的端口号存在进程。它关闭后程序才是正式结束。

因此我们自定义 OkHttpClient，手动关闭

// 创建自定义 HTTP 客户端
OkHttpClient customHttpClient = new OkHttpClient.Builder()
        .connectionPool(new ConnectionPool(20, 5, TimeUnit.MINUTES))
        .build();
// 构建 MinIO 客户端
MinioClient minioClient = MinioClient.builder()
        .credentials("admin", "winditCMC2020")
        .endpoint("http://10.100.50.217:9002")
        .httpClient(customHttpClient)
        .build();
//===========程序逻辑================
customHttpClient.dispatcher().executorService().shutdown();
customHttpClient.connectionPool().evictAll();

批量下载问题

minio 不能一次性下载多个文件，只能一个文件一个文件下载。想同时下载多个文件，只能使用多线程。比如使用 parallelStream 。

String LOCAL_DIR = "E:\\BaiduNetdiskDownload\\minio\\download\\";
String remotePath = "wpd/1743153330102/25032817153917958/202503/1/0/";
ArrayList<String> fileList = new ArrayList<>();
fileList.add("1743384078223");
fileList.add("1743369669340");
fileList.parallelStream().forEach(dataName -> {
    try {
        Path localPath = Paths.get(LOCAL_DIR + dataName);
        Files.createDirectories(localPath.getParent());

        try (InputStream stream = minioClient.getObject(
                GetObjectArgs.builder()
                        .bucket(bucketName)
                        .object(remotePath + dataName)
                        .build())) {
            Files.copy(stream, localPath);
            System.out.println("下载成功: " + dataName);
        }
    } catch (Exception e) {
        System.err.println("下载失败: " + dataName);
        e.printStackTrace();
    }
});