java OSS 桶下创建文件夹

在Java中操作阿里云OSS（Object Storage Service，对象存储服务）桶并创建子目录，通常会使用阿里云提供的SDK，如`aliyun-sdk-oss`。下面是一个简单的示例，展示如何使用这个SDK在桶下创建文件夹：

首先，你需要初始化OSS客户端，并通过Access Key ID和Access Key Secret获取到连接：

import com.aliyuncs.IAcsClient;
import com.aliyuncs.OSSRequest;
import com.aliyuncs.exceptions.ClientException;
import com.aliyuncs.profile.DefaultProfile;

IAcsClient client = new IAcsClient(new DefaultProfile(
        "<your-region>", // 例如 "cn-hangzhou"
        "<your-access-key-id>",
        "<your-access-key-secret>"));

然后，你可以创建一个新的bucket如果还没创建，或者直接在已有的bucket下创建文件夹：

String bucketName = "<your-bucket-name>";
String folderName = "<folder-to-create>";

// 创建Bucket对象
OSSClient ossClient = client.getOssClient();

try {
    // 判断文件夹是否已经存在
    if (!ossClient.doesObjectExist(bucketName, folderName)) {
        // 如果不存在，则创建文件夹
        PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, folderName, null);
        ossClient.putObject(putObjectRequest);
        System.out.println("Folder " + folderName + " created successfully.");
    } else {
        System.out.println(folderName + " already exists.");
    }
} catch (ClientException e) {
    e.printStackTrace();
} finally {
    ossClient.shutdown();
}