如何用Java代码实现同时将文件上传至阿里云OSS存储服务，并本地桌面保存一份副本？

在Java中，要同时将文件上传到阿里云OSS（Object Storage Service）并本地备份，你需要使用阿里云的SDK以及处理文件I/O操作。这里是一个简单的示例，使用了Aliyun SDK for Java：

首先，确保你已经添加了阿里云OSS SDK依赖。如果你还没有，可以去Maven仓库下载。

import com.aliyuncs.IAcsClient;
import com.aliyuncs.OSSClientBuilder;
import com.aliyuncs.exceptions.ClientException;
import com.aliyuncs.exceptions.ServerException;
import java.io.File;

public class FileUploader {
    private static final String ACCESS_KEY_ID = "your_access_key_id";
    private static final String ACCESS_KEY_SECRET = "your_access_key_secret";
    private static final String ENDPOINT = "http://oss-cn-hangzhou.aliyuncs.com"; // 替换为你实际的OSS Endpoint
    private static final String BUCKET_NAME = "your_bucket_name";

    public void uploadAndBackupFile(String localFilePath) {
        IAcsClient iAcsClient = new OSSClientBuilder().build(ACCESS_KEY_ID, ACCESS_KEY_SECRET, ENDPOINT);
        
        try {
            // 上传到OSS
            String objectName = "backup/" + new File(localFilePath).getName(); // 假设备份文件夹名是"backup"
            ossUpload(iAcsClient, localFilePath, objectName);

            // 本地备份
            backupFileToLocal(localFilePath, "local_backup/" + new File(localFilePath).getName());
            
            System.out.println("文件已成功上传到阿里云OSS并本地备份完成.");
        } catch (ClientException e) {
            e.printStackTrace();
        } catch (ServerException e) {
            e.printStackTrace();
        } finally {
            if (iAcsClient != null) {
                iAcsClient.shutdown();
            }
        }
    }

    private void ossUpload(IAcsClient client, String localFilePath, String objectName) throws ClientException, ServerException {
        ossClient.putObject(objectName, new FileInputStream(localFilePath), localFilePath.length());
    }

    private void backupFileToLocal(String localFilePath, String destinationPath) {
        File localBackup = new File(destinationPath);
        try {
            Files.copy(new File(localFilePath).toPath(), localBackup.toPath());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}