如何用java缩短s3的前缀url？

import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.GeneratePresignedUrlRequest;
import com.amazonaws.services.s3.model.ResponseHeaderOverrides;

import java.net.URL;
import java.util.Date;

public class S3URLShortener {
    public static void main(String[] args) {
        // 创建AmazonS3Client对象
        AmazonS3 s3Client = AmazonS3ClientBuilder.defaultClient();

        // 设置存储桶名称和对象键
        String bucketName = "your-bucket-name";
        String objectKey = "your-object-key";

        // 设置URL过期时间（可选）
        Date expiration = new Date(System.currentTimeMillis() + 3600000); // 1小时后过期

        // 生成缩短的URL
        GeneratePresignedUrlRequest generatePresignedUrlRequest =
                new GeneratePresignedUrlRequest(bucketName, objectKey)
                        .withExpiration(expiration);

        URL url = s3Client.generatePresignedUrl(generatePresignedUrlRequest);

        System.out.println("缩短的URL: " + url.toString());
    }
}