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图像将上载到Amazon S3存储桶.我需要从Amazon服务器获取预签名的URL.我还想设置该URL的到期时间.最多只需17天.但我不能设置最长1年的到期时间.

      Calendar cal = Calendar.getInstance();
        cal.add(Calendar.YEAR, 1);
        Date nextYear = cal.getTime();

    GeneratePresignedUrlRequest generatePresignedUrlRequest = new GeneratePresignedUrlRequest(
                "bucketName", "accessname");
        generatePresignedUrlRequest.setMethod(HttpMethod.GET);
        generatePresignedUrlRequest
                .setExpiration(nextYear);
        URL url = s3client
                .generatePresignedUrl(generatePresignedUrlRequest);
        bucketURL = url.toString();