AmazonS3Client：從s3下載損壞的jar文件

Question

我正在嘗試使用AmazonS3Client下載jar文件。但下載後，獲取的jar文件已損壞不會執行。

我使用下面的程序：

String existingBucketName = args[0]; 
    String keyName = "/" + "EMRS3Files-1.0-SNAPSHOT-jar-with-dependencies.jar"; 

    BasicAWSCredentials awsCreds = new BasicAWSCredentials("access-key", "secret-key"); 
    AmazonS3 s3Client = new AmazonS3Client(awsCreds); 

    GetObjectRequest request = new GetObjectRequest(existingBucketName, keyName); 
    S3Object object = s3Client.getObject(request); 
    S3ObjectInputStream objectContent = object.getObjectContent(); 

    IOUtils.copy(objectContent, new FileOutputStream("/tmp/abc.jar")); 

在運行/tmp/abc.jar文件，我得到以下錯誤：

Error: Invalid or corrupt jarfile abc.jar 

Answer 1

以下工作：

GetObjectRequest request = new GetObjectRequest(existingBucketName, keyName); 
    S3Object object = s3Client.getObject(request); 
    S3ObjectInputStream objectContent = object.getObjectContent(); 
    FileOutputStream fos = new FileOutputStream("/tmp/abc.jar"); 

    byte[] buffer = new byte[4096]; 

    int buf = 0; 
    while((buf = objectContent.read(buffer)) > 0) 
    { 
     fos.write(buffer, 0, buf); 
    } 
    fos.close(); 

Answer 2

您是否嘗試過（使用瀏覽器）手動下載，然後運行它？

它可能是亞馬遜S3以某種方式損壞它，而不是你的程序。