我想知道如何做到这一点。我查看了sdk文档并提供了一些示例,但我很困惑语法通常如何。
如果我想删除文件,我假设我使用deleteObject(path, key)
。但是,什么是“关键”?
另外如何删除目录?我似乎无法找到这样做的方法。
答案 0 :(得分:35)
这段代码适合我。 folderPath类似于“topDir / secondDir /”
void deleteObjectsInFolder(String bucketName, String folderPath) {
for (S3ObjectSummary file : s3.listObjects(bucketName, folderPath).getObjectSummaries()){
s3.deleteObject(bucketName, file.getKey());
}
}
答案 1 :(得分:13)
S3中的“键”类似于文件路径:
http://bucket.s3.amazonaws.com/some/path/to/use
...位于名为bucket
的广告位中,其密钥为some/path/to/use
。
它实际上并不是一条路径,因为没有文件夹。 S3密钥只是一个大目录(整个存储桶)中文件的文件名。 S3键可以包含/
,但除非您设置delimiter
argument with listing a bucket,否则它没有特殊含义。
换句话说,拥有一个名为some/object
的对象并没有告诉你关于对象some
的任何信息(它可能存在也可能不存在 - 两个对象不相关)。
但是,您可以请求具有特定前缀的密钥,因此我可以说“给我所有以some/path/to/
开头的密钥,它将返回some/path/to/use
。它看起来像”列出目录“,但是它实际上只是要求以特定字符串开头的文件。
我可以很容易地命名这样的事情:
somepathtousea
somepathtouseb
并说“以somepathtouse
开头给我一切”(它会说somepathtousea
和somepathtouseb
)。
注意:S3网址来自several forms:
http://s3.amazonaws.com/bucket/key http://bucket.s3.amazonaws.com/key http://bucket/key (where bucket is a DNS CNAME record pointing to bucket.s3.amazonaws.com)
编辑:
我查看了the JavaDocs,这是我看到的函数签名(对于AmazonS3Client
):
public void deleteObject(java.lang.String bucketName,
java.lang.String key)
throws AmazonClientException,
AmazonServiceException
再次编辑:
现在,文件夹确实存在,作为零长度对象,其内容类型为application/x-directory
,关键字以/
结尾:
$ AWS_PROFILE=prod aws s3api head-object --bucket example-bucket --key example-directory/
{
"AcceptRanges": "bytes",
"LastModified": "Mon, 29 Apr 2019 14:59:36 GMT",
"ContentLength": 0,
"ETag": "\"d41d8cd98f00b204e9800998ecf8427e\"",
"ContentType": "application/x-directory",
"ServerSideEncryption": "AES256",
"Metadata": {}
}
这仍然只是惯例,没有什么可以阻止你让文件结束/
或文件夹里面的文件不存在。
答案 2 :(得分:5)
您可能需要查看此example,以获取有关如何从S3删除对象的快速参考。
delete
的语法实际上是
deleteObject( bucketName, key )
其中bucketName是放置文件的存储桶,key是要在存储桶中删除的文件的名称。
将存储桶视为您的硬盘驱动器,如C:\,D:\等。并将键作为要删除的文件的绝对路径名。
答案 3 :(得分:3)
/ *这是适用于我的解决方案。这里Bucket_Name是我在S3上的桶名,key是Bucket_Name下的路径。所以,如果S3上的绝对路径是:
S3:// MY_BUCKET /路径/到/我/文件夹
然后,下面的代码应该有效。 * /
String Bucket_Name = "my_bucket";
String key = "Path/to/my/folder";
ObjectListing objects = s3Client.listObjects(BUCKET_NAME, key);
for (S3ObjectSummary objectSummary : objects.getObjectSummaries())
{
s3Client.deleteObject(BUCKET_NAME, objectSummary.getKey());
}
答案 4 :(得分:2)
适合我,谨防截断!
long start = System.currentTimeMillis();
long totalSize = 0;
int totalItems = 0;
String key ="path/to/folder/"
String bucket = "my-bucket"
final ListObjectsRequest listObjectsRequest = new ListObjectsRequest().withBucketName(bucketName).withPrefix(key);
ObjectListing objects = s3.listObjects(listObjectsRequest);
do {
for (S3ObjectSummary objectSummary : objects.getObjectSummaries()) {
totalSize += objectSummary.getSize();
totalItems++;
s3.deleteObject(bucketName, objectSummary.getKey());
}
objects = s3.listNextBatchOfObjects(objects);
} while (objects.isTruncated());
long stop = System.currentTimeMillis();
LOG.trace("User {} had {} items with {} Kb, took {} ms to delete", user.getName(), totalItems, totalSize / 1024, stop
- start);
答案 5 :(得分:1)
ListObjectsV2Result为我工作。试一次。
private void deleteObjectsInFolder() {
try {
ListObjectsV2Result result;
do {
String folderPath = " ";
result = s3.listObjectsV2(Constants.BUCKET_NAME, folderPath);
Log.e("count:", result.getKeyCount() + "");
if (result.getKeyCount() != 0) {
for (S3ObjectSummary objectSummary :
result.getObjectSummaries()) {
s3.deleteObject(Constants.BUCKET_NAME, objectSummary.getKey());
}
}
System.out.println("Next Continuation Token : " + result.getNextContinuationToken());
} while (result.isTruncated() == true);
} catch (AmazonServiceException ase) {
System.out.println("Caught an AmazonServiceException, " +
"which means your request made it " +
"to Amazon S3, but was rejected with an error response " +
"for some reason.");
System.out.println("Error Message: " + ase.getMessage());
System.out.println("HTTP Status Code: " + ase.getStatusCode());
System.out.println("AWS Error Code: " + ase.getErrorCode());
System.out.println("Error Type: " + ase.getErrorType());
System.out.println("Request ID: " + ase.getRequestId());
} catch (AmazonClientException ace) {
System.out.println("Caught an AmazonClientException, " +
"which means the client encountered " +
"an internal error while trying to communicate" +
" with S3, " +
"such as not being able to access the network.");
System.out.println("Error Message: " + ace.getMessage());
}
}
答案 6 :(得分:1)
按批量删除S3存储桶中的对象列表:
public void deleteObjects(String bucketName, List<String> keys) {
List<KeyVersion> bulk = new ArrayList<>();
for (int i = 0; i < keys.size(); i++) {
bulk.add(new KeyVersion(keys.get(i)));
if (i % 100 == 0) {
try {
s3Client.deleteObjects(new DeleteObjectsRequest(bucketName).withKeys(bulk));
} catch (Exception e) {
System.err.println(e.getErrorMessage());
}
bulk.clear();
}
}
if (bulk.size() > 0) {
try {
s3Client.deleteObjects(new DeleteObjectsRequest(bucketName).withKeys(bulk));
} catch (Exception e) {
System.err.println(e.getErrorMessage());
}
}
}
来源:http://codeflex.co/delete-objects-from-amazon-s3-bucket-using-aws-sdk-for-java/
答案 7 :(得分:0)
由于质疑在亚马逊S3 java中删除文件,目录和存储桶,我想提供删除非空S3存储桶(AWS Reference)的代码:
public void deleteBucket(final String bucketName) {
final AmazonS3 s3 = AmazonS3ClientBuilder.defaultClient();
try {
ObjectListing objectListing = s3.listObjects(bucketName);
while (true) {
for (Iterator<?> iterator = objectListing.getObjectSummaries().iterator(); iterator.hasNext(); ) {
S3ObjectSummary summary = (S3ObjectSummary) iterator.next();
s3.deleteObject(bucketName, summary.getKey());
}
if (objectListing.isTruncated()) {
objectListing = s3.listNextBatchOfObjects(objectListing);
} else {
break;
}
}
VersionListing versionListing = s3.listVersions(new ListVersionsRequest().withBucketName(bucketName));
while (true) {
for (Iterator<?> iterator = versionListing.getVersionSummaries().iterator(); iterator.hasNext(); ) {
S3VersionSummary vs = (S3VersionSummary) iterator.next();
s3.deleteVersion(bucketName, vs.getKey(), vs.getVersionId());
}
if (versionListing.isTruncated()) {
versionListing = s3.listNextBatchOfVersions(versionListing);
} else {
break;
}
}
s3.deleteBucket(bucketName);
} catch (AmazonServiceException e) {
System.err.println(e.getErrorMessage());
}
}
答案 8 :(得分:0)
在我的情况下,此行代码适用于keyName
是文件名:
s3Client.deleteObject(new DeleteObjectRequest(bucketName, keyName));