我们能否迭代Amazon S3中的完整对象集 [英] Could we iterate over the complete set of objects in Amazon S3
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问题描述
我尝试打印S3存储桶中所有对象的元数据.但是,它不会返回超过1000个对象的结果.我曾尝试实现 objectListing.isTruncated()
,但它没有帮助.这是我列出超过1000个对象的示例代码.
I have tried to print the metadata of all the objects in S3 bucket. However, it does not return the results of more than 1000 objects. I have tried implementing the objectListing.isTruncated()
and it did not help. Here is a sample code of what I did to list more than 1000 objects.
ListObjectsRequest listObjectsRequest = new ListObjectsRequest()
.withBucketName(bucketName);
ObjectListing objectListing;
do {
objectListing = s3client.listObjects(listObjectsRequest);
for (S3ObjectSummary objectSummary :
objectListing.getObjectSummaries()) {
System.out.println( " - " + objectSummary.getKey() + " " +
"(size = " + objectSummary.getSize() +
")");
listObjectsRequest.setMarker(objectListing.getNextMarker());
}
listObjectsRequest.setMarker(objectListing.getNextMarker());
} while (objectListing.isTruncated());
推荐答案
这解决了我的问题.我已经设置了一个标记并截断了我的列表,并且能够打印所有对象(超过1000个).
This solved my problem. I had setup a marker and truncated my list and was able to print all the objects (more than 1000).
ListObjectsRequest listObjectsRequest = new ListObjectsRequest()
.withBucketName(bucketName);
ObjectListing objectListing;
do {
objectListing = s3.listObjects(listObjectsRequest);
System.out.println("Enter the path where to save yout file");
Scanner scan = new Scanner(System.in);
String path = scan.nextLine();
fileOne = new File(path);
fw = new FileWriter(fileOne.getAbsoluteFile(), true);
bw = new BufferedWriter(fw);
bw.write("Writing data to file");
bw.write("\n");
for (S3ObjectSummary objectSummary: objectListing.getObjectSummaries()) {
String key = objectSummary.getKey();
String dummyKey = key.substring(2);
if (dummyKey.equalsIgnoreCase("somestring")) {
S3Object s3object = s3.getObject(new GetObjectRequest(bucketName, key));
BufferedReader reader = new BufferedReader(new InputStreamReader(s3object.getObjectContent()));
String line;
int i = 0;
while ((line = reader.readLine()) != null) {
if (i > 0) {
bw.append(line + "," + s3object.getKey().substring(0, 2));
bw.append(objectSummary.getLastModified().toString());
bw.newLine();
}
i++;
System.out.println(line);
}
}
// bw.close();
}
listObjectsRequest.setMarker(objectListing.getNextMarker());
} while (objectListing.isTruncated());
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