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[英]How to test if a list of objects contains an object that contains a particular string as an attribute?
[英]How to filter(contains particular string) list of key objects (s3) into a new list
我試圖從包含特定字符串的s3的關鍵對象列表中過濾掉。 這是我的方法:
public List<String>getBucketList3(String filterStr) {
List<String> lst = new ArrayList<>();
ListObjectsRequest listObjectsRequest = new ListObjectsRequest()
.withBucketName(bucketName);
ObjectListing objectListing = s3client.listObjects(listObjectsRequest);
for (; ; ) {
List<S3ObjectSummary> summaries = objectListing.getObjectSummaries();
if (summaries.size() < 1) {
break;
}
summaries.forEach(s -> lst.add(s.getKey()));
objectListing = s3client.listNextBatchOfObjects(objectListing);
}
return lst;
}
我試圖僅過濾掉包含'filterStr'的關鍵對象,並將其添加到我的'lst'數組列表字符串中。 我試圖使用java 8的stream()來完成它,但是我正在努力解決它。
List<String> list = lst.stream()
.filter(s -> s.contains(filterStr))
.collect(Collectors.toList());
如果這是適合您的情況的前提條件,它可以像這樣工作。
您可以嘗試如下操作:
ObjectListing objectListing = s3client.listObjects(listObjectsRequest);
List<S3ObjectSummary> summaries = objectListing.getObjectSummaries();
List<String> lst = new ArrayList<>();
do {
lst.addAll(summaries.stream()
.map(S3ObjectSummary::getKey) // creates a string stream
.filter(s -> s.contains(filterStr)) // filters all values containing filterStr
.collect(Collectors.toList()));
objectListing = s3client.listNextBatchOfObjects(objectListing);
summaries = objectListing.getObjectSummaries();
} while (!summaries.isEmpty());
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