您可以尝试这样的事情。
DistinctIterable<String> iterable = mongoClient.getDatabase(dbName).
.getCollection(collectionName, TDocType.class).distinct(NAME_KEY, String.class);
MongoCursor<String> cursor = iterable.iterator();
List<String> list = new ArrayList<>();
while (cursor.hasNext()) {
list.add(cursor.next());
}
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