How to read all the data from an Lucene index?
How to read all the data from a Lucene index?
Document numbers start at 0. You will never get a document marked "deleted" from either IndexReader or IndexSearcher.
IndexReader reader = IndexReader.open(....);
for (int i = 0; i < reader.maxDoc(); i++) {
if (reader.isDeleted(i)) {
continue;
}
Document doc = reader.document(i);
...
}
Hint: if you have an unoptimized index with deleted documents, and you want to retrieve also the content of these deleted documents, call first IndexReader.undeleteAll().
Apache Lucene is a high-performance, full-featured text search engine library written entirely in Java. It is a technology suitable for nearly any application that requires full-text search, especially cross-platform.
Apache Lucene is an open source project available for free download. Please use the links on the left to access Lucene.
补充另一个方法：
TermDocs td = IndexReader.termDocs(null);
然后迭代td