查找lucene索引中的文档数量

Using Java how would you find out the number of documents in an lucene index?

使用Java如何在lucene索引中找到文档的数量?

4 个解决方案

#1

IndexReader contains the methods you need, in particular, numDocs

IndexReader包含了您需要的方法，特别是numDocs。

http://lucene.apache.org/core/3_6_0/api/all/org/apache/lucene/index/IndexReader.html#numDocs()

http://lucene.apache.org/core/3_6_0/api/all/org/apache/lucene/index/IndexReader.html numDocs()

#2

The official documentation: http://lucene.apache.org/java/2_4_0/api/org/apache/lucene/index/IndexReader.html#numDocs()

官方文档:http://lucene.apache.org/java/2_4_0/api/org/apache/lucene/index/IndexReader.html numDocs()

#3

Using java you can find the number of documents like this :

使用java您可以找到这样的文档数量:

IndexReader reader = IndexReader.open(FSDirectory.open(indexDirectory));
System.out.println(reader.maxDoc()); //this will give ya what you need.

#4

When using Hibernate Search, it is possible to obtain a Lucene IndexReader instance through the Hibernate Search API and then use reader.numDocs() as already mentioned in previous answers.

在使用Hibernate搜索时，可以通过Hibernate搜索API获取Lucene IndexReader实例，然后使用reader.numDocs()。

FullTextEntityManager fullTextEntityManager = org.hibernate.search.jpa.Search.getFullTextEntityManager(get‌​EntityManager());
IndexReader reader = fullTextEntityManager.getSearchFactory().getIndexReaderAcces‌​sor().open(MyEntity1‌​.class, MyEntity2.class ...);
int numDocs = reader.numDocs();