public void query() {
try {
IndexReader reader = IndexReader.open(directory);
// 通过reader可以有效的获取到文档的数量
System.out.println("numDocs:" + reader.numDocs());
System.out.println("maxDocs:" + reader.maxDoc());
System.out.println("deleteDocs:" + reader.numDeletedDocs());
reader.close();
} catch (CorruptIndexException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
