lucene 索引出错 no segments* file found in org.apache.lucene.store.MMapDirectory

创建第一个lucene索引后，搜索出错：

org.apache.lucene.index.IndexNotFoundException: no segments* file found in org.apache.lucene.store.MMapDirectory@H:\lucene lockFactory=org.apache.lucene.store.NativeFSLockFactory@487c9b46: files: [write.lock, _0.fdt, _0.fdx]

at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:712)
at org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:75)
at org.apache.lucene.index.IndexReader.open(IndexReader.java:462)
at org.apache.lucene.index.IndexReader.open(IndexReader.java:308)
at lucene.Searcher.search(Searcher.java:26)

at lucene.Searcher.main(Searcher.java:49)

原因：

indexer创建完索引后没有关闭（提交）导致索引没有完整创建，导致搜索报错

注意如下说明：（index.close()）

public static void main(String[] args) {
		long start = System.currentTimeMillis();
		Indexer indexer = null;
		int numIndexed = 0;
		try {
			indexer = new Indexer(indexDir);
			numIndexed = indexer.index(dataDir, new TextFilesFilter());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			try {
				//IndexerWriter写索引操作关闭，提交写索引（如没关闭会造成索引无法完整创建，查询时出错）
				indexer.close();
		} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		long end = System.currentTimeMillis();
		System.out.println("\n Indexing " + numIndexed + " files took "
				+ (end - start) + "milliseconds");

	}