建立好文件索引后，再执行搜索个过程中出现了这个异常：
org.apache.lucene.index.IndexNotFoundException: no segments* file found in org.apache.lucene.store.SimpleFSDirectory@D:\lucene\index01 lockFactory=org.apache.lucene.store.NativeFSLockFactory@26e431: 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 com.lyl.test.HelloLucene.sercher(HelloLucene.java:73) at com.lyl.test.TestLucene.search1(TestLucene.java:19) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597)
单元测试过程中，创建索引读取器IndexReader的时候，抛出异常，并发现索引文件都为0kb，最终确认是索引IndexWriter写入器没有将缓存中的信息输入文件内，
解决方法是：写入器添加好文件索引后，关闭写入器，就ok了！
写道
if(writer !=null) writer.close();
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