lucene删除索引

增加在入门程序创建索引中，增删改用IndexWriter.

1.获取IndexWriter的代码

//public IndexWriter getIndexWriter() throws Exception{// 第一步：创建一个java工程，并导入jar包。// 第二步：创建一个indexwriter对象。Directory directory = FSDirectory.open(new File("E:\\lucene&solr\\index"));// Directory directory = new RAMDirectory();//保存索引到内存中 （内存索引库）Analyzer analyzer = new StandardAnalyzer();// 官方推荐IndexWriterConfig cOnfig= new IndexWriterConfig(Version.LATEST, analyzer);return new IndexWriter(directory, config);}

2.全删除:

1 //全删除
2 @Test
3 public void testAllDelete() throws Exception {
4 IndexWriter indexWriter = getIndexWriter();
5 indexWriter.deleteAll();
6 indexWriter.close();
7 }

 结果:

3.按条件删除

先创建索引:

删除索引

//根据条件删除@Testpublic void testDelete() throws Exception {IndexWriter indexWriter = getIndexWriter();Query query = new TermQuery(new Term("fileName","springmvc"));indexWriter.deleteDocuments(query);indexWriter.close();}

结果:

　　第三个文档被删除，第五个文档被删除。