/*** Description: 建立索引**/
public void createIndex(){IndexWriter indexWriter = null;try {//1.创建DirectoryDirectory directory = new RAMDirectory();  //在内存中建立索引//2.创建IndexWriterIndexWriterConfig indexWiterConfig = new IndexWriterConfig(Version.LUCENE_36, new StandardAnalyzer(Version.LUCENE_36));indexWriter = new IndexWriter(directory, indexWiterConfig);//3.创建Document对象Document document = new Document();//4.为Document添加FieldFile filePath = new File("luence/example");for(File file: filePath.listFiles()){ //为该文件夹下的所有文件建立索引document = new Document();//传入文件内容document.add(new Field("content",new FileReader(file)));//传入文件名document.add(new Field("filename", file.getName(),Field.Store.YES,Field.Index.NOT_ANALYZED));//传入文件路径document.add(new Field("path",file.getAbsolutePath(),Field.Store.YES,Field.Index.NOT_ANALYZED));//5.通过IndexWriter添加文档到索引中indexWriter.addDocument(document);}} catch (Exception e) {e.printStackTrace();}finally{if(indexWriter!=null){try {indexWriter.close();} catch (Exception e) {e.printStackTrace();}}}}

Directory directory2 = FSDirectory.open(new File("F:/luence/index"));    //在硬盘上的F:/luence/index下建立索引

public  void searcher(){try {//1.创建Directory 在硬盘上的F:/luence/index下建立索引Directory directory = FSDirectory.open(new File("F:/luence/index"));    //2.创建IndexReaderIndexReader indexReader = IndexReader.open(directory);//3.根据IndexReader创建IndexSearcherIndexSearcher indexSearcher = new IndexSearcher(indexReader);//4.创建搜索的Query //创建parser来确定要搜索文件的内容,第二个参数表示搜索的域, 实例中为"content",表示在内容中查找QueryParser queryParser = new QueryParser(Version.LUCENE_36,"content",new StandardAnalyzer(Version.LUCENE_36));//创建query,表示搜索域为content中包含Java关键字的文档Query query = queryParser.parse("Java");    //搜索包含关键字Java的信息//5.根据Searcher搜索并且返回TopDocs            //查询,第二个参数表示显示前10条记录TopDocs topDoc = indexSearcher.search(query, 10);//6.根据TopDocs获取ScoreDoc对象ScoreDoc[] scoreDocs = topDoc.scoreDocs;for(ScoreDoc scoreDoc : scoreDocs){//7.根据Seacher和ScoreDoc对象获取具体的Document对象Document document = indexSearcher.doc(scoreDoc.doc);//8.根据Document对象获取需要的值System.out.println(document.get("filename") + "[" + document.get("path") + "]");}//9.关闭IndexReaderindexReader.close();} catch (Exception e) {// TODO: handle exception}
}

public void delete(){IndexWriter indexWriter = null;try {IndexWriterConfig indexWriterConfig = new IndexWriterConfig(Version.LUCENE_36,new StandardAnalyzer(Version.LUCENE_36));indexWriter = new IndexWriter(directory, indexWriterConfig);//参数是一个选项,可以是一个Query,也可以是一个Term,Term是一个精确查找的值//此时删除的文档并不会完全被删除,而是存储在一个回收站中,可以恢复//使用Reader可以有效的恢复取到的文档数indexWriter.deleteDocuments(new Term("id","1"));} catch (Exception e) {e.printStackTrace();}finally{if(indexWriter!=null){try {indexWriter.close();} catch (Exception e) {e.printStackTrace();}}}}

public void query(){try {IndexReader indexReader = IndexReader.open(directory);System.out.println("存储的文档数:" + indexReader.numDocs());System.out.println("总存储量:" + indexReader.maxDoc());System.out.println("被删除的文档：" + indexReader.numDeletedDocs());} catch (Exception e) {e.printStackTrace();}}

        LuenceIndex luence = new LuenceIndex("F:/luence/index");luence.index();System.out.println("===== 首次建立索引后进行查询 =====");luence.query();luence.delete();System.out.println("===== 调用删除操作后进行查询 =====");luence.query();

===== 首次建立索引后进行查询 =====
存储的文档数:5
总存储量:5
被删除的文档：0
===== 调用删除操作后进行查询 =====
存储的文档数:4
总存储量:5
被删除的文档：1

public void recovery(){try {IndexReader indexReader = IndexReader.open(directory,false);//通过IndexReader进行恢复,恢复时,必须把IndexReader的只读(readOnly)设置为falseindexReader.undeleteAll();indexReader.close();} catch (Exception e) {e.printStackTrace();}}

public void forceDelete(){IndexWriter indexWriter = null;try {IndexWriterConfig indexWriterConfig = new IndexWriterConfig(Version.LUCENE_36,new StandardAnalyzer(Version.LUCENE_36));indexWriter = new IndexWriter(directory, indexWriterConfig);indexWriter.forceMergeDeletes();} catch (Exception e) {e.printStackTrace();}finally{if(indexWriter!=null){try {indexWriter.close();} catch (Exception e2) {e2.printStackTrace();}}}
}

public static void main(String[] args) {LuenceIndex luence = new LuenceIndex("F:/luence/index");luence.index();System.out.println("===== 首次建立索引后进行查询 =====");luence.query();luence.delete();System.out.println("===== 调用删除操作后进行查询 =====");luence.query();luence.forceDelete();System.out.println("===== 清空回收站内容后进行查询 =====");luence.query();
}

===== 首次建立索引后进行查询 =====
存储的文档数:5
总存储量:5
被删除的文档：0
===== 调用删除操作后进行查询 =====
存储的文档数:4
总存储量:5
被删除的文档：1
===== 清空回收站内容后进行查询 =====
存储的文档数:4
总存储量:4
被删除的文档：0

public void update(){IndexWriter indexWriter = null;try {IndexWriterConfig indexWriterConfig = new IndexWriterConfig(Version.LUCENE_36,new StandardAnalyzer(Version.LUCENE_36));indexWriter = new IndexWriter(directory, indexWriterConfig);//Luence并没有提供更新,这里的更新操作其实是先删除再添加的操作合集Document document = new Document();document.add(new Field("id","updateId",Field.Store.YES,Field.Index.NOT_ANALYZED_NO_NORMS));document.add(new Field("email","updateEmail",Field.Store.YES,Field.Index.NOT_ANALYZED));document.add(new Field("content","updateContent",Field.Store.NO,Field.Index.ANALYZED));document.add(new Field("name","updateName",Field.Store.YES,Field.Index.NOT_ANALYZED_NO_NORMS));//更新Id为2的数据indexWriter.updateDocument(new Term("id","2"), document);} catch (Exception e) {e.printStackTrace();}finally{if(indexWriter!=null){try {indexWriter.close();} catch (Exception e) {e.printStackTrace();}}}
}