一、初步认识lucene

环境搭建：

1、lucene-core-3.5.0.jar

2、mmseg4j-all-1.8.5-with-dic.jar（中文分词器）

3、lucene-highlighter-3.5.0.jar、lucene-memory-3.5.0.jar（高亮显示）

 

在全文索引工具中，都是由这样的三部分组成
  1、索引部分(I am a boy)
  2、分词部分
  3、搜索部分

 

    /**


	 * 建立索引


	 */


	public void index() {


		


		//1、创建Directory


		//Directory directory = new RAMDirectory();//建立在内存中


		Directory directory = null;


		try {


			directory = FSDirectory.open(new File("D:/test/index01"));


		} catch (IOException e1) {


			e1.printStackTrace();


		}


		//2、创建IndexWriter


		IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_36, new StandardAnalyzer(


			Version.LUCENE_36));


		IndexWriter writer = null;


		


		try {


			writer = new IndexWriter(directory, config);


			


			//3、创建Document对象


			Document document = null;


			//4、为Document添加Field


			Collection files = FileUtils.listFiles(new File("D:/test/lucene"),


				FileFileFilter.FILE, null);


			for (File file : files) {


				document = new Document();


				document.add(new Field("content", new FileReader(file)));


				document.add(new Field("filename", file.getName(), Field.Store.YES,


					Field.Index.NOT_ANALYZED));


				document.add(new Field("path", file.getAbsolutePath(), Field.Store.YES,


					Field.Index.NOT_ANALYZED));//是否存储路径，是否进行分词


				


				writer.addDocument(document);


			}


			


			//5、通过IndexWriter添加对象到索引中


		} catch (CorruptIndexException e) {


			e.printStackTrace();


		} catch (LockObtainFailedException e) {


			e.printStackTrace();


		} catch (IOException e) {


			e.printStackTrace();


		} finally {


			if (writer != null) {


				try {


					writer.close();


				} catch (CorruptIndexException e) {


					e.printStackTrace();


				} catch (IOException e) {


					e.printStackTrace();


				}


			}


		}


		


	}


	


	/**


	 * 搜索


	 */


	public void searcher() {


		


		try {


			//1、创建Directory


			Directory directory = FSDirectory.open(new File("D:/test/index01"));


			//2、创建IndexReader


			IndexReader reader = IndexReader.open(directory);


			//3、根据IndexReader创建IndexSearcher


			IndexSearcher searcher = new IndexSearcher(reader);


			//4、创建搜索的Query


			QueryParser parser = new QueryParser(Version.LUCENE_36, "content",


				new StandardAnalyzer(Version.LUCENE_36));//content表示搜索的Field


			Query query = parser.parse("File");//表示内容中含有“File”的


			//5、根据searcher搜索并返回TopDocs


			TopDocs topDocs = searcher.search(query, 10);//只搜索10条


			//6、根据TopDocs对象获取ScoreDoc对象


			ScoreDoc[] sds = topDocs.scoreDocs;


			for (ScoreDoc scoreDoc : sds) {


				//7、根据searcher和ScoreDoc对象获取具体的Document对象


				Document document = searcher.doc(scoreDoc.doc);


				//8、根据Document对象获取需要的值


				System.out.println(document.get("filename"));


				System.out.println(document.get("path"));


			}


			


			//9、关闭reader


			reader.clone();


		} catch (Exception e) {


			e.printStackTrace();


		}


	}