Lucene的增删改查的操作

@Test
	public void saveIndex() throws Exception
	{
		File file = new File(indexPath);
		FSDirectory dir = FSDirectory.getDirectory(file);
		Document doc = File2DocumentUtils.file2Document(filePath);
		IndexWriter indexWriter = new IndexWriter(dir, analyzer, MaxFieldLength.LIMITED);
		indexWriter.addDocument(doc);
		indexWriter.close();
	}

	@Test
	public void deleteIndex() throws Exception
	{
		IndexWriter indexWriter = new IndexWriter(indexPath, analyzer, MaxFieldLength.LIMITED);
		Term term = new Term("path", filePath);
		indexWriter.deleteDocuments(term);
		indexWriter.close();
	}
	
	@Test
	public void updateIndex() throws Exception
	{
		IndexWriter indexWriter = new IndexWriter(indexPath, analyzer, MaxFieldLength.LIMITED);
		Term term = new Term("path", filePath);
		Document doc = File2DocumentUtils.file2Document(filePath);
		//正直的更新是先删除在添加
		indexWriter.updateDocument(term, doc);
		indexWriter.close();
	}
	@Test
	public void searchIndex() throws Exception
	{
		String queryString = "笑话";

		// 把要搜索的文本解析成Query
		String[] fields = {"name", "content"};
		QueryParser queryParser = new MultiFieldQueryParser(fields, analyzer);
		Query query = queryParser.parse(queryString);

		// 进行查询
		IndexSearcher indexSearcher = new IndexSearcher(indexPath);
		Filter filter = null;
		// 相当于一个List集合
		TopDocs topDocs = indexSearcher.search(query, filter, 10000);

		int firstResult = 0;
		int max = 3;
		int end = Math.min(firstResult+max, topDocs.totalHits);
		
		// 打印结果
		for (int i=firstResult; i<end;i++)
		{
			ScoreDoc scoreDoc = topDocs.scoreDocs[i];
			int docSn = scoreDoc.doc;// 文档内部编号
			Document doc = indexSearcher.doc(docSn); // 根据编号取出相应的文档
			File2DocumentUtils.printDocumentInfo(doc);

		}
		System.out.println("总共有[" + topDocs.totalHits + "]条匹配结果");
	}