lucene3.0 CRUD实例（二）

/**
	 * 更新索引中的数据
	 */
	public static void updateIndex()
	{
		System.out.println("更新开始==============");
		try
		{
			IndexWriter write = new IndexWriter(dir, new StandardAnalyzer(
					Version.LUCENE_30), true,
					IndexWriter.MaxFieldLength.UNLIMITED);
			
			Document docNew = new Document();
			docNew.add(new Field("id", "123456", Field.Store.YES,
					Field.Index.NOT_ANALYZED));
			docNew.add(new Field("userName", "王五", Field.Store.YES,
					Field.Index.ANALYZED));
			docNew.add(new Field("comefrom", "北京", Field.Store.YES,
					Field.Index.ANALYZED));
			
			Term term = new Term("id", "123456");
			/**
			 * 调用updateDocument的方法，传给它一个新的doc来更新数据， 
			 * Term term = new Term("id","1234567");
			 * 先去索引文件里查找id为1234567的Doc,如果有就更新它(如果有多条，最后更新后只有一条)。如果没有就新增.
			 * 
			 * 数据库更新的时候，我们可以只针对某个列来更新，而lucene只能针对一行数据更新。
			 */
			write.updateDocument(term, docNew);

			write.commit();
			write.close();
			System.out.println("===========成功把张三改成王五===========");
		} 
		catch (Exception e)
		{
			LOGGER.info(e.getMessage());
		}
		System.out.println("更新结束==============\n");
	}

	/**
	 * 查询字符串
	 * @param str
	 */
	public static void search(String str)
	{
		System.out.println("查询开始==============");
		try
		{
			QueryParser queryParser = new QueryParser(Version.LUCENE_30, "userName",   
	                new StandardAnalyzer(Version.LUCENE_30));   
			
			Query query = queryParser.parse(str);
			
			IndexSearcher search = new IndexSearcher(dir); 
			
			TopDocs hits = search.search(query, 20);
			
			/*
			 * 带参数的多个关键字解析
			 * Query q=parser.parse("太阳 月亮");
			 * queryParser.setDefaultOperator(queryParser.AND_OPERATOR);//同时含有多个关键字，如果是QueryParser.OR_OPERATOR表示或者
			*/
			
			if (hits.scoreDocs.length == 0 || hits == null)
			{
				System.out.println(" 没有搜索到'" + str + "' 查询结束\n");
				return;
			}
			
			for (int i = 0; i < hits.scoreDocs.length; i++)
			{
				ScoreDoc sdoc = hits.scoreDocs[i];   
	            Document doc = search.doc(sdoc.doc); 
				
	            System.out.println("own id     = " + doc.get("id"));
				System.out.println("userName   = " + doc.get("userName"));
				System.out.println("come from  = " + doc.get("comefrom"));
			}
		} 
		catch (Exception e)
		{
			LOGGER.info(e.getMessage());
		}
		System.out.println("查询结束==============\n");
	}
}