IndexSearch中增量索引使用reopen

public IndexSearcher newIndexSearcher() {
		try {
			if(null==isearcher){
	        	isearcher = new IndexSearcher(IndexReader.open("D:/Index"));
	        }else{
				IndexReader indexReader=isearcher.getIndexReader();//获取当前的indexReader
				if(!indexReader.isCurrent()){//判断是否有索引更新
				 
			// 如果有索引更新,先关闭当前的indexSearcher
					closeIndexSearcher();
//利用indexReader.reopen()获取新的indexReader,并作为IndexSearcher的参数创建一个新的indexSearcher
					
					isearcher=new IndexSearcher(indexReader.reopen());
				}
	        }
		
			return isearcher;
		} catch (CorruptIndexException e) {
			//e.printStackTrace();
			return null;
		} catch (IOException e) {
			//e.printStackTrace();
			return null;
		}
	}