使用lucene PrefixQuery 根据拼音前缀查询

PrefixQuery类似于 数据库中的 like 'a%'查询
以下是测试代码，这种方式的缺陷是人为的分出了更多的term，目前还在找有没有更优的方法。
测试代码：

public static String index_path3="D:\\ix3";
	public static void main(String[]args) throws Exception{
		

		//createPrefixIndex();
                //前缀查询
		Query trquery  = new PrefixQuery(new Term("pinyin","ghai" ));   

		IndexReader  indexReader = IndexReader.open(FSDirectory.open(new File(index_path3)));
		
		Searcher  searcher = new IndexSearcher(indexReader);
		
		TopDocs topDocs = searcher.search(trquery,100);
		
		for (ScoreDoc hits:topDocs.scoreDocs){
			Document doc = searcher.doc(hits.doc);
			System.out.println("doc = "+doc.get("hotelName"));
		}
		
	}
	/**
	 * 创建pinyin索引
	 */
	public static void createPrefixIndex(){
		Analyzer  analyzer = new IKAnalyzer();
		PerFieldAnalyzerWrapper  perFieldAnalyzerWrapper = new PerFieldAnalyzerWrapper(analyzer);
		try {
			
			//perFieldAnalyzerWrapper.addAnalyzer("price", new WhitespaceAnalyzer());
			IndexWriter writer = new IndexWriter(FSDirectory.open(new File(index_path3)), perFieldAnalyzerWrapper, true,IndexWriter.MaxFieldLength.LIMITED);
			Document doc  = new Document();
			String pinyin="shanghai";
			
                         int len = pinyin.length();   
			//将拼音截取保存
                        for(int i=0;i<len;i++){   
				String value = pinyin.substring(i,len);   
				doc.add(new Field("pinyin", value, Field.Store.YES, Field.Index.NOT_ANALYZED));
			}
			doc.add(new Field("hotelName", "test2", Field.Store.YES, Field.Index.ANALYZED));

			writer.addDocument(doc);
			
			doc  = new Document();
			doc.add(new Field("hotelName", "test3", Field.Store.YES, Field.Index.ANALYZED));
			pinyin="beijing";
			len = pinyin.length();   
			for(int i=0;i<len;i++){   
				String value = pinyin.substring(i,len);   
				doc.add(new Field("pinyin", value, Field.Store.YES, Field.Index.NOT_ANALYZED));
			}
			writer.addDocument(doc);
			
			doc  = new Document();
			doc.add(new Field("hotelName", "test6", Field.Store.YES, Field.Index.ANALYZED));
			pinyin="zhongguo_benxi";
			len = pinyin.length();   
			for(int i=0;i<len;i++){   
				String value = pinyin.substring(i,len);   
				doc.add(new Field("pinyin", value, Field.Store.YES, Field.Index.NOT_ANALYZED));
			}
			writer.addDocument(doc);
			
			doc  = new Document();
			doc.add(new Field("hotelName", "test1", Field.Store.YES, Field.Index.ANALYZED));
			pinyin="tianjin";
			len = pinyin.length();   
			for(int i=0;i<len;i++){   
				String value = pinyin.substring(i,len);   
				doc.add(new Field("pinyin", value, Field.Store.YES, Field.Index.NOT_ANALYZED));
			}
			writer.addDocument(doc);
			
		
			
			writer.close();
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}