Lucene 3.6.2入门:高级搜索之自定义评分

来源:转载


public class AdvancedSearchByScore { private Directory directory; private IndexReader reader; public AdvancedSearchByScore(){ /**文件大小*/ int[] sizes = {90, 10, 20, 10, 60, 50}; /**文件名*/ String[] names = {"Michael.java", "Scofield.ini", "Tbag.txt", "Jack", "Jade", "Jadyer"}; /**文件内容*/ String[] contents = {"my java blog is http://blog.csdn.net/jadyer", "my Java Website is http://www.jadyer.cn", "my name is jadyer", "I am a Java Developer", "I am from Haerbin", "I like java of Lucene"}; IndexWriter writer = null; Document doc = null; try { directory = FSDirectory.open(new File("myExample/01_index/")); writer = new IndexWriter(directory, new IndexWriterConfig(Version.LUCENE_36, new StandardAnalyzer(Version.LUCENE_36))); writer.deleteAll(); for(int i=0; i<sizes.length; i++){ doc = new Document(); doc.add(new NumericField("size", Field.Store.YES, true).setIntValue(sizes[i])); doc.add(new Field("name", names[i], Field.Store.YES, Field.Index.ANALYZED_NO_NORMS)); doc.add(new Field("content", contents[i], Field.Store.NO, Field.Index.ANALYZED)); //添加一个评分域,专门在自定义评分时使用 //此时默认为Field.Store.NO和Field.Index.ANALYZED_NO_NORMS doc.add(new NumericField("fileScore").setIntValue(new Random().nextInt(600))); writer.addDocument(doc); } } catch (Exception e) { e.printStackTrace(); } finally { if(null != writer){ try { writer.close(); } catch (IOException ce) { ce.printStackTrace(); } } } } /** * 获取IndexReader实例 */ private IndexReader getIndexReader(){ try { if(reader == null){ reader = IndexReader.open(directory); }else{ //if the index was changed since the provided reader was opened, open and return a new reader; else,return null //如果当前reader在打开期间index发生改变,则打开并返回一个新的IndexReader,否则返回null IndexReader ir = IndexReader.openIfChanged(reader); if(ir != null){ reader.close(); //关闭原reader reader = ir; //赋予新reader } } return reader; }catch(Exception e) { e.printStackTrace(); } return null; //发生异常则返回null } /** * 自定义评分搜索 */ public void searchByCustomScoreQuery(){ IndexSearcher searcher = new IndexSearcher(this.getIndexReader()); // //创建一个评分域 // FieldScoreQuery fsq = new FieldScoreQuery("fileScore", FieldScoreQuery.Type.INT); // //创建自定义的CustomScoreQuery对象 // Query query = new MyCustomScoreQuery(new TermQuery(new Term("content", "java")), fsq); Query query = new MyNameScoreQuery(new TermQuery(new Term("content", "java"))); try { TopDocs tds = searcher.search(query, 10); for(ScoreDoc sd : tds.scoreDocs){ Document doc = searcher.doc(sd.doc); System.out.print("文档编号=" + sd.doc + " 文档权值=" + doc.getBoost() + " 文档评分=" + sd.score + " "); System.out.println("size=" + doc.get("size") + " name=" + doc.get("name")); } } catch (CorruptIndexException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if(searcher != null){ try { searcher.close(); } catch (IOException e) { e.printStackTrace(); } } } } /** * 测试一下评分效果 */ public static void main(String[] args) { new AdvancedSearchByScore().searchByCustomScoreQuery(); } }



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