摘自：http://blog.csdn.net/seven_zhao/article/details/42708953

1.基于FunctionQuery，(1)創建類并繼承ValueSource；(2)重寫getValues方法。

1 private class MyScore2 extends ValueSource{ 2 3 @Override 4 public FunctionValues getValues(Map context, 5 final AtomicReaderContext readerContext) throws IOException { 6 return new FloatDocValues(this); } 7 8 @Override 9 public float floatVal(int doc) { 10 float s = 1; 11 //從域緩存中讀取數據 12 // 從域緩存中加載索引字段信息 13 try { 14 Longs longs= FieldCache.DEFAULT.getLongs(readerContext.reader(), "size", false); 15 long size = longs.get(doc); 16 if(size>1000){ 17 s = 0.5f; 18 } 19 } catch (IOException e) { 20 // TODO Auto-generated catch block 21 e.printStackTrace(); 22 } 23 return s; 24 } 25 } 26 }

2.（1）創建類并繼承CustomScoreQuery
? ? (2）覆蓋重寫類中的getCusomScoreProvider方法
? ?（3）創建類并繼承CustomScoreProvider
? ?（4）覆蓋重寫類中的customScore確定新的評分規則

public class MySelfScore {public void searchBySelfScore(){try{IndexSearcher search = new IndexSearcher(DirectoryReader.open(FileIndexUtils.getDirectory()));Query q = new TermQuery(new Term("content","java"));MyCustomScoreQuery myQuery = new MyCustomScoreQuery(q);TopDocs tds = search.search(myQuery, 200);SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");for(ScoreDoc sd:tds.scoreDocs){Document d = search.doc(sd.doc);System.out.println(sd.doc+":("+sd.score+")" +"["+d.get("filename")+"【"+d.get("path")+"】--->"+d.get("size")+"-----"+sdf.format(new Date(Long.valueOf(d.get("date"))))+"]");}System.out.println("-----------Total result:"+tds.scoreDocs.length);}catch(Exception e){e.printStackTrace();}}/***重寫評分的實現方式* **/private class MyScoreProvider extends CustomScoreProvider{private AtomicReaderContext context;public MyScoreProvider(AtomicReaderContext context) {super(context);this.context = context;}/**重寫評分方法，假定需求為文檔size大于1000的評分/1000**/@Overridepublic float customScore(int doc, float subQueryScore, float valSrcScore)throws IOException {// 從域緩存中加載索引字段信息Longs longs= FieldCache.DEFAULT.getLongs(context.reader(), "size", false);/**注冊使用自定義的評分實現方式**///　1. 域值要單一，對于string類型不能分詞(NOT_ANALYZED) //　2. 該域需要建入索引(INDEXED) //　3. 支持的數據類型，byte/short/int/long/float/double// weights.get(doc).utf8ToString();獲取string值BinaryDocValues weights = FieldCache.DEFAULT.getTerms(context.reader(), "title", true);if(weights.get(doc).utf8ToString().equals("1")){System.out.println(doc+" : "+weights.get(doc).utf8ToString());System.out.println(context.reader().document(doc).get("author"));return subQueryScore * valSrcScore*15;}/* * 通過得分相乘放大分數 * 此處可以控制與原有得分結合的方式，加減乘除都可以 * **/return subQueryScore*valSrcScore;}}/*** 重寫CustomScoreQuery 的getCustomScoreProvider方法 * 引用自定義的Provider */private class MyCustomScoreQuery extends CustomScoreQuery{public MyCustomScoreQuery(Query subQuery) {super(subQuery);}@Overrideprotected CustomScoreProvider getCustomScoreProvider(AtomicReaderContext context) throws IOException {return new MyScoreProvider(context);}} }

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轉載于:https://www.cnblogs.com/qingyibusi/p/6170397.html

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