我可以建议另一种基于自定义结果排序的方法。您可以在答案中阅读它。这个答案有些过时，因此我根据Lucene API 4.10.1修改了此示例。比较器
public abstract class CustomComparator extends FieldComparator<Double> { double[] scoring; double bottom; double topValue; private FieldCache.Ints[] currentReaderValues; private String[] fields; protected abstract double getScore(int[] value); public CustomComparator(int hitNum, String[] fields) { this.fields = fields; scoring = new double[hitNum]; } int[] fromReaders(int doc) { int[] result = new int[currentReaderValues.length]; for (int i = 0; i < result.length; i++) { result[i] = currentReaderValues[i].get(doc); } return result; } @Override public int compare(int slot1, int slot2) { return Double.compare(scoring[slot1], scoring[slot2]); } @Override public void setBottom(int slot) { this.bottom = scoring[slot]; } @Override public void setTopValue(Double top) { topValue = top; } @Override public int compareBottom(int doc) throws IOException { double v2 = getScore(fromReaders(doc)); return Double.compare(bottom, v2); } @Override public int compareTop(int doc) throws IOException { double docValue = getScore(fromReaders(doc)); return Double.compare(topValue, docValue); } @Override public void copy(int slot, int doc) throws IOException { scoring[slot] = getScore(fromReaders(doc)); } @Override public FieldComparator<Double> setNextReader(AtomicReaderContext atomicReaderContext) throws IOException { currentReaderValues = new FieldCache.Ints[fields.length]; for (int i = 0; i < fields.length; i++) { currentReaderValues[i] = FieldCache.DEFAULT.getInts(atomicReaderContext.reader(), fields[i], null, false); } return this; } @Override public Double value(int slot) { return scoring[slot]; }}搜索示例
public class SortExample { public static void main(String[] args) throws IOException { final String[] fields = new String[]{"descriptionLength", "views.views", "nameLength"}; Sort sort = new Sort( new SortField( "", new FieldComparatorSource() { public FieldComparator newComparator(String fieldname, int numHits, int sortPos, boolean reversed) throws IOException { return new CustomComparator(numHits, fields) { @Override protected double getScore(int[] value) { int descriptionLength = value[0]; int views = value[1]; int nameLength = value[2]; return -((descriptionLength > 2000.0 ? 5.0 : 0.0) + (views > 5000.0 ? 3.0 : 0.0) + (nameLength > 20.0 ? 1.0 : 0.0)); } }; } } ) ); IndexWriterConfig indexWriterConfig = new IndexWriterConfig(Version.LUCENE_4_10_4, new StandardAnalyzer()); Directory directory = new RAMDirectory(); IndexWriter indexWriter = new IndexWriter(directory, indexWriterConfig); addDoc(indexWriter, "score 0", 1000, 1000, 10); addDoc(indexWriter, "score 5", 3000, 1000, 10); addDoc(indexWriter, "score 3", 1000, 6000, 10); addDoc(indexWriter, "score 1", 1000, 1000, 30); addDoc(indexWriter, "score 4", 1000, 6000, 30); addDoc(indexWriter, "score 6", 5000, 1000, 30); addDoc(indexWriter, "score 9", 5000, 6000, 30); final IndexReader indexReader = DirectoryReader.open(indexWriter, false); IndexSearcher indexSearcher = new IndexSearcher(indexReader); Query query = new TermQuery(new Term("all", "all")); int nDocs = 100; final TopDocs search = indexSearcher.search(query, null, nDocs, sort); System.out.println("Max " + search.scoreDocs.length + " " + search.getMaxScore()); for (ScoreDoc sd : search.scoreDocs) { document document = indexReader.document(sd.doc); System.out.println(document.getField("name").stringValue()); } } private static void addDoc(IndexWriter indexWriter, String name, int descriptionLength, int views, int nameLength) throws IOException { document doc = new document(); doc.add(new TextField("name", name, Field.Store.YES)); doc.add(new TextField("all", "all", Field.Store.YES)); doc.add(new IntField("descriptionLength", descriptionLength, Field.Store.YES)); doc.add(new IntField("views.views", views, Field.Store.YES)); doc.add(new IntField("nameLength", nameLength, Field.Store.YES)); indexWriter.adddocument(doc); }}代码将输出
score 9score 6score 5score 4score 3score 1score 0
