如何在 Lucene 6 中对数字字段进行排序

我想根据数字字段对搜索结果进行排序。 在下面的示例代码中，我想根据“年龄”字段进行排序。 我从使用以下答案开始：

[如何在 Lucene 6 中对 IntPont 或 LongPoint 字段进行排序 https://stackoverflow.com/questions/38358087/how-to-sort-intpont-or-longpoint-field-in-lucene-6?answertab=votes#tab-top%5D%5B1%5D

但它确实基于 SCORE 进行排序。年龄还没有上升。

And

[Lucene 基于数字字段对搜索结果进行排序 https://stackoverflow.com/questions/21965778/sorting-search-result-in-lucene-based-on-a-numeric-field%5D%5B1%5D

我在搜索功能中将SortField.Type.SCORE更改为SortField.Type.LONG。 但我得到：

字段“年龄”的意外文档值类型为 NONE（预期=NUMERIC）

这是我的代码：

public class TestLongPointSort {


    public static void main(String[] args) throws Exception {

        String indexPath = "/tmp/testSort";
        Analyzer standardAnalyzer = new StandardAnalyzer();
        Directory indexDir = FSDirectory.open(Paths.get(indexPath));
        IndexWriterConfig iwc = new IndexWriterConfig(standardAnalyzer);

        iwc.setOpenMode(IndexWriterConfig.OpenMode.CREATE_OR_APPEND);

        IndexWriter masterIndex = new IndexWriter(indexDir, iwc);

        Document doc = new Document();

        String name = "bob";
        doc.add(new TextField("name", name, Field.Store.YES));
        doc.add(new SortedDocValuesField("name", new BytesRef(name)));
        doc.add(new SortedNumericDocValuesField("age", 20L));
        doc.add(new StoredField("age", 20L));
        long ts = System.currentTimeMillis();
        doc.add(new SortedNumericDocValuesField("ts", ts));
        doc.add(new StoredField("ts", ts));
        masterIndex.addDocument(doc);
        Thread.sleep(1);

        name = "max";
        doc = new Document();
        doc.add(new TextField("name", name, Field.Store.YES));
        doc.add(new SortedDocValuesField("name", new BytesRef(name)));
        doc.add(new SortedNumericDocValuesField("age", 19L));
        doc.add(new StoredField("age", 19L));
        ts = System.currentTimeMillis();
        doc.add(new SortedNumericDocValuesField("ts", ts));
        doc.add(new StoredField("ts", ts));
        masterIndex.addDocument(doc);
        Thread.sleep(1);

        name = "jim";
        doc = new Document();
        doc.add(new TextField("name", name, Field.Store.YES));
        doc.add(new SortedDocValuesField("name", new BytesRef(name)));
        doc.add(new SortedNumericDocValuesField("age", 21L));
        doc.add(new StoredField("age", 21L));
        ts = System.currentTimeMillis();
        doc.add(new SortedNumericDocValuesField("ts", ts));
        doc.add(new StoredField("ts", ts));
        masterIndex.addDocument(doc);

        masterIndex.commit();
        masterIndex.close();

        IndexReader reader = DirectoryReader.open(FSDirectory.open(Paths.get(indexPath)));
        IndexSearcher searcher = new IndexSearcher(reader);

        Analyzer analyzer = new KeywordAnalyzer();
        QueryParser queryParser = new QueryParser("message", analyzer);

        Sort sort;
        TopDocs docs;
        sort = new Sort(new SortField("name", SortField.Type.STRING));
        docs = searcher.search(new MatchAllDocsQuery(), 100, sort);
        System.out.println("Sorted by name");
        for (ScoreDoc scoreDoc : docs.scoreDocs) {
            Document doc2 = searcher.doc(scoreDoc.doc);
            System.out.println("Name:" + doc2.get("name") + " ; age:" + doc2.get("age") + " ; ts:" + doc2.get("ts"));
        }

        //docs = searcher.search(new MatchAllDocsQuery(), 100, new Sort(new SortField("age", SortField.Type.SCORE, true)));
        docs = searcher.search(new MatchAllDocsQuery(), 100, new Sort(new SortField("age", SortField.Type.LONG, true)));
        System.out.println("Sorted by age");
        for (ScoreDoc scoreDoc : docs.scoreDocs) {

            Document doc2 = searcher.doc(scoreDoc.doc);
            System.out.println("Name:" + doc2.get("name") + " ; age:" + doc2.get("age") + " ; ts:" + doc2.get("ts"));
        }

        reader.close();

    }
}

正如我们所看到的，对 STRING 进行排序很好，但我不知道如何对我的数字（长）进行排序。

对数字字段进行排序的正确方法是什么？

Thanks

使用以下方式对搜索结果进行排序SortedNumericDocValuesField，你需要使用SortedNumericSortField https://lucene.apache.org/core/6_4_0/core/org/apache/lucene/search/SortedNumericSortField.html:

Sort sort = new Sort(new SortedNumericSortField("age", SortField.Type.LONG, true));
TopDocs docs = searcher.search(new MatchAllDocsQuery(), 100, sort);