对于任何文档,termFreqVector始终为null。我确定文档在集合中并且该字段存在。那么问题出在哪里呢?
for(int i = 0; i <reader.numDocs(); i ++){
TermFreqVector tfv = reader.getTermFreqVector(i,“ tags”);
谢谢
您确定要使用索引字段Field.TermVector.YES
吗?这是一个工作示例:
Directory directory = new RAMDirectory();
Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_30);
MaxFieldLength mlf = MaxFieldLength.UNLIMITED;
IndexWriter writer = new IndexWriter(directory, analyzer, true, mlf);
Document doc = new Document();
doc.add(new Field("tags", "foo bar", Field.Store.NO,
Field.Index.ANALYZED, Field.TermVector.YES));
writer.addDocument(doc);
writer.close();
IndexReader reader = IndexReader.open(directory);
for (int i = 0; i < reader.numDocs(); i++) {
TermFreqVector tfv = reader.getTermFreqVector(i, "tags");
System.out.println(tfv);
}
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