Hi guys,
As the topic,it seems that the length of filed does not affect the doc score
accurately for chinese analyzer in my source code
index source code
private static Directory DIRECTORY;
@BeforeClass
public static void before() throws IOException {
DIRECTORY = new RAMDirectory();
Analyzer chineseanalyzer = new
SmartChineseAnalyzer(Version.LUCENE_40);
IndexWriterConfig indexWriterConfig = new
IndexWriterConfig(Version.LUCENE_40,chineseanalyzer);
FieldType nameType = new FieldType();
nameType.setIndexed(true);
nameType.setStored(true);
nameType.setOmitNorms(false);
try {
IndexWriter indexWriter = new IndexWriter(DIRECTORY,
indexWriterConfig);
List<String> nameList = new ArrayList<String>();
nameList.add("咨询公司");nameList.add("飞鹰咨询管理咨询公司");nameList.add("北京中标咨询公司");nameList.add("重庆咨询公司");nameList.add("商务咨询服务公司");nameList.add("法律咨询公司");
for (int i = 0; i < nameList.size(); i++) {
Document document = new Document();
document.add(new Field("name", nameList.get(i),
nameType));
document.add(new
Field("id",String.valueOf(i+1),nameType));
indexWriter.addDocument(document);
}
indexWriter.commit();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
search snippet:
@Test
public void testChinese() throws IOException, ParseException {
String keyword = "咨询公司";
System.out.println("Searching for:" + keyword);
System.out.println();
IndexReader indexReader = DirectoryReader.open(DIRECTORY);
IndexSearcher indexSearcher = new IndexSearcher(indexReader);
Query query = null;
query = new QueryParser(Version.LUCENE_40,"name",new
SmartChineseAnalyzer(Version.LUCENE_40)).parse(keyword);
TopDocs topDocs = indexSearcher.search(query,15);
System.out.println("Search Result:");
if (null !=topDocs && 0 < topDocs.totalHits) {
for (ScoreDoc scoreDoc : topDocs.scoreDocs) {
System.out.println("doc id:" +
indexSearcher.doc(scoreDoc.doc).get("id"));
String name = indexSearcher.doc(scoreDoc.doc).get("name");
System.out.println("content of Field:" + name);
dumpCNTokens(name);
System.out.println("score:" + scoreDoc.score);
System.out.println("-------------------------------------------");
}
} else {
System.out.println("no results");
}
}
And search result as follows:
Searching for:咨询公司
Search Result:
doc id:1
content of Field:咨询公司
Terms:咨询 公司
score:0.74763227
-------------------------------------------
doc id:2
content of Field:飞鹰咨询管理咨询公司
Terms:飞鹰 咨询 管理 咨询 公司
score:0.6317303
-------------------------------------------
doc id:3
content of Field:北京中标咨询公司
Terms:北京 中标 咨询 公司
score:0.5981058
-------------------------------------------
doc id:4
content of Field:重庆咨询公司
Terms:重庆 咨询 公司
score:0.5981058
-------------------------------------------
doc id:5
content of Field:商务咨询服务公司
Terms:商务 咨询 服务 公司
score:0.5981058
-------------------------------------------
doc id:6
content of Field:法律咨询公司
Terms:法律 咨询 公司
score:0.5981058
-------------------------------------------
docs:3,4,5,6 have the same score, but I think the doc 4 and doc 6 should
have a higner score than the doc 3,5, becase the doc 4 and doc 6 have three
terms ,doc 3,5 have four terms.
Am I right? who can give me a explanation? And how to get the expected
result?
--
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