lucene3.6.2之自定义评分

两个重要的类：CustomScoreQuery和CustomScoreProvider

两个重要的方法：

1：CustomScoreQuery--CustomScoreProvider getCustomScoreProvider(IndexReader reader)

2：CustomScoreProvider----customScore(int doc, float subQueryScore, float valSrcScore)

自定义查询：

public class MyCustoomScoreQuery extends CustomScoreQuery {

	public MyCustoomScoreQuery(Query subQuery, ValueSourceQuery valSrcQuery) {
		super(subQuery, valSrcQuery);
	}
	
	@Override
	protected CustomScoreProvider getCustomScoreProvider(IndexReader reader)
			throws IOException {
//		return super.getCustomScoreProvider(reader);
		return new MyCustomScoreProvider(reader);
	}
}

自定义评分方式：

public class MyCustomScoreProvider extends CustomScoreProvider {

	public MyCustomScoreProvider(IndexReader reader) {
		super(reader);
		// TODO Auto-generated constructor stub
	}
	
	/*
	 * (non-Javadoc)
	 * @see org.apache.lucene.search.function.CustomScoreProvider#customScore(int, float, float)
	 * @subQueryScore:文档评分
	 * @valSrcScore	 :评分域评分
	 */
	@Override
	public float customScore(int doc, float subQueryScore, float valSrcScore)
			throws IOException {
		// TODO Auto-generated method stub
		//3种方式比较.
	//	return super.customScore(doc, subQueryScore, valSrcScore);
	//	return 1/(subQueryScore*valSrcScore);
		return valSrcScore;
	}

}

索引创建和搜索：

public void createIndex() {
		try {
			directory=FSDirectory.open(new File("D:/lucene/index04"));
			writer=new IndexWriter
				(directory, new IndexWriterConfig(Version.LUCENE_36,new StandardAnalyzer(Version.LUCENE_36)));
			File[] files=new File("D:/src").listFiles();
			Random random=new Random();
			for(int i=0;i<files.length;i++)
			{
				int score=random.nextInt(100);
				File file=files[i];
				Document doc=new Document();
				doc.add(new Field("filename", file.getName(),Store.YES,Index.ANALYZED_NO_NORMS));
				FileInputStream fis=new FileInputStream(file);
				doc.add(new Field("contents", new BufferedReader(new InputStreamReader(fis, "UTF-8"))));
				doc.add(new NumericField("size", Store.YES,true).setLongValue(file.length()));
				doc.add(new NumericField("score", Store.YES, true).setIntValue(score));
				System.out.print(file.length()+" : ");
				System.out.println("lucene crate index"+i+"from"+file.getAbsolutePath() +"| score: "+score);
				writer.addDocument(doc);
				writer.commit();
				fis.close();
			}
			
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally
		{
			if(writer!=null)
			{
				try {
					writer.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				writer=null;
			}
			
			
		}
	}
public void search(String string,Query query)
	{
		try {
			directory=FSDirectory.open(new File("D:/lucene/index04"));
			reader= IndexReader.open(directory);
			searcher=new IndexSearcher(reader);
			
			ScoreDoc[] sds = searcher.search(query,100).scoreDocs;
			System.out.println("找到了"+sds.length+"篇文章");
			for(ScoreDoc doc:sds){
				Document document=searcher.doc(doc.doc);
				System.out.println(document.get("score")+" | "+document.get("filename"));
			}
			searcher.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}  finally
		{
			if(reader!=null)
				try {
					reader.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
		}
	}

测试类：

public class ScoreTest {
	private ScoreUtil scoreUtil=null;
	@Before
	public void beforeTest()
	{
		scoreUtil=new ScoreUtil();
	}
	@Test
	public void createIndexTest()
	{
		scoreUtil.createIndex();
	}
	@Test
	public void searchScoreTest()
	{
		Query query=new TermQuery(new Term("contents","lucene"));
		FieldScoreQuery fieldScoreQuery=new FieldScoreQuery("score", FieldScoreQuery.Type.INT);
		CustomScoreQuery customScoreQuery=new MyCustoomScoreQuery(query,fieldScoreQuery);
		scoreUtil.search("lucene", customScoreQuery);
	}
}

3种方式的结果（按顺序）：

找到了7篇文章
58 | action.txt
45 | shuxue.txt
62 | lucene.txt
75 | jsp.txt
27 | english.txt
22 | struts2.txt
22 | cpp.txt
找到了7篇文章
22 | cpp.txt
22 | struts2.txt
27 | english.txt
75 | jsp.txt
62 | lucene.txt
45 | shuxue.txt
58 | action.txt
找到了7篇文章
75 | jsp.txt
62 | lucene.txt
58 | action.txt
45 | shuxue.txt
27 | english.txt
22 | cpp.txt
22 | struts2.txt