LuceneSortExplain.java
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上传日期:2022-03-14
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文件大小:3k
- package chapter7;
- import java.io.IOException;
- import org.apache.lucene.analysis.standard.StandardAnalyzer;
- import org.apache.lucene.document.Document;
- import org.apache.lucene.document.Field;
- import org.apache.lucene.index.IndexWriter;
- import org.apache.lucene.queryParser.ParseException;
- import org.apache.lucene.queryParser.QueryParser;
- import org.apache.lucene.search.Hits;
- import org.apache.lucene.search.IndexSearcher;
- import org.apache.lucene.search.Query;
- import org.apache.lucene.search.Sort;
- import org.apache.lucene.store.RAMDirectory;
- import org.apache.lucene.search.*;
- public class LuceneSortExplain {
- static String[] ContentList = { "Lucene 使用 方便", "使用 Lucene","Lucene 功能 强大", "Lucene 开放 源码" };
-
- public static void main(String[] args) throws IOException{
- searchIndex();
- }
- // 创建索引并通过Explain查看结果排序因子
- private static void searchIndex() throws IOException{
- try{
- RAMDirectory ramdirectory = new RAMDirectory();
- IndexWriter writer = new IndexWriter(ramdirectory,new StandardAnalyzer(),true);
- for (int i = 0; i < ContentList.length; i++)
- {
- Document document = new Document();
- Field fieldContent = new Field("Content", ContentList[i], Field.Store.YES, Field.Index.TOKENIZED);
- document.add(fieldContent); // 添加创建的文本域到当前文档
- writer.addDocument(document); // 完成的文档添加到索引
- }
- writer.close(); // 关闭索引
- IndexSearcher searcher = new IndexSearcher(ramdirectory); // 创建检索器
- QueryParser parser = new QueryParser("Content",new StandardAnalyzer()); // 创建查询分析器
- Query query = parser.parse("Lucene"); // 生成查询对象
- Hits rstDoc;
- System.out.println("Lucene相关性排序Explain输出");
- System.out.println("-----------------------------------");
- rstDoc = searcher.search(query); // Lucene默认相关性排序
- for (int i = 0; i < rstDoc.length(); i++) // 遍历获取文档,并读取相关参数
- {
- Document doc = rstDoc.doc(i);
- int id = rstDoc.id( i );
- System.out.println("检索结果 " + i +": " + doc.get("Content") + " Boost: " + doc.getBoost() + ", score : " + rstDoc.score(i));
- Explanation exp = searcher.explain( query, id );
- System.out.println( "排序因子 :" + exp.toString() );
-
- }
- searcher.close();
- } catch(ParseException e){
- System.out.println("ParseException ");
- } catch(IOException e){
- System.out.println("IOException ");
- }
- }
- }