BoostFieldQuery.java
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上传日期:2022-03-14
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文件大小:4k
- 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.store.RAMDirectory;
- public class BoostFieldQuery {
- static String[] ContentList = { "Lucene 使用 方便", "Lucene 功能 强大", "Lucene 开放 源码" };
- static String[] NumberList = { "No.1", "No.2", "No.3"};
- public static void main(String[] args) throws IOException{
- searchIndex();
- }
- // 创建索引并修改boost值,改变检索结果排序
- private static void searchIndex() throws IOException{
- try{
- RAMDirectory ramdirectory = new RAMDirectory(); // 内存目录
- IndexWriter writer = new IndexWriter(ramdirectory,new StandardAnalyzer(),true);
- for (int i = 0; i < ContentList.length; i++)
- {
- Document document = new Document(); // 创建文档对象
- // 创建域对象
- Field fieldContent1 = new Field("Content1", ContentList[i], Field.Store.YES, Field.Index.TOKENIZED);
- Field fieldContent2 = new Field("Content2", ContentList[i], Field.Store.YES, Field.Index.TOKENIZED);
- Field fieldNumber = new Field("Number", NumberList[i], Field.Store.YES, Field.Index.TOKENIZED);
- fieldContent1.setBoost((i+1)*2); // 不同域上指定不同Boost值
- fieldContent2.setBoost(1.0f/(i+1));
-
- document.add(fieldContent1); // 添加创建的文本域到当前文档
- document.add(fieldContent2); // 添加创建的内容相同文本域到当前文档
- document.add(fieldNumber);
- 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
- System.out.println("Lucene Search Content1");
- System.out.println("-------------------------------------------");
- QueryParser parser1 = new QueryParser("Content1",new StandardAnalyzer()); // 创建查询分析器
- Query query1 = parser1.parse("Lucene"); // 生成查询对象
- Hits rstDoc1 = searcher.search(query1); // 检索结果保存Hits集合
- for (int i = 0; i < rstDoc1.length(); i++) // 遍历获取文档,并读取相关参数
- {
- Document doc = rstDoc1.doc(i);
- System.out.println(doc.get("Number") + " " + doc.get("Content1") + " Boost: " + doc.getBoost() + ", score : " + rstDoc1.score(i));
- }
- System.out.println("");
- System.out.println("Lucene Search Content2");
- System.out.println("-------------------------------------------");
- QueryParser parser2 = new QueryParser("Content2",new StandardAnalyzer()); // 创建查询分析器
- Query query2 = parser2.parse("Lucene"); // 生成查询对象
- Hits rstDoc2 = searcher.search(query2); // 检索结果保存Hits集合
- for (int i = 0; i < rstDoc2.length(); i++) // 遍历获取文档,并读取相关参数
- {
- Document doc = rstDoc2.doc(i);
- System.out.println(doc.get("Number") + " " + doc.get("Content2") + " Boost: " + doc.getBoost() + ", score : " + rstDoc2.score(i));
- }
- searcher.close();
- } catch(ParseException e){
- System.out.println("ParseException ");
- } catch(IOException e){
- System.out.println("IOException ");
- }
- }
- }