实例3

最新推荐文章于 2025-01-06 10:45:48 发布

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#constructor #path #string #search #import #class

本文介绍了一个使用Apache Lucene实现范围查询的例子。通过创建索引并搜索指定范围内的文档来演示如何使用RangeQuery。具体步骤包括：初始化索引、添加文档、执行范围查询以及输出查询结果。

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package demo1;

import java.io.File;
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.index.Term;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.RangeQuery;

public class TestRangeQuery {

private final String PATH = "C://index";

public TestRangeQuery() {
// TODO Auto-generated constructor stub
}

public void createIndex() {

  try {
   IndexWriter indexWriter = new IndexWriter(new File(PATH),
     new StandardAnalyzer(), true);

   Document doc1 = new Document();
   Document doc2 = new Document();
   Document doc3 = new Document();
   Document doc4 = new Document();
   Document doc5 = new Document();

   Field no1 = new Field("NO", "00001", Field.Store.YES,
     Field.Index.TOKENIZED);
   Field no2 = new Field("NO", "00002", Field.Store.YES,
     Field.Index.TOKENIZED);
   Field no3 = new Field("NO", "00003", Field.Store.YES,
     Field.Index.TOKENIZED);
   Field no4 = new Field("NO", "00004", Field.Store.YES,
     Field.Index.TOKENIZED);
   Field no5 = new Field("NO", "00005", Field.Store.YES,
     Field.Index.TOKENIZED);

   doc1.add(no1);
   doc2.add(no2);
   doc3.add(no3);
   doc4.add(no4);
   doc5.add(no5);

   indexWriter.addDocument(doc1);
   indexWriter.addDocument(doc2);
   indexWriter.addDocument(doc3);
   indexWriter.addDocument(doc4);
   indexWriter.addDocument(doc5);

indexWriter.optimize();
indexWriter.close();

   System.out.println("创建索引成功！！");
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   System.out.println("创建索引失败！！");
  }

}

/**
*
* @param keyWord
* 输入关键字进行检索
*/
public void searchIndex() {

  try {
   IndexSearcher search = new IndexSearcher(PATH);
//RangeQuery 中的参数解析 RangeQuery(Term lowerTerm, Term upperTerm, boolean inclusive)
//第一个参数表示查询的上界，第二个参数表示查询的下届 false表示不包含临界值
//如果为true 表示包含临界值
   RangeQuery rq = new RangeQuery(new Term("NO", "00002"), new Term(
     "NO", "00004"), true);

   Hits hits = search.search(rq);

   for(int i = 0;i<hits.length();i++){

    Document doc = (Document)hits.doc(i);

    System.out.println("---->>"+doc.get("NO"));

   }