lucene对index索引中的document进行修改示例

最新推荐文章于 2020-05-22 06:53:21 发布

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本文示例展示了如何在Lucene中简单地修改索引中已存在的文档内容，包括修改特定字段的值。通过创建索引、添加文档、查询和更新文档等步骤，实现了对文档内容的高效管理。

示例比较简单，就是简单对索引中的一个存在的document进行内容的修改。

package com.cn;

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.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.Version;

public class TT {

	public static void main(String []args) throws Exception {
		String [] ids = {"1","2","3"};
		String [] contents = {"shenyang is a city","dalian is a city","jinzhou is a city"};
		String [] city = {"shenyang","dalian","jinzhou"};
		Directory directory = new RAMDirectory();;
		
		IndexWriter indexWriter = new IndexWriter(directory,new IndexWriterConfig(Version.LUCENE_34, new StandardAnalyzer(Version.LUCENE_34)));
		for(int i = 0;i < ids.length;i++){
			Document doc = new Document();
			doc.add(new Field("id",ids[i],Field.Store.YES,Field.Index.NOT_ANALYZED));
			doc.add(new Field("contents",contents[i],Field.Store.YES,Field.Index.ANALYZED));
			doc.add(new Field("city",city[i],Field.Store.YES,Field.Index.ANALYZED));
			indexWriter.addDocument(doc);
		}
		System.out.println("total:"+indexWriter.numDocs());
		indexWriter.close();
		
		queryMethod(directory,"city","shenyang");
		queryMethod(directory,"city","yinkou");
		
		indexWriter = new IndexWriter(directory,new IndexWriterConfig(Version.LUCENE_34, new StandardAnalyzer(Version.LUCENE_34)));
		Document doc = new Document();
		doc.add(new Field("id","1",Field.Store.YES,Field.Index.NOT_ANALYZED));
		doc.add(new Field("contents","yinkou is a city smaller than shenyang",Field.Store.YES,Field.Index.ANALYZED));
		doc.add(new Field("city","yinkou",Field.Store.YES,Field.Index.ANALYZED));
		indexWriter.updateDocument(new Term("id","1"), doc);
		indexWriter.close();
		System.out.println("\nindex is changed\n");
		
		queryMethod(directory,"city","shenyang");
		queryMethod(directory,"city","yinkou");
	}
	
	public static void queryMethod(Directory directory,String item,String txt)throws Exception {
		Term term = new Term(item,txt);
		Query query = new TermQuery(term);
		IndexSearcher indexSearcher = new IndexSearcher(directory);
		TopDocs topDocs = indexSearcher.search(query, 10);
		System.out.println("it has "+topDocs.totalHits+" "+txt+" in "+item);
		ScoreDoc [] scoreDoc = topDocs.scoreDocs;
		for(int i=0;i<scoreDoc.length;i++){
			Document d = indexSearcher.doc(scoreDoc[i].doc);
			System.out.println("city:"+d.get("city"));
			System.out.println("contents:"+d.get("contents"));
		}
	}
}