【Lucene】近实时搜索

package com.tan.code;

import java.io.File;
import java.io.IOException;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.document.StringField;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
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.TermQuery;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.SimpleFSDirectory;
import org.apache.lucene.util.Version;
import org.wltea.analyzer.lucene.IKAnalyzer;

public class NearRealTimeTest {

public static final String INDEX_DIR_PATH = "E:\\indexDir";

private Analyzer analyzer = null;

private File indexFile = null;

private Directory directory = null;

private IndexReader indexReader = null;

private IndexSearcher indexSearcher = null;
private IndexWriter indexWriter = null;

public void nearRealTime() throws IOException {

analyzer = new IKAnalyzer(true);
indexFile = new File(INDEX_DIR_PATH);
directory = new SimpleFSDirectory(indexFile);

indexWriter = new IndexWriter(directory, new IndexWriterConfig(
Version.LUCENE_43, analyzer));
for (int i = 0; i < 10; i++) {
Document document = new Document();
document.add(new StringField("id", "id" + i, Store.YES));
document.add(new TextField("name", "my name is tank" + i, Store.YES));
document.add(new TextField("content", "content" + i, Store.YES));
indexWriter.addDocument(document);
}

// indexReader = DirectoryReader.open(directory);

// 3.x 旧版本中使用indexWriter.getReader()创建近实时reader,本示例代码使用的是4.3.1版本

indexReader = DirectoryReader.open(indexWriter, true);
indexSearcher = new IndexSearcher(indexReader);

Query query = new TermQuery(new Term("name", "name"));
TopDocs topDocs = indexSearcher.search(query, 100);
System.out.println("命中数：" + topDocs.totalHits);

/*
* 建立索引变更，但是不提交
*/
Query q = new TermQuery(new Term("id", "id1"));
indexWriter.deleteDocuments(q);// 根据id删除一个文档

// 再添加10个
for (int i = 10; i < 20; i++) {
Document document = new Document();
document.add(new StringField("id", "id" + i, Store.YES));
document.add(new TextField("name", "my name is tank" + i, Store.YES));
document.add(new TextField("content", "content" + i, Store.YES));
indexWriter.addDocument(document);
}
//

// reader.reopen();
// 读入新增加的增量索引内容，满足实时索引需求
//
IndexReader newReader = DirectoryReader.openIfChanged(
(DirectoryReader) indexReader, indexWriter, true);

indexReader.close();

Query query2 = new TermQuery(new Term("name", "name"));
indexSearcher = new IndexSearcher(newReader);

TopDocs topDocs2 = indexSearcher.search(query2, 100);
System.out.println("命中数：" + topDocs2.totalHits);

newReader.close();
indexWriter.close();
}
}

package com.tan.test;

import static org.junit.Assert.*;

import java.io.IOException;

import org.junit.Test;

import com.tan.code.NearRealTimeTest;

public class MyTest {

@Test
public void test() throws IOException {
//fail("Not yet implemented");
NearRealTimeTest nearRealTimeTest=new NearRealTimeTest();
nearRealTimeTest.nearRealTime();
}

}