Lucene（NIOFSDirectory、RAMDirectory）

import java.io.File; 

import org.apache.lucene.analysis.standard.StandardAnalyzer; 
import org.apache.lucene.document.Document; 
import org.apache.lucene.document.Field; 
import org.apache.lucene.document.Field.Index; 
import org.apache.lucene.document.Field.Store; 
import org.apache.lucene.index.IndexReader; 
import org.apache.lucene.index.IndexWriter; 
import org.apache.lucene.index.IndexWriter.MaxFieldLength; 
import org.apache.lucene.queryParser.QueryParser; 
import org.apache.lucene.search.IndexSearcher; 
import org.apache.lucene.search.Query; 
import org.apache.lucene.search.ScoreDoc; 
import org.apache.lucene.search.TopDocs; 
import org.apache.lucene.store.NIOFSDirectory; 
import org.apache.lucene.store.RAMDirectory; 
import org.apache.lucene.util.Version; 

public class TestLucen { 

public static final String path = "E:\\workspaces\\lucene\\index"; 

public static void main(String[] args) throws Exception { 
writeIndex(); 
readIndex("text", "area"); 
} 

public static void writeIndex() throws Exception { 
// 硬盘索引 
IndexWriter writer = new IndexWriter( 
new NIOFSDirectory(new File(path)), new StandardAnalyzer( 
Version.LUCENE_30), MaxFieldLength.LIMITED); 
// Ram索引 
RAMDirectory ram = new RAMDirectory(); 
IndexWriter ramwriter = new IndexWriter(ram, new StandardAnalyzer( 
Version.LUCENE_30), MaxFieldLength.LIMITED); 
Document doc = new Document(); 
Document doc1 = new Document(); 

doc.add(new Field("text", "It is a text area", Store.YES, 
Index.ANALYZED_NO_NORMS)); 
doc.add(new Field("info", "It is a Infomation  area", Store.YES, 
Index.ANALYZED_NO_NORMS)); 
writer.addDocument(doc); 

doc1.add(new Field("text", "it is another area", Store.YES, 
Index.ANALYZED)); 
ramwriter.addDocument(doc1); 
ramwriter.optimize(); 
ramwriter.close(); 
// 将Ram索引合并到硬盘索引上，必须先调用ram的close方法 
writer.addIndexes(IndexReader.open(ram)); 
writer.optimize(); 
writer.close(); 
} 

public static void readIndex(String field, String keyword) throws Exception { 
IndexSearcher searcher = new IndexSearcher(new NIOFSDirectory(new File( 
path))); 
Query query = new QueryParser(Version.LUCENE_30, field, 
new StandardAnalyzer(Version.LUCENE_30)).parse(keyword); 
TopDocs docs = searcher.search(query, 10); 
System.out.println("查找到" + docs.totalHits + "个\n对应的text为："); 
ScoreDoc[] doc = docs.scoreDocs; 
for (ScoreDoc d : doc) { 
Document docu = searcher.doc(d.doc); 
System.out.println(docu.get(field)); 
} 
} 
} 

执行结果：



查找到2个

对应的text为：

It is a text area

it is another area

评论

2 楼 胡小米 2012-02-24  

liuInsect 写道

你这里的内存索引根本就没用嘛...  都是把索引建立在了硬盘上  然后又去去硬盘上的哪个文件啊...... 

这里只是说可以采用RAM索引方式，效率快些，后面只是说可以将Ram索引合并到硬盘索引上

1 楼 liuInsect 2012-02-13  

你这里的内存索引根本就没用嘛...  都是把索引建立在了硬盘上  然后又去去硬盘上的哪个文件啊......