lucene入门

package com.jiuqi.test;


import java.io.File;
import java.io.FileReader;
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.CorruptIndexException;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
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.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.store.LockObtainFailedException;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.Version;
import org.junit.Test;


public class HelloLucene {
/**
* 建立索引
*/
@Test
public void index(){
IndexWriter writer = null;
try {
//1、创建Directory
Directory directory = FSDirectory.open(new File("D:\\index"));
//2、创建IndexWriter
IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_36, new StandardAnalyzer(Version.LUCENE_36));
writer = new IndexWriter(directory,iwc);
//3、创建Document对象
Document doc = null;
File file = new File("D:\\lucence");
//4、为Document添加Field
for(File f: file.listFiles()){
doc = new Document();
doc.add(new Field("content",new FileReader(f)));
doc.add(new Field("fileName",f.getName(),Field.Store.YES,Field.Index.NOT_ANALYZED));
doc.add(new Field("filePath",f.getAbsolutePath(),Field.Store.YES,Field.Index.NOT_ANALYZED));
//5、通过IndexWriter添加文档到索引中
writer.addDocument(doc);
}


} catch (CorruptIndexException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (LockObtainFailedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
if(writer != null)
try {
writer.close();
} catch (CorruptIndexException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

@Test
public void searcher(){
IndexReader reader = null;
IndexSearcher searcher = null;
try {
//1、创建Directory
Directory directory = FSDirectory.open(new File("D:\\index"));
//2、创建IndexReader
reader = IndexReader.open(directory);
//3、根据IndexReader创建IndexSearchr
searcher = new IndexSearcher(reader);
//4、创建搜索的Query
//创建parser来确定要搜索的文件的内容，第二个参数表示搜索的域
QueryParser parser = new QueryParser(Version.LUCENE_36, "content", new StandardAnalyzer(Version.LUCENE_36));
//创建query，表示搜索域为content中包含java的文档
Query query = parser.parse("java");
//5、根据searcher搜索并且返回TopDocs
TopDocs tds = searcher.search(query, 10);
//6、根据TopDocs获取ScoreDoc对象
ScoreDoc[] sds = tds.scoreDocs;
for(ScoreDoc sd : sds){
//7、根据searcher和ScoreDoc对象获取具体的Document对象
Document d = searcher.doc(sd.doc);
//8、根据Document对象获取需要的值
System.out.println(d.get("fileName")+"[" + d.get("filePath") + "]");
}

} catch (Exception e) {
e.printStackTrace();
}finally{
try {
if(reader != null){
reader.close();
}
if(searcher != null){
  searcher.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}


}