【第一节】Lucene5教程 经典源代码
1、lucene.apache.org2、5.3.1版本
3、源码:
(0)pom:
<dependency>
<groupId>org.apache.lucene</groupId>
<artifactId>lucene-core</artifactId>
<version>5.3.1</version>
</dependency>
<dependency>
<groupId>org.apache.lucene</groupId>
<artifactId>lucene-queryparser</artifactId>
<version>5.3.1</version>
</dependency>
<dependency>
<groupId>org.apache.lucene</groupId>
<artifactId>lucene-analyzers-common</artifactId>
<version>5.3.1</version>
</dependency>
(1)写入:
import java.io.File;
import java.io.FileReader;
import java.nio.file.Paths;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
public class Indexer {
private IndexWriter writer; // 写索引实例
/**
* 构造方法 实例化IndexWriter
* @param indexDir
* @throws Exception
*/
public Indexer(String indexDir)throws Exception{
Directory dir=FSDirectory.open(Paths.get(indexDir));
Analyzer analyzer=new StandardAnalyzer(); // 标准分词器
IndexWriterConfig iwc=new IndexWriterConfig(analyzer);
writer=new IndexWriter(dir, iwc);
}
/**
* 关闭写索引
* @throws Exception
*/
public void close()throws Exception{
writer.close();
}
/**
* 索引指定目录的所有文件
* @param dataDir
* @throws Exception
*/
public int index(String dataDir)throws Exception{
File []files=new File(dataDir).listFiles();
for(File f:files){
indexFile(f);
}
return writer.numDocs();
}
/**
* 索引指定文件
* @param f
*/
private void indexFile(File f) throws Exception{
System.out.println("索引文件:"+f.getCanonicalPath());
Document doc=getDocument(f);
writer.addDocument(doc);
}
/**
* 获取文档,文档里再设置每个字段
* @param f
*/
private Document getDocument(File f)throws Exception {
Document doc=new Document();
doc.add(new TextField("contents",new FileReader(f)));
doc.add(new TextField("fileName", f.getName(),Field.Store.YES));
doc.add(new TextField("fullPath",f.getCanonicalPath(),Field.Store.YES));
return doc;
}
public static void main(String[] args) {
String indexDir="D:\\lucene";
String dataDir="D:\\lucene\\data";
Indexer indexer=null;
int numIndexed=0;
long start=System.currentTimeMillis();
try {
indexer = new Indexer(indexDir);
numIndexed=indexer.index(dataDir);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
indexer.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
long end=System.currentTimeMillis();
System.out.println("索引:"+numIndexed+" 个文件 花费了"+(end-start)+" 毫秒");
}
}
(2)、查询:
import java.nio.file.Paths;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.queryparser.classic.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;
public class Searcher {
public static void search(String indexDir,String q)throws Exception{
Directory dir=FSDirectory.open(Paths.get(indexDir));
IndexReader reader=DirectoryReader.open(dir);
IndexSearcher is=new IndexSearcher(reader);
Analyzer analyzer=new StandardAnalyzer(); // 标准分词器
QueryParser parser=new QueryParser("contents", analyzer);
Query query=parser.parse(q);
long start=System.currentTimeMillis();
TopDocs hits=is.search(query, 10);
long end=System.currentTimeMillis();
System.out.println("匹配 "+q+" ,总共花费"+(end-start)+"毫秒"+"查询到"+hits.totalHits+"个记录");
for(ScoreDoc scoreDoc:hits.scoreDocs){
Document doc=is.doc(scoreDoc.doc);
System.out.println(doc.get("fullPath"));
}
reader.close();
}
public static void main(String[] args) {
String indexDir="D:\\lucene";
String q="Zygmunt Saloni";
try {
search(indexDir,q);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
不错好资源 可以用
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