开发笔记:[lucene系列笔记2]在eclipse里初步使用lucene的索引和查询功能

import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.io.*;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.StringField;
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;
import org.apache.lucene.util.Version;
/**
* @author song
* @description:
* 依赖jar：Lucene-core，lucene-analyzers-common，lucene-queryparser
* 作用：简单的索引建立
*/
public class IndexFiles {
public static Version luceneVersion = Version.LATEST;
/**
* 建立索引
*/
public static void createIndex(){
IndexWriter writer = null;
try{
//1、创建Directory
//Directory directory = new RAMDirectory();//创建内存directory
Directory directory = FSDirectory.open(Paths.get("D:/lucenetest/index"));//在硬盘上生成Directory00
//2、创建IndexWriter
IndexWriterConfig iwCOnfig= new IndexWriterConfig( new StandardAnalyzer());
writer = new IndexWriter(directory, iwConfig);
//3、创建document对象
Document document = null;
//4、为document添加field对象
File f = new File("D:/lucenetest/files");//索引源文件位置
for (File file:f.listFiles()){
document = new Document();
document.add(new StringField("path", f.getName(),Field.Store.YES));
System.out.println(file.getName());
document.add(new StringField("name", file.getName(),Field.Store.YES));
InputStream stream = Files.newInputStream(Paths.get(file.toString()));
document.add(new TextField("content", new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8))));//textField内容会进行分词
//document.add(new TextField("content", new FileReader(file))); 如果不用utf-8编码的话直接用这个就可以了
writer.addDocument(document);
}
}catch(Exception e){
e.printStackTrace();
}finally{
//6、使用完成后需要将writer进行关闭
try {
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) throws IOException
{
createIndex();
}
}

import java.nio.file.Paths;
import java.io.*;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
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;
import org.apache.lucene.util.Version;
/**
* @author song
* @description:
* 依赖jar：Lucene-core，lucene-analyzers-common，lucene-queryparser
* 作用：使用索引搜索文件
*/
public class SearchFiles {
public static Version luceneVersion = Version.LATEST;
/**
* 查询内容
*/
public static String indexSearch(String keywords){
String res = "";
DirectoryReader reader = null;
try{
// 1、创建Directory
Directory directory = FSDirectory.open(Paths.get("D:/lucenetest/index"));//在硬盘上生成Directory
// 2、创建IndexReader
reader = DirectoryReader.open(directory);
// 3、根据IndexWriter创建IndexSearcher
IndexSearcher searcher = new IndexSearcher(reader);
// 4、创建搜索的query
// 创建parse用来确定搜索的内容，第二个参数表示搜索的域
QueryParser parser = new QueryParser("content",new StandardAnalyzer());//content表示搜索的域或者说字段
Query query = parser.parse(keywords);//被搜索的内容
// 5、根据Searcher返回TopDocs
TopDocs tds = searcher.search(query, 20);//查询20条记录
// 6、根据TopDocs获取ScoreDoc
ScoreDoc[] sds = tds.scoreDocs;
// 7、根据Searcher和ScoreDoc获取搜索到的document对象
int cou=0;
for(ScoreDoc sd:sds){
cou++;
Document d = searcher.doc(sd.doc);
// 8、根据document对象获取查询的字段值
/** 查询结果中content为空，是因为索引中没有存储content的内容，需要根据索引path和name从原文件中获取content**/
res+=cou+". "+d.get("path")+" "+d.get("name")+" "+d.get("content")+"\\n";
}

}catch(Exception e){
e.printStackTrace();
}finally{
//9、关闭reader
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return res;
}
public static void main(String[] args) throws IOException
{
System.out.println(indexSearch("你好")); //搜索的内容可以修改
}
}