Lucene 6.1.0 入门Demo

package HighLightSearch;

import java.io.File;
import java.io.FileReader;
import java.nio.file.FileSystems;

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.DirectoryReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
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;

class Index {
// 建立索引
public void index() {
IndexWriter indexWriter = null;

try {
// 1、创建Directory
//JDK 1.7以后 open只能接收Path
Directory directory = FSDirectory.open(FileSystems.getDefault().getPath("C:/Users/jiangl10/Desktop/Java-Workspace/LuceneDemo/data/index"));
// 2、创建IndexWriter
Analyzer analyzer = new StandardAnalyzer();
IndexWriterConfig indexWriterConfig = new IndexWriterConfig(analyzer);
indexWriter = new IndexWriter(directory, indexWriterConfig);
indexWriter.deleteAll();//清除以前的index
//要搜索的File路径
File dFile = new File("C:/Users/jiangl10/Desktop/Java-Workspace/LuceneDemo/data/data");
File[] files = dFile.listFiles();
for (File file : files) {
// 3、创建Document对象
Document document = new Document();
// 4、为Document添加Field
// 第三个参数是FieldType 但是定义在TextField中作为静态变量，看API也不好知道怎么写
document.add(new Field("content", new FileReader(file), TextField.TYPE_NOT_STORED));
document.add(new Field("filename", file.getName(), TextField.TYPE_STORED));
document.add(new Field("filepath", file.getAbsolutePath(), TextField.TYPE_STORED));

// 5、通过IndexWriter添加文档到索引中
indexWriter.addDocument(document);
}

} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (indexWriter != null) {
indexWriter.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}

/*
*  创建Directory
创建IndexReader
根据IndexReader创建IndexSearch
创建搜索的Query
根据searcher搜索并且返回TopDocs
根据TopDocs获取ScoreDoc对象
根据searcher和ScoreDoc对象获取具体的Document对象
根据Document对象获取需要的值
*
*/

class Search {
/**
* 搜索
*/
public void search(String keyWord) {
DirectoryReader directoryReader = null;
try {
// 1、创建Directory
Directory directory = FSDirectory.open(FileSystems.getDefault().getPath("C:/Users/jiangl10/Desktop/Java-Workspace/LuceneDemo/data/index"));
// 2、创建IndexReader
directoryReader = DirectoryReader.open(directory);
// 3、根据IndexReader创建IndexSearch
IndexSearcher indexSearcher = new IndexSearcher(directoryReader);

// 4、创建搜索的Query
Analyzer analyzer = new StandardAnalyzer();
// 创建parser来确定要搜索文件的内容，第一个参数为搜索的域
QueryParser queryParser = new QueryParser("content", analyzer);
// 创建Query表示搜索域为content包含UIMA的文档
Query query = queryParser.parse(keyWord);

// 5、根据searcher搜索并且返回TopDocs
TopDocs topDocs = indexSearcher.search(query, 10);
System.out.println("查找到的文档总共有："+topDocs.totalHits);

// 6、根据TopDocs获取ScoreDoc对象
ScoreDoc[] scoreDocs = topDocs.scoreDocs;
for (ScoreDoc scoreDoc : scoreDocs) {

// 7、根据searcher和ScoreDoc对象获取具体的Document对象
Document document = indexSearcher.doc(scoreDoc.doc);

// 8、根据Document对象获取需要的值
System.out.println(document.get("filename") + " " + document.get("filepath"));
}

} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (directoryReader != null) {
directoryReader.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}

public class HighLightSearch {
public static void main(String args[]) {
Index newIndex = new Index();
newIndex.index();
Search newSearch = new Search();
newSearch.search("UIMA");
}
}