lucene索引的创建与搜索

package com.cs.multi;

import java.io.File;
import java.io.IOException;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriter.MaxFieldLength;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.LockObtainFailedException;

import com.cs.itcast.FileToDocumentUtil;
import com.cs.tool.PrintDocumentUtil;

public class MultiDocument {

private static String dataPath = "D:\\work-tool\\workspace\\luencedemo\\datasource";

private static String indexPath = "D:\\work-tool\\workspace\\luencedemo\\directory";

private static Analyzer analyzer = new StandardAnalyzer();

public static void main(String[] args) throws Exception {

//createIndex();
//search();
}

//创建索引

private static void createIndex() throws CorruptIndexException, LockObtainFailedException, IOException, Exception {
File file = new File(dataPath);

IndexWriter indexWriter = new IndexWriter(indexPath, analyzer, true, MaxFieldLength.LIMITED);//四个参数是1:建立索引的位置，2:分词器，3:是否创建索引，4:索引的最大文档内容长度.MaxFieldLength.LIMITED表示:10000，MaxFieldLength.UNLIMITED表示无限大

if(file!=null&&file.isDirectory()){

File[] files = file.listFiles();
for (File f : files) {
Document document = FileToDocumentUtil.fileToDocument(f.getAbsolutePath());
indexWriter.addDocument(document);//添加文档索引

}
indexWriter.close();
}else{
return ;
}
}

//搜索
private static void search() throws CorruptIndexException, IOException{

IndexSearcher indexSearcher = new IndexSearcher(indexPath);  //搜索索引的位置
/*第一种 构建Query

String keyword = "MySQL";
Query query = new TermQuery(new Term("content", keyword.toLowerCase()));   //Term参数是filed字段，要查找的关键词

*/

/*第二种 构建Query

String[] fields = {"path","content","name"};

QueryParser queryParser = new MultiFieldQueryParser(fields,analyzer);//语言分析器 多字段的语言分析器  这个分词器要和创建索引的分词器一样
Query query = queryParser.parse(keyword);

*/
TopDocs topDocs = indexSearcher.search(query, null, 10000);  //查找并返回结果集

int totalHits = topDocs.totalHits; //查询出来的文档总数

System.out.println("查询出来的文档总数为：【"+totalHits+"】条记录数");

//遍历结果集
for (ScoreDoc scoreDoc : topDocs.scoreDocs) {
int doc = scoreDoc.doc;//文档编号
Document document = indexSearcher.doc(doc);//得到该编号的文档
PrintDocumentUtil.print(document);//打印文档内容
}

indexSearcher.close();
}

}

//工具类  将File转化为Document  该Document是lucene的

import java.io.File;

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 com.cs.tool.FileToContent;

public class FileToDocumentUtil {

public static Document fileToDocument(String path) throws Exception{
File file = new File(path);

Document doc = new Document();
//后面两个属性是建立索引和分词
doc.add(new Field("name",file.getName(),Store.YES,Index.ANALYZED));
doc.add(new Field("path",file.getCanonicalPath(),Store.YES,Index.NOT_ANALYZED));
doc.add(new Field("content",FileToContent.fileToContent(file),Store.YES,Index.ANALYZED));
doc.add(new Field("length",file.length()+"",Store.YES,Index.NO));

return doc;
}
}

package com.cs.tool;

import org.apache.lucene.document.Document;

public class PrintDocumentUtil {

//打印文档内容
public static void print(Document doc){
System.out.println("文档路径为"+doc.get("path"));//该Document记录下的字段
System.out.println("文档名称为"+doc.get("name"));
System.out.println("文档内容为"+doc.get("content"));
System.out.println("文档长度为"+doc.get("length"));
}
}