Lucene_Hello(示例)

（1）创建project

（2）导入Lucene的核心包

（3）编写代码建立索引

/lucene01/src/cn/hk/lucene/TestIndex.java：

package cn.hk.lucene;

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.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;

/**
 * 生成索引
 *
 */
public class TestIndex {
    public static void main(String[] args) {
        IndexWriter writer = null;
        
        try {
            //1、创建Directory
            //在内存中创建
            //Directory directory = new RAMDirectory();
            //在磁盘中创建
            Directory directory = FSDirectory.open(new File("e:\lucene"));            
            
            //2、创建IndexWriter
            IndexWriterConfig config = new IndexWriterConfig(
                    Version.LUCENE_35,
                    new StandardAnalyzer(Version.LUCENE_35));
            
            writer = new IndexWriter(directory,config);
            
            //3、创建Document
            Document doc = null;
            
            //获取files下的所有文件
            File list = new File("e:\lucene\files");
            
            //4、添加Field属性
            //遍历获取到的文件的集合
            for(File file : list.listFiles()){
                //实例化文档对象
                doc = new Document();
                //存储文件的名称信息(对名称进行存储但不分析)
                doc.add(new Field("filename",file.getName(),Field.Store.YES, Field.Index.NOT_ANALYZED));
                doc.add(new Field("path",file.getAbsolutePath(),Field.Store.YES,Field.Index.NOT_ANALYZED));
                
                doc.add(new Field("content",new FileReader(file)));
                
                //将document添加到writer中
                writer.addDocument(doc);
            }
            
        } catch (IOException e) {
            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();
                }
            }
        }
    }
}

/lucene01/src/cn/hk/lucene/TestSearch.java：

package cn.hk.lucene;

import java.io.File;
import java.io.IOException;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.queryParser.ParseException;
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.util.Version;

/**
 * 检索
 *
 */
public class TestSearch {
    public static void main(String[] args) {
        IndexReader reader =null;
        try {
            //1、创建Dierctory
            Directory directory = FSDirectory.open(new File("e:\lucene"));

            //2、创建IndexReader
            reader = IndexReader.open(directory);
            
            //3、创建Searcher
            IndexSearcher searcher = new IndexSearcher(reader);
            
            //4、创建Query
            //参数：匹配器的版本、查询的属性、分析器
            QueryParser parser = new QueryParser(Version.LUCENE_35,
                    "content",
                    new StandardAnalyzer(Version.LUCENE_35));
            
            //查询的条件(相当于数据库中的where部分)
            Query query = parser.parse("users");
            
            //5、创建TopDocs
            //使用查询器进行查询(条件，查询次数)
            TopDocs docs = searcher.search(query, 20);
            
            //6、根据TopDocs获取ScoreDoc
            ScoreDoc[] sds =  docs.scoreDocs;
            
            //7、根据searcher和ScoreDoc获取具体的document(分词所出现的文档)对象
            for(ScoreDoc sd : sds){
                //表示分词所在的文档对象
                Document doc = searcher.doc(sd.doc);
                
                //输出文档的信息
                System.out.println(doc.get("filename") + " | " + doc.get("path"));
            }
            
        } catch (IOException | ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }            
        finally{
            if(reader != null){
                try {
                    reader.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
        
    }
}