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();
                 }
             }
         }

     }
 }