lucene4.0入门实例

lucene4.0入门实例

 

1:以前用3.5的时候，到现在也差不多忘了，重新看了下文档，写个简单的例子

 

lucene4.0中有很多新的东西，其中Field类主要不能new Field()要通过其子类去实现比如new StringField()等，对分词等参数也有部分变化。

 

创建索引的代码如下：

 

 

 package com.search.lucene;

 import java.io.File;

 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.Store;
 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;
 import org.junit.Before;
 import org.junit.Test;

 public class IndexFile {

     protected String[] ids={"1", "2"};

     protected String[] content={"Amsterdam has lost of add  cancals", "i love  add this girl"};

     protected String[] city={"Amsterdam", "Venice"};

     private Directory dir;

     /**
      * 初始添加文档
      * @throws Exception
      */
     @Test
     public void init() throws Exception {
         String pathFile="D://lucene/index";
         dir=FSDirectory.open(new File(pathFile));
         IndexWriter writer=getWriter();
         for(int i=0; i < ids.length; i++) {
             Document doc=new Document();
             doc.add(new StringField("id", ids[i], Store.YES));
             doc.add(new TextField("content", content[i], Store.YES));
             doc.add(new StringField("city", city[i], Store.YES));
             writer.addDocument(doc);
         }
         System.out.println("init ok?");
         writer.close();
     }

     /**
      * 获得IndexWriter对象
      * @return
      * @throws Exception
      */
     public IndexWriter getWriter() throws Exception {
         Analyzer analyzer=new StandardAnalyzer(Version.LUCENE_40);
         IndexWriterConfig iwc=new IndexWriterConfig(Version.LUCENE_40, analyzer);
         return new IndexWriter(dir, iwc);
     }

 }

 说明下：lucene4.0中有核心包和其他包:我导入

 

 

 package com.search.lucene;

 import java.io.File;

 import org.apache.lucene.document.Document;
 import org.apache.lucene.index.DirectoryReader;
 import org.apache.lucene.index.IndexReader;
 import org.apache.lucene.index.Term;
 import org.apache.lucene.search.IndexSearcher;
 import org.apache.lucene.search.ScoreDoc;
 import org.apache.lucene.search.TermQuery;
 import org.apache.lucene.search.TopDocs;
 import org.apache.lucene.store.Directory;
 import org.apache.lucene.store.FSDirectory;
 import org.junit.Test;

 public class IndexSearch {

     /**
      * 查询
      * @throws Exception
      */
     @Test
     public void search() throws Exception {
         String filePath="D://lucene/index";
         Directory dir=FSDirectory.open(new File(filePath));
         IndexReader reader=DirectoryReader.open(dir);
         IndexSearcher searcher=new IndexSearcher(reader);
         Term term=new Term("content", "add");
         TermQuery query=new TermQuery(term);
         TopDocs topdocs=searcher.search(query, 5);
         ScoreDoc[] scoreDocs=topdocs.scoreDocs;
         System.out.println("查询结果总数---" + topdocs.totalHits+"最大的评分--"+topdocs.getMaxScore());
         for(int i=0; i < scoreDocs.length; i++) {
             int doc = scoreDocs[i].doc;
             Document document = searcher.doc(doc);
             System.out.println("content===="+document.get("content"));
             System.out.println("id--" + scoreDocs[i].doc + "---scors--" + scoreDocs[i].score+"---index--"+scoreDocs[i].shardIndex);
         }
         reader.close();
     }
 }