lucene 入门的小例子

lucene 是一个全文检索的纯java的工具，对中文分词支持不好，需要其他分词组件支持 如 ikanalysize , paoding ，je 等。

 

lucene 的基本流程，首先需要建立索引  index , 然后就是搜索索引 search 。

 

 

下面放出一个入门的例子

 

 

public void testIndexAndSearchold() throws CorruptIndexException, LockObtainFailedException, IOException, ParseException{

 Analyzer analyzer = new StandardAnalyzer();

 

   // Store the index in memory:

   Directory directory = new RAMDirectory();

   // To store an index on disk, use this instead:

   //Directory directory = FSDirectory.getDirectory("/tmp/testindex");

   IndexWriter iwriter = new IndexWriter(directory, analyzer, IndexWriter.MaxFieldLength.LIMITED);

   Document doc = new Document();

   String text = "This is the text to be indexed.";

   doc.add(new Field("fieldname", text, Field.Store.YES,

       Field.Index.ANALYZED));

   iwriter.addDocument(doc);

   iwriter.optimize();

   iwriter.close();

   

   // Now search the index:

   IndexSearcher isearcher = new IndexSearcher(directory);

   // Parse a simple query that searches for "text":

   QueryParser parser = new QueryParser("fieldname", analyzer);

   Query query = parser.parse("text");

   TopDocCollector hits = new TopDocCollector(0);

   isearcher.search(query,hits);

   assertEquals(1, hits.getTotalHits());

   // Iterate through the results:

   for (int i = 0; i < hits.getTotalHits(); i++) {

     Document hitDoc = isearcher.doc(i);

     assertEquals("This is the text to be indexed.", hitDoc.get("fieldname"));

   }

   isearcher.close();

   directory.close();

}