关于Lucene

用lucene 搜索数据库主要分三步 
1、第一步：拿出数据集 
2、第二步：创建索引 
3、第三步：搜索 



第一步： 
Java代码  
Class.forName("oracle.jdbc.driver.OracleDriver");  
Connection connection = DriverManager.getConnection(url, user, password);  
PreparedStatement statement = connection.prepareStatement(sql);  
ResultSet resultSet = statement.executeQuery();  


第二步： 
Java代码  
Directory directory = FSDirectory.open(new File(buildIndexFilePath));  
Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_30);  
IndexWriter indexWriter = new IndexWriter(directory, analyzer, true, IndexWriter.MaxFieldLength.UNLIMITED);  
while(resultSet.next()) {  
    Document document = new Document();  
    document.add(new Field("bankId", "" + resultSet.getString("BANK_ID"), Field.Store.YES , Field.Index.NO , Field.TermVector.NO));  
    document.add(new Field("bankName", "" + resultSet.getString("BANK_NAME"), Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS));  
    document.add(new Field("isSupportPassword", "" + resultSet.getString("IS_SUPPORT_PASSWORD"), Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_OFFSETS));  
    document.add(new Field("payType", "" + resultSet.getString("PAY_TYPE"), Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS));  
    indexWriter.addDocument(document);  
}  
indexWriter.optimize();  
indexWriter.close();  
resultSet.close();  
statement.close();  
connection.close();  


第三步： 
Java代码  
//查询结果  
IndexReader indexReader = IndexReader.open(directory);  
IndexSearcher indexSearcher = new IndexSearcher(indexReader);   
QueryParser queryParser = new QueryParser(Version.LUCENE_30, "bankName", analyzer);  
Query query = queryParser.parse("中信银行");  
TopScoreDocCollector collector = TopScoreDocCollector.create(1000 , false);  
indexSearcher.search(query, collector);  
ScoreDoc[] scoreDocs = collector.topDocs().scoreDocs;  
int numTotalHits = collector.getTotalHits();     
System.out.println("共检索到的数量：" + numTotalHits);  
for(int i=0; i<scoreDocs.length; i++) {  
    Document resultDocument = indexSearcher.doc(scoreDocs[i].doc);  
    String str = resultDocument.get("bankId");  
    String str2 = resultDocument.get("bankName");  
    System.out.println("str: " + str + " <> " + str2);  
}  




三步完成后，可以将结果放到list或者其它集合中，然后再页面中显示！ 

再来一个spring 定时器入门例子，嘿嘿， 

有机会可以 用来 及时追加 数据库索引. 

关于lucene3.0的排序，我纠结了好久，最后通过以下代码完成,原理，就是将时间转化为字符串，完毕 
Java代码  
//按照时间的正序排列，如果SortField的第三个参数为true ， 则为倒序  
            SortField sortField = new SortField("createDate", SortField.STRING, false);  
            Sort sort = new Sort ();    
            sort.setSort(sortField);  
            TopDocs topDocs = indexSearcher.search(query, null, 100, sort);  
            ScoreDoc[] scoreDocs = topDocs.scoreDocs;