apache lucene的一个简单实例

    就像每个程序都有一个Hello World来让人体验它一样，lucene也可以很简单的提供一个实例。如下（来自lucene in action的例子）有两个类组成： 一个是建立索引 
    import java.io.File;

    import java.io.FileReader;

    import java.io.IOException;

    import java.util.Date;

    import org.apache.lucene.analysis.standard.StandardAnalyzer;

    import org.apache.lucene.document.Document;

    import org.apache.lucene.document.Field;

    import org.apache.lucene.index.IndexWriter;

 

    public class Indexer {

      public static void main(String[] args) throws Exception {

        if (args.length != 2) {

          throw new Exception("Usage: java " + Indexer.class.getName() + " ");

        }

        File indexDir = new File(args[0]);

        File dataDir = new File(args[1]);

        long start = new Date().getTime();

        int numIndexed = index(indexDir, dataDir);

        long end = new Date().getTime();

        System.out.println("Indexing " + numIndexed + " files took " + (end - start) + " milliseconds");

      }

 

      // open an index and start file directory traversal

      public static int index(File indexDir, File dataDir) throws IOException {

        if (!dataDir.exists() || !dataDir.isDirectory()) {

          throw new IOException(dataDir + " does not exist or is not a directory");

        }

        IndexWriter writer = new IndexWriter(indexDir, new StandardAnalyzer(), true);

        writer.setUseCompoundFile(false);

        indexDirectory(writer, dataDir);

        int numIndexed = writer.docCount();

        writer.optimize();

        writer.close();

        return numIndexed;

      }

 

      // recursive method that calls itself when it finds a directory

 

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【责编:landy】

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