Question

我需要定期刷新索引。这意味着索引将随着文档的添加而定期更新你认为这是解决方案吗？我需要一个示例源代码能够刷新索引。

好的就像下面的源代码一样。

public class SimpleFileIndexer {
    public static void main(String[] args) throws Exception {
           File indexDir = new File("C:/Users/Raden/Documents/lucene/LuceneHibernate/adi");
           File dataDir = new File("C:/Users/Raden/Documents/lucene/LuceneHibernate/adi");
           String suffix = "txt";

           SimpleFileIndexer indexer = new SimpleFileIndexer();

           int numIndex = indexer.index(indexDir, dataDir, suffix);

           System.out.println("Total files indexed " + numIndex);
    }

    private int index(File indexDir, File dataDir, String suffix) throws Exception {
           IndexWriter indexWriter = new IndexWriter(
                           FSDirectory.open(indexDir),
                           new SimpleAnalyzer(),
                           true,
                           IndexWriter.MaxFieldLength.LIMITED);
           indexWriter.setUseCompoundFile(false);

           indexDirectory(indexWriter, dataDir, suffix);

           int numIndexed = indexWriter.maxDoc();
           indexWriter.optimize();
           indexWriter.close();

           return numIndexed;
    }

    private void indexDirectory(IndexWriter indexWriter, File dataDir, String suffix) throws IOException {
           File[] files = dataDir.listFiles();
           for (int i = 0; i < files.length; i++) {
                   File f = files[i];
                   if (f.isDirectory()) {
                           indexDirectory(indexWriter, f, suffix);
                   }
                   else {
                           indexFileWithIndexWriter(indexWriter, f, suffix);
                   }
           }
    }

    private void indexFileWithIndexWriter(IndexWriter indexWriter, File f, String suffix) throws IOException {
           if (f.isHidden() || f.isDirectory() || !f.canRead() || !f.exists()) {
                   return;
           }
           if (suffix!=null && !f.getName().endsWith(suffix)) {
                   return;
           }
           System.out.println("Indexing file " + f.getCanonicalPath());

           Document doc = new Document();
           doc.add(new Field("contents", new FileReader(f)));
           doc.add(new Field("filename", f.getCanonicalPath(), Field.Store.YES, Field.Index.ANALYZED));

           indexWriter.addDocument(doc);
    }
}

上面的源代码可以在给定目录时索引文档文本文件。现在我要问的是如何让代码运行持续？我应该用什么课？所以每次都有新的添加到该目录的文件然后lucene将索引那些文件自动，你能帮我解决这个问题。我真的需要知道什么是最好的解决方案。

Answer 1

Lucene不能单独做到这一点。您需要监视文件系统。

请看How to detect filesystem has changed in java。

使用lucene定期将新文档刷新到索引

1 个答案: