Lucene 3.0.3不删除文档

Question

我们使用Lucene索引一些内部文档.有时我们需要删除文档.这些文档具有唯一的ID,并由类DocItem表示如下(所有代码都是简单的版本,只有重要的(我希望)部分):

public final class DocItem {

  public static final String fID = "id";
  public static final String fTITLE = "title";

  private Document doc = new Document();
  private Field id = new Field(fID, "", Field.Store.YES, Field.Index.ANALYZED);
  private Field title = new Field(fTITLE, "", Field.Store.YES, Field.Index.ANALYZED);

  public DocItem() {
    doc.add(id);
    doc.add(title);
  }

  ... getters & setters

  public getDoc() {
    return doc;
  }
}

因此,要索引文档,将创建一个新的DocItem并将其传递给索引器类,如下所示:

public static void index(DocItem docitem) {
  File file = new File("indexdir");
  Directory dir= new SimpleFSDirectory(file);
  IndexWriter idxWriter = new IndexWriter(dir, new StandardAnalyzer(Version.LUCENE_30), IndexWriter.MaxFieldLength.UNLIMITED);
  idxWriter.addDocument(docitem.getDoc());
  idxWriter.close();
}

我们创建了一个迭代索引目录的辅助方法:

public static void listAll() {
  File file = new File("indexdir");
  Directory dir = new SimpleFSDirectory(file);
  IndexReader reader = IndexReader.open(dir);

  for (int i = 0; i < reader.maxDoc(); i++) {
    Document doc = reader.document(i);
    System.out.println(doc.get(DocItem.fID));
  }
}

运行listAll,我们可以看到我们的文档被正确编入索引.至少,我们可以看到id和其他属性.

我们使用IndexSearcher检索文档,如下所示:

public static DocItem search(String id) {
  File file = new File("indexdir");
  Directory dir = new SimpleFSDirectory(file);
  IndexSearcher searcher = new IndexSearcher(index, true);
  Query q = new QueryParser(Version.LUCENE_30, DocItem.fID, new StandardAnalyzer(Version.LUCENE_30)).parse(id);
  TopDocs td = searcher.search(q, 1);
  ScoreDoc[] hits = td.scoreDocs;
  searcher.close();
  return hits[0];
}

因此,在检索它之后,我们尝试删除它:

public static void Delete(DocItem docitem) {
  File file = new File("indexdir");
  Directory dir= new SimpleFSDirectory(file);
  IndexWriter idxWriter = new IndexWriter(dir, new StandardAnalyzer(Version.LUCENE_30), IndexWriter.MaxFieldLength.UNLIMITED);
  idxWriter.deleteDocuments(new Term(DocItem.fID, docitem.getId()));
  idxWriter.commit();
  idxWriter.close();
}

问题是它不起作用.永远不会删除该文档.如果我在删除后运行listAll(),文档仍然存在.我们试图使用IndexReader,没有幸运.

通过这篇文章和这篇文章,我们认为我们正在使用它accinlgy.

我们做错了什么？有什么建议？我们正在使用lucene 3.0.3和java 1.6.0_24.

TIA,

短发

Answer 1

    public static void Delete(DocItem docitem) {
  File file = new File("indexdir");
  Directory dir= new SimpleFSDirectory(file);
  IndexWriter idxWriter = new IndexWriter(dir, new StandardAnalyzer(Version.LUCENE_30), IndexWriter.MaxFieldLength.UNLIMITED);
  idxWriter.deleteDocuments(new Term(DocItem.fID, docitem.getId()));
  idxWriter.commit();
  idxWriter.close(