Question

我想创建一个索引，将url存储为文件名并使用：

Analyzer analyzer = new StandardAnalyzer();
IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_40, analyzer);
FSDirectory dir = FSDirectory.open(new File(index));
IndexWriter writer = new IndexWriter(dir, config);

Document doc = new Document();
doc.add(newField("file_name", rs.getString("file_name"), 
        Field.Store.YES,
        Field.Index.ANALYZED));
writer.addDocument(doc);

但是我得到以下例外：

Exception in thread "main" java.lang.AbstractMethodError:
       org.apache.lucene.analysis.TokenStream.incrementToken()
    at org.apache.lucene.index.DocInverterPerField.processFields(DocInverterPerField.java:133)
    at org.apache.lucene.index.DocFieldProcessorPerThread.processDocument(DocFieldProcessorPerThread.java:248)
    at org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:851)
    at org.apache.lucene.index.DocumentsWriter.addDocument(DocumentsWriter.java:827)
    at org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:2022)
    at org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1996)
    at TextIndex1.main(TextIndex1.java:54)

Answer 1

通常，编译时应该捕获抽象方法调用，如果它是代码中的问题。这是一个运行时错误，通常是由于导入不兼容的jar版本。您使用的Lucene jar版本是什么版本？

另请参阅此问题：Abstract Method Error

另外，关于Lucene版本的另一个注释，您似乎使用的是4.0或更高版本，在这种情况下，不推荐使用Field Field.Index构造函数。您应该使用其中一个Field子类，例如TextField或StringField。

Answer 2

以下是如何使用Lucene 4.6

为文本搜索创建简单索引

public void indexFilmTitle() {
    try {
        Directory dir = FSDirectory.open(new File(AppConstants.INDEX_DIR));
        Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_46);
        IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_46, analyzer);
        iwc.setOpenMode(OpenMode.CREATE);
        IndexWriter writer = new IndexWriter(dir, iwc);

        String sql = "SELECT * FROM sakila.film_text";
        PreparedStatement ps = con.prepareStatement(sql);
        ResultSet rs = ps.executeQuery();
        int i=0;
        while (rs.next()) {
            i++;
            Document doc = new Document();
            Field id = new IntField("id", rs.getInt(1), Field.Store.YES);               
            doc.add(id);
            Field title = new TextField("title", rs.getString(2), Field.Store.YES);
            doc.add(title);
            writer.addDocument(doc);
        }
        writer.close();
    } catch (IOException ex) {
        Logger.getLogger(IndexManager.class.getName()).log(Level.SEVERE, null, ex);
    } catch (SQLException ex) {
        Logger.getLogger(IndexManager.class.getName()).log(Level.SEVERE, null, ex);
    }

}

请注意，您必须使用TextField。

以下是搜索方式：

public void searchFromFilm_Text(String keyword) {
    try {
        IndexReader reader = DirectoryReader.open(FSDirectory.open(new File(AppConstants.INDEX_DIR)));
        IndexSearcher searcher = new IndexSearcher(reader);
        Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_46);
        QueryParser parser = new QueryParser(Version.LUCENE_46, "title", analyzer);            
        Query query = parser.parse(keyword);
        System.out.println("Searching for: " + query.toString("title"));
        TopDocs results = searcher.search(query, 100);             
        ScoreDoc[] hits = results.scoreDocs;
        System.out.println(hits.length);
        for(ScoreDoc sdoc : hits)
        {
            Document doc = searcher.doc(sdoc.doc);
            System.out.println(doc.get("id"));
            System.out.println(doc.get("title"));             
        }
    } catch (IOException ex) {
        Logger.getLogger(SearchManager.class.getName()).log(Level.SEVERE, null, ex);
    } catch (ParseException ex) {
        Logger.getLogger(SearchManager.class.getName()).log(Level.SEVERE, null, ex);
    }

}

希望它有所帮助.....

在Lucene中创建索引时的AbstractMethodError

2 个答案: