如何在Lucene 5.0中使用ngram标记器? [英] How to have ngram tokenizer in lucene 5.0?

问题描述

我想为一个字符串生成ngram字符.以下是我使用的Lucene 4.1库.

I want to generate ngram characters for a string. Below is the Lucene 4.1 lib I used for it.

    Reader reader = new StringReader(text);
    NGramTokenizer gramTokenizer = new NGramTokenizer(reader, 3, 5); //catch contiguous sequence of 3, 4 and 5 characters

    CharTermAttribute charTermAttribute = gramTokenizer.addAttribute(CharTermAttribute.class);

    while (gramTokenizer.incrementToken()) {
        String token = charTermAttribute.toString();
        System.out.println(token);}

但是，我想使用Lucene 5.0.0来做到这一点. NGramTokenizer在Lucene 5.0.0中与以前的版本相比有很大变化，请参阅

However, I want to use Lucene 5.0.0 to do it. The NGramTokenizer changes a lot in Lucene 5.0.0 from the previous version, refer to http://lucene.apache.org/core/5_0_0/analyzers-common/index.html?org/apache/lucene/analysis/ngram/NGramTokenizer.html.

任何人都知道如何使用Lucene 5.0.0来执行ngram吗?

Anyone knows how to use Lucene 5.0.0 to do ngrams?

推荐答案

以下代码:

  StringReader stringReader = new StringReader("abcd");
  NGramTokenizer tokenizer = new NGramTokenizer(1, 2);
  tokenizer.setReader(stringReader);
  tokenizer.reset();
  CharTermAttribute termAtt = tokenizer.getAttribute(CharTermAttribute.class);
  while (tokenizer.incrementToken()) {
    String token = termAtt.toString();
    System.out.println(token);
  }

将产生:

a
ab
b
bc
c
cd
d

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