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基于Lucene3.5.0怎样从TokenStream获得Token

2024-07-13 05:16:21   223人阅读

通过学习Lucene3.5.0的doc文档，对不同release版本号 lucene版本号的API修改做分析。最后找到了有价值的修改信息。
  • LUCENE-2302: Deprecated TermAttribute and replaced by a new CharTermAttribute. The change is backwards compatible, so mixed new/old TokenStreams all work on the same char[] buffer independent of which interface they use. CharTermAttribute has shorter method names and implements CharSequence and Appendable. This allows usage like Java‘s StringBuilder in addition to direct char[] access. Also terms can directly be used in places where CharSequence is allowed (e.g. regular expressions). (Uwe Schindler, Robert Muir)
  • 以上信息可以知道，原来的通过的方法已经不可以提取响应的Token了
    StringReader reader = new StringReader(s);
TokenStream ts =analyzer.tokenStream(s, reader);
TermAttribute ta = ts.getAttribute(TermAttribute.class);

  • 通过分析Api文档信息 可知，CharTermAttribute已经成为替换TermAttribute的接口
  • 因此我编写了一个样例来更好的从TokenStream中提取Token


  • package com.segment;

import java.io.StringReader;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.Token;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.TermAttribute;
import org.apache.lucene.util.AttributeImpl;
import org.wltea.analyzer.lucene.IKAnalyzer;


public class Segment {
	public static String show(Analyzer a, String s) throws Exception {

		StringReader reader = new StringReader(s);
		TokenStream ts = a.tokenStream(s, reader);
		String s1 = "", s2 = "";
		boolean hasnext= ts.incrementToken();
		//Token t = ts.next();
		while (hasnext) {
			//AttributeImpl ta = new AttributeImpl();
			CharTermAttribute ta = ts.getAttribute(CharTermAttribute.class);
			//TermAttribute ta = ts.getAttribute(TermAttribute.class);
			
			s2 = ta.toString() + " ";
			s1 += s2;
			hasnext = ts.incrementToken();
		}
		return s1;
	}

	public String segment(String s) throws Exception {
		Analyzer a = new IKAnalyzer();
		return show(a, s);
	}
	public static void main(String args[])
	{
		String name = "我是俊杰，我爱编程，我的測试用例";
		Segment s = new Segment();
		String test = "";
		try {
			System.out.println(test+s.segment(name));
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

    •


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