基于Lucene3.5.0如何从TokenStream获得Token

通过学习Lucene3.5.0的doc文档，对不同release版本 lucene版本的API改动做分析。最后找到了有价值的改动信息。

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能够提取响应的Token了

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1. StringReader reader = new StringReader(s);  
2. TokenStream ts =analyzer.tokenStream(s, reader);  
3. TermAttribute ta = ts.getAttribute(TermAttribute.class);  

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

因此我编写了一个例子来更好的从TokenStream中提取Token

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1. package com.segment;  
2.   
3. import java.io.StringReader;  
4. import org.apache.lucene.analysis.Analyzer;  
5. import org.apache.lucene.analysis.Token;  
6. import org.apache.lucene.analysis.TokenStream;  
7. import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;  
8. import org.apache.lucene.analysis.tokenattributes.TermAttribute;  
9. import org.apache.lucene.util.AttributeImpl;  
10. import org.wltea.analyzer.lucene.IKAnalyzer;  
11.   
12.   
13. public class Segment {  
14.     public static String show(Analyzer a, String s) throws Exception {  
15.   
16.         StringReader reader = new StringReader(s);  
17.         TokenStream ts = a.tokenStream(s, reader);  
18.         String s1 = "", s2 = "";  
19.         boolean hasnext= ts.incrementToken();  
20.         //Token t = ts.next();  
21.         while (hasnext) {  
22.             //AttributeImpl ta = new AttributeImpl();  
23.             CharTermAttribute ta = ts.getAttribute(CharTermAttribute.class);  
24.             //TermAttribute ta = ts.getAttribute(TermAttribute.class);  
25.               
26.             s2 = ta.toString() + " ";  
27.             s1 += s2;  
28.             hasnext = ts.incrementToken();  
29.         }  
30.         return s1;  
31.     }  
32.   
33.     public String segment(String s) throws Exception {  
34.         Analyzer a = new IKAnalyzer();  
35.         return show(a, s);  
36.     }  
37.     public static void main(String args[])  
38.     {  
39.         String name = "我是俊杰，我爱编程，我的测试用例";  
40.         Segment s = new Segment();  
41.         String test = "";  
42.         try {  
43.             System.out.println(test+s.segment(name));  
44.         } catch (Exception e) {  
45.             // TODO Auto-generated catch block  
46.             e.printStackTrace();  
47.         }  
48.     }  
49.   
50. }