基于Lucene3.5.0怎样从TokenStream获得Token
基于Lucene3.5.0怎样从TokenStream获得Token
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();
}
}
}发布者：全栈程序员栈长，转载请注明出处：https://javaforall.cn/109513.html原文链接：https://javaforall.cn
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