Lucene Porter Stemmer not public

问题:

How to use the Porter Stemmber class in Lucene 3.6.2? Here is what I have:

import org.apache.lucene.analysis.PorterStemmer; ... PorterStemmer stemmer = new PorterStemmer(); term = stemmer.stem(term);

I am being told: PorterStemmer is not public in org.apache.lucene.analysis; cannot be accessed from outside package.

Edit: I also read extensively about using Snowball, but it isn't encouraged. What is the right way to stem using Lucene in Java??

回答1:

1) If you want to use PorterStemmer as part of Lucene token analysis process, use PorterStemFilter

Sample code

 class MyAnalyzer extends Analyzer {   public final TokenStream tokenStream(String fieldName, Reader reader) {     return new PorterStemFilter(new LowerCaseTokenizer(reader));   }  }

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2) If you want to use PorterStemmer just for any other application, here is the sourcecode by author himself: PorterStemmer in Java

回答2:

In Lucene later version, PorterStemmer no longer public. So

 class MyAnalyzer extends Analyzer {    public final TokenStream tokenStream(String fieldName, Reader reader) {     return new PorterStemFilter(new LowerCaseTokenizer(reader));    }    }

Or you can use SnowballAnalyzer Stemmer.link (SnowballAnalyzer is deprecated)

import org.tartarus.snowball.ext.PorterStemmer; . . public static  String applyPorterStemmer(String input) throws IOException {          PorterStemmer stemmer = new PorterStemmer();         stemmer.setCurrent(input);         stemmer.stem();         return stemmer.getCurrent();     }

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