wordSegment = new WordSegmenter();
}
public TokenStream tokenStream(String fieldName, Reader reader) {
TokenStream result = new SentenceTokenizer(reader);
result = new WordTokenizer(result, wordSegment);
// result = new LowerCaseFilter(result);
// 不再需要LowerCaseFilter，因为SegTokenFilter已经将所有英文字符转换成小写
// stem太严格了, This is not bug, this feature:)
result = new PorterStemFilter(result);
if (stopWords != null) {