它一直喜欢的搜索方向,虽然无法做到。但仍保持了狂热的份额。记得那个夏天、这间实验室、这一群人,一切都随风而逝。踏上新征程。我以前没有自己。面对七三分技术的商业环境,我选择了沉淀。社会是一个大机器,我们只是一个小螺丝钉。我们不能容忍半点扭扭捏捏。
于一个时代的产物。也终将被时代所抛弃。言归正题,在lucene增加自己定义的分词器,须要继承Analyzer类。实现createComponents方法。同一时候定义Tokenzier类用于记录所需建立索引的词以及其在文章的位置,这里继承SegmentingTokenizerBase类,须要实现setNextSentence与incrementWord两个方法。当中。setNextSentence设置下一个句子,在多域(Filed)分词索引时,setNextSentence就是设置下一个域的内容,能够通过new
String(buffer, sentenceStart, sentenceEnd - sentenceStart)获取。而incrementWord方法则是记录每一个单词以及它的位置。须要注意一点就是要在前面加clearAttributes(),否则可能出现first position increment must be > 0...错误。以ICTCLAS分词器为例,以下贴上个人代码,希望能给大家带来帮助,不足之处,多多拍砖。
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.core.LowerCaseFilter;
import org.apache.lucene.analysis.en.PorterStemFilter;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.util.Version; /**
* 中科院分词器 继承Analyzer类。实现其 tokenStream方法
*
* @author ckm
*
*/
public class ICTCLASAnalyzer extends Analyzer { /**
* 该方法主要是将文档转变成lucene建立索 引所需的TokenStream对象
*
* @param fieldName
* 文件名称
* @param reader
* 文件的输入流
*/
@Override
protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
try {
System.out.println(fieldName);
final Tokenizer tokenizer = new ICTCLASTokenzier(reader);
TokenStream stream = new PorterStemFilter(tokenizer);
stream = new LowerCaseFilter(Version.LUCENE_4_9, stream);
stream = new PorterStemFilter(stream);
return new TokenStreamComponents(tokenizer,stream);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null; } public static void main(String[] args) throws Exception {
Analyzer analyzer = new ICTCLASAnalyzer();
String str = "黑客技术";
TokenStream ts = analyzer.tokenStream("field", new StringReader(str));
CharTermAttribute c = ts.addAttribute(CharTermAttribute.class);
ts.reset();
while (ts.incrementToken()) {
System.out.println(c.toString());
} ts.end();
ts.close();
} }
import java.io.IOException;
import java.io.Reader;
import java.text.BreakIterator;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.util.SegmentingTokenizerBase;
import org.apache.lucene.util.AttributeFactory; /**
*
* 继承lucene的SegmentingTokenizerBase,重载其setNextSentence与
* incrementWord方 法,记录所需建立索引的词以及其在文章的位置
*
* @author ckm
*
*/
public class ICTCLASTokenzier extends SegmentingTokenizerBase { private static final BreakIterator sentenceProto = BreakIterator.getSentenceInstance(Locale.ROOT); private final CharTermAttribute termAttr= addAttribute(CharTermAttribute.class);// 记录所需建立索引的词 private final OffsetAttribute offAttr = addAttribute(OffsetAttribute.class);// 记录所需建立索引的词在文章中的位置 private ICTCLASDelegate ictclas;// 分词系统的托付对象 private Iterator<String> words;// 文章分词后形成的单词 private int offSet= 0;// 记录最后一个词元的结束位置 /**
* 构造函数
*
* @param segmented 分词后的结果
* @throws IOException
*/
protected ICTCLASTokenzier(Reader reader) throws IOException {
this(DEFAULT_TOKEN_ATTRIBUTE_FACTORY, reader);
} protected ICTCLASTokenzier(AttributeFactory factory, Reader reader) throws IOException {
super(factory, reader,sentenceProto);
ictclas = ICTCLASDelegate.getDelegate(); } @Override
protected void setNextSentence(int sentenceStart, int sentenceEnd) {
// TODO Auto-generated method stub
String sentence = new String(buffer, sentenceStart, sentenceEnd - sentenceStart);
String result=ictclas.process(sentence);
String[] array = result.split("\\s");
if(array!=null){
List<String> list = Arrays.asList(array);
words=list.iterator();
}
offSet= 0;
} @Override
protected boolean incrementWord() {
// TODO Auto-generated method stub
if (words == null || !words.hasNext()) {
return false;
} else {
String t = words.next();
while(t.equals("")||StopWordFilter.filter(t)){ //这里主要是为了过滤空白字符以及停用词
//StopWordFilter为自己定义停用词过滤类
if (t.length() == 0)
offSet++;
else
offSet+= t.length();
t =words.next();
}
if (!t.equals("") && !StopWordFilter.filter(t)) {
clearAttributes();
termAttr.copyBuffer(t.toCharArray(), 0, t.length());
offAttr.setOffset(correctOffset(offSet), correctOffset(offSet=offSet+ t.length()));
return true;
}
return false;
}
} /**
* 重置
*/
public void reset() throws IOException {
super.reset();
offSet= 0;
} public static void main(String[] args) throws IOException {
String content = "宝剑锋从磨砺出,梅花香自苦寒来! ";
String seg = ICTCLASDelegate.getDelegate().process(content);
//ICTCLASTokenzier test = new ICTCLASTokenzier(seg);
//while (test.incrementToken());
} }
import java.io.File;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import ICTCLAS.I3S.AC.ICTCLAS50; /**
* 中科院分词系统代理类
*
* @author ckm
*
*/
public class ICTCLASDelegate { private static final String userDict = "userDict.txt";// 用户词典 private final static Charset charset = Charset.forName("gb2312");// 默认的编码格式 private static String ictclasPath =System.getProperty("user.dir"); private static String dirConfigurate = "ICTCLASConf";// 配置文件所在文件夹名 private static String configurate = ictclasPath + File.separator+ dirConfigurate;// 配置文件所在文件夹的绝对路径 private static int wordLabel = 2;// 词性标注类型(北大二级标注集) private static ICTCLAS50 ictclas;// 中科院分词系统的jni接口对象 private static ICTCLASDelegate instance = null; private ICTCLASDelegate(){ } /**
* 初始化ICTCLAS50对象
*
* @return ICTCLAS50对象初始化化是否成功
*/
public boolean init() {
ictclas = new ICTCLAS50();
boolean bool = ictclas.ICTCLAS_Init(configurate
.getBytes(charset));
if (bool == false) {
System.out.println("Init Fail!");
return false;
}
// 设置词性标注集(0 计算所二级标注集。1 计算所一级标注集,2 北大二级标注集,3 北大一级标注集)
ictclas.ICTCLAS_SetPOSmap(wordLabel);
importUserDictFile(configurate + File.separator + userDict);// 导入用户词典
ictclas.ICTCLAS_SaveTheUsrDic();// 保存用户字典
return true;
} /**
* 将编码格式转换为分词系统识别的类型
*
* @param charset
* 编码格式
* @return 编码格式相应的数字
**/
public static int getECode(Charset charset) {
String name = charset.name();
if (name.equalsIgnoreCase("ascii"))
return 1;
if (name.equalsIgnoreCase("gb2312"))
return 2;
if (name.equalsIgnoreCase("gbk"))
return 2;
if (name.equalsIgnoreCase("utf8"))
return 3;
if (name.equalsIgnoreCase("utf-8"))
return 3;
if (name.equalsIgnoreCase("big5"))
return 4;
return 0;
} /**
* 该方法的作用是导入用户字典
*
* @param path
* 用户词典的绝对路径
* @return 返回导入的词典的单词个数
*/
public int importUserDictFile(String path) {
System.out.println("导入用户词典");
return ictclas.ICTCLAS_ImportUserDictFile(
path.getBytes(charset), getECode(charset));
} /**
* 该方法的作用是对字符串进行分词
*
* @param source
* 所要分词的源数据
* @return 分词后的结果
*/
public String process(String source) {
return process(source.getBytes(charset));
} public String process(char[] chars){
CharBuffer cb = CharBuffer.allocate (chars.length);
cb.put (chars);
cb.flip ();
ByteBuffer bb = charset.encode (cb);
return process(bb.array()); } public String process(byte[] bytes){
if(bytes==null||bytes.length<1)
return null;
byte nativeBytes[] = ictclas.ICTCLAS_ParagraphProcess(bytes, 2, 0);
String nativeStr = new String(nativeBytes, 0,
nativeBytes.length-1, charset);
return nativeStr;
} /**
* 获取分词系统代理对象
*
* @return 分词系统代理对象
*/
public static ICTCLASDelegate getDelegate() {
if (instance == null) {
synchronized (ICTCLASDelegate.class) {
instance = new ICTCLASDelegate();
instance.init();
}
}
return instance;
} /**
* 退出分词系统
*
* @return 返回操作是否成功
*/
public boolean exit() {
return ictclas.ICTCLAS_Exit();
} public static void main(String[] args) {
String str="结婚的和尚未结婚的";
ICTCLASDelegate id = ICTCLASDelegate.getDelegate();
String result = id.process(str.toCharArray());
System.out.println(result.replaceAll(" ", "-"));
} }
import java.util.Iterator;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern; /**
* 停用词过滤器
*
* @author ckm
*
*/
public class StopWordFilter { private static Set<String> chineseStopWords = null;// 中文停用词集
private static Set<String> englishStopWords = null;// 英文停用词集
static {
init();
} /**
* 初始化中英文停用词集
*/
public static void init() {
LoadStopWords lsw = new LoadStopWords();
chineseStopWords = lsw.getChineseStopWords();
englishStopWords = lsw.getEnglishStopWords();
} /**
* 推断keyword的类型以及推断其是否为停用词 注意:临时仅仅考虑中文,英文。中英混合, 中数混合,英数混合这五种类型。当中中英 混合,
* 中数混合,英数混合还没特定的停用 词库或语法规则对其进行判别
*
* @param word
* keyword
* @return true表示是停用词
*/
public static boolean filter(String word) {
Pattern chinese = Pattern.compile("^[\u4e00-\u9fa5]+$");// 中文匹配
Matcher m1 = chinese.matcher(word);
if (m1.find())
return chineseFilter(word);
Pattern english = Pattern.compile("^[A-Za-z]+$");// 英文匹配
Matcher m2 = english.matcher(word);
if (m2.find())
return englishFilter(word);
Pattern chineseDigit = Pattern.compile("^[\u4e00-\u9fa50-9]+$");// 中数匹配
Matcher m3 = chineseDigit.matcher(word);
if (m3.find())
return chineseDigitFilter(word);
Pattern englishDigit = Pattern.compile("^[A-Za-z0-9]+$");// 英数匹配
Matcher m4 = englishDigit.matcher(word);
if (m4.find())
return englishDigitFilter(word);
Pattern englishChinese = Pattern.compile("^[A-Za-z\u4e00-\u9fa5]+$");// 中英匹配,这个必须在中文匹配与英文匹配之后
Matcher m5 = englishChinese.matcher(word);
if (m5.find())
return englishChineseFilter(word);
return true;
} /**
* 推断keyword是否为中文停用词
*
* @param word
* keyword
* @return true表示是停用词
*/
public static boolean chineseFilter(String word) {
// System.out.println("中文停用词推断");
if (chineseStopWords == null || chineseStopWords.size() == 0)
return false;
Iterator<String> iterator = chineseStopWords.iterator();
while (iterator.hasNext()) {
if (iterator.next().equals(word))
return true;
}
return false;
} /**
* 推断keyword是否为英文停用词
*
* @param word
* keyword
* @return true表示是停用词
*/
public static boolean englishFilter(String word) {
// System.out.println("英文停用词推断");
if (word.length() <= 2)
return true;
if (englishStopWords == null || englishStopWords.size() == 0)
return false;
Iterator<String> iterator = englishStopWords.iterator();
while (iterator.hasNext()) {
if (iterator.next().equals(word))
return true;
}
return false;
} /**
* 推断keyword是否为英数停用词
*
* @param word
* keyword
* @return true表示是停用词
*/
public static boolean englishDigitFilter(String word) {
return false; } /**
* 推断keyword是否为中数停用词
*
* @param word
* keyword
* @return true表示是停用词
*/
public static boolean chineseDigitFilter(String word) {
return false; } /**
* 推断keyword是否为英中停用词
*
* @param word
* keyword
* @return true表示是停用词
*/
public static boolean englishChineseFilter(String word) {
return false; } public static void main(String[] args) {
/*
* Iterator<String> iterator=
* StopWordFilter.chineseStopWords.iterator(); int n=0;
* while(iterator.hasNext()){ System.out.println(iterator.next()); n++;
* } System.out.println("总单词量:"+n);
*/
boolean bool = StopWordFilter.filter("宝剑");
System.out.println(bool);
} }
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set; /**
* 载入停用词文件
*
* @author ckm
*
*/ public class LoadStopWords { private Set<String> chineseStopWords = null;// 中文停用词集 private Set<String> englishStopWords = null;// 英文停用词集 /**
* 获取中文停用词集
*
* @return 中文停用词集Set<String>类型
*/
public Set<String> getChineseStopWords() {
return chineseStopWords;
} /**
* 设置中文停用词集
*
* @param chineseStopWords
* 中文停用词集Set<String>类型
*/
public void setChineseStopWords(Set<String> chineseStopWords) {
this.chineseStopWords = chineseStopWords;
} /**
* 获取英文停用词集
*
* @return 英文停用词集Set<String>类型
*/
public Set<String> getEnglishStopWords() {
return englishStopWords;
} /**
* 设置英文停用词集
*
* @param englishStopWords
* 英文停用词集Set<String>类型
*/
public void setEnglishStopWords(Set<String> englishStopWords) {
this.englishStopWords = englishStopWords;
} /**
* 载入停用词库
*/
public LoadStopWords() {
chineseStopWords = loadStopWords(this.getClass().getResourceAsStream(
"ChineseStopWords.txt"));
englishStopWords = loadStopWords(this.getClass().getResourceAsStream(
"EnglishStopWords.txt"));
} /**
* 从停用词文件里载入停用词, 停用词文件是普通GBK编码的文本文件, 每一行 是一个停用词。凝视利用“//”, 停用词中包含中文标点符号,
* 中文空格, 以及使用率太高而对索引意义不大的词。
*
* @param input
* 停用词文件流
* @return 停用词组成的HashSet
*/
public static Set<String> loadStopWords(InputStream input) {
String line;
Set<String> stopWords = new HashSet<String>();
try {
BufferedReader br = new BufferedReader(new InputStreamReader(input,
"GBK"));
while ((line = br.readLine()) != null) {
if (line.indexOf("//") != -1) {
line = line.substring(0, line.indexOf("//"));
}
line = line.trim();
if (line.length() != 0)
stopWords.add(line.toLowerCase());
}
br.close();
} catch (IOException e) {
System.err.println("不能打开停用词库!。");
}
return stopWords;
} public static void main(String[] args) {
LoadStopWords lsw = new LoadStopWords();
Iterator<String> iterator = lsw.getEnglishStopWords().iterator();
int n = 0;
while (iterator.hasNext()) {
System.out.println(iterator.next());
n++;
}
System.out.println("总单词量:" + n);
} }
这里须要ChineseStopWords.txt 与EnglishStopWords.txt中国和英国都存储停用词,在这里,我们不知道如何上传,有ICTCLAS基本的文件。
下载完整的项目:http://download.csdn.net/detail/km1218/7754907