使用solr实现pinyin分词，针对短词搜索，比如电影搜索
1，增加solr拼音查询原理：pinyin4j-2.5.0.jar
下载地址：
http://sourceforge.net/projects/pinyin4j/
solr环境使用3.6.2。
2，Token代码：
package com.freewebsys.index.analysis;
import net.sourceforge.pinyin4j.PinyinHelper;
import net.sourceforge.pinyin4j.format.HanyuPinyinCaseType;
import net.sourceforge.pinyin4j.format.HanyuPinyinOutputFormat;
import net.sourceforge.pinyin4j.format.HanyuPinyinToneType;
import net.sourceforge.pinyin4j.format.HanyuPinyinVCharType;
import net.sourceforge.pinyin4j.format.exception.BadHanyuPinyinOutputFormatCombination;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.ngram.NGramTokenizer;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
public class PinyinTokenizer extends Tokenizer {
private static final int DEFAULT_BUFFER_SIZE = 512;
private boolean done = false;
private int finalOffset;
private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
private OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class);
private HanyuPinyinOutputFormat format = new HanyuPinyinOutputFormat();
// 链接字符串.
private String padding_char = " ";
// 构造函数.
public PinyinTokenizer(Reader reader) {
this(reader, DEFAULT_BUFFER_SIZE);
}
public PinyinTokenizer(Reader input, int bufferSize) {
super(input);
termAtt.resizeBuffer(bufferSize);
format.setCaseType(HanyuPinyinCaseType.LOWERCASE);
format.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
format.setVCharType(HanyuPinyinVCharType.WITH_V);
}
@Override
public final boolean incrementToken() throws IOException {
if (!done) {
clearAttributes();
done = true;
int upto = 0;
char[] buffer = termAtt.buffer();
System.out.println(String.valueOf(buffer));
while (true) {
final int length = input.read(buffer, upto, buffer.length
- upto);
if (length == -1)
break;
upto += length;
if (upto == buffer.length)
buffer = termAtt.resizeBuffer(1 + buffer.length);
}
termAtt.setLength(upto);
String str = termAtt.toString();
termAtt.setEmpty();
StringBuilder stringBuilder = new StringBuilder();
StringBuilder firstLetters = new StringBuilder();
StringBuilder cnLetters = new StringBuilder();
StringBuilder allPinYinLetters = new StringBuilder();
for (int i = 0; i < str.length(); i++) {
char c = str.charAt(i);
if (c < 128) {
stringBuilder.append(c);
} else {
try {
String[] strs = PinyinHelper.toHanyuPinyinStringArray(
c, format);
if (strs != null) {
// get first result by default
String first_value = strs;
// TODO more than one pinyin
// 拼接中文字符.
cnLetters.append(c);
cnLetters.append(this.padding_char);
// 全部拼音字符.
allPinYinLetters.append(first_value);
// 拼接拼音字符.
stringBuilder.append(first_value);
stringBuilder.append(this.padding_char);
// 拼接首字母字符.
firstLetters.append(first_value.charAt(0));
}
} catch (BadHanyuPinyinOutputFormatCombination badHanyuPinyinOutputFormatCombination) {
badHanyuPinyinOutputFormatCombination.printStackTrace();
}
}
}
// let's join them
termAtt.append(stringBuilder.toString());
termAtt.append(this.padding_char);
termAtt.append(cnLetters.toString());
termAtt.append(this.padding_char);
termAtt.append(firstLetters.toString());
termAtt.append(this.padding_char);
// 将全部拼音分词成一个一个输入数据索引。
termAtt.append(mergeNGramPinYin(allPinYinLetters.toString()));
finalOffset = correctOffset(upto);
offsetAtt.setOffset(correctOffset(0), finalOffset);
return true;
}
return false;
}
@Override
public final void end() {
// set final offset
offsetAtt.setOffset(finalOffset, finalOffset);
}
@Override
public void reset(Reader input) throws IOException {
super.reset(input);
this.done = false;
}
public static String mergeNGramPinYin(String allPinYin) {
// 读取字符串
StringReader reader = new StringReader(allPinYin);
// 设置临时变量
String[] pinYinBuffer = null;
if (StringUtils.isNotBlank(allPinYin)) {
// 设置数组长度
pinYinBuffer = new String;
StringBuffer tmpAppendPinYin = new StringBuffer();
NGramTokenizer nGramTokenizer = new NGramTokenizer(reader);
for (int i = 0; i < allPinYin.length(); i++) {
try {
// 循环递增
nGramTokenizer.incrementToken();
// 取得解析后的字符串
CharTermAttribute charTermAttribute = nGramTokenizer
.getAttribute(CharTermAttribute.class);
tmpAppendPinYin.append(String.valueOf(
charTermAttribute.buffer()).trim());
// 每次都给数据赋值.
pinYinBuffer = tmpAppendPinYin.toString();
} catch (IOException e) {
e.printStackTrace();
}
}
}
// 将结果按照空格合并.
return StringUtils.join(pinYinBuffer, " ");
}
}
PinyinTokenizerFactory：
package com.freewebsys.index.analysis;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.solr.analysis.BaseTokenizerFactory;
import java.io.Reader;
/**
*/
public class PinyinTokenizerFactory extends BaseTokenizerFactory {
@Override
public Tokenizer create(Reader input) {
return new PinyinTokenizer(input);
}
}
3，solr 的schema.xml配置：
对于 index和query分开配置：
<!-- standard_text.标准分词.创建使用pinyin分词，搜索不使用. -->
<fieldType name="standard_text" class="solr.TextField"
positionIncrementGap="100">
<analyzer type="index">
<tokenizer class="com.freewebsys.index.analysis.PinyinTokenizerFactory" />
<filter class="solr.LowerCaseFilterFactory" />
<filter class="solr.WordDelimiterFilterFactory"
generateWordParts="1" generateNumberParts="1" catenateWords="0"
catenateNumbers="1" catenateAll="0" splitOnCaseChange="1" />
</analyzer>
<analyzer type="query">
<tokenizer class="solr.StandardTokenizerFactory" />
</analyzer>
</fieldType>
4，使用分词效果：
如果在管理后台测试可以看到上面的分词结果，就说明pinyin分词配置好了。
5，不足：
目前看在搜索完成后，高亮显示还有点问题，因为索引里面增加了很多拼音。
局限性，只能简单对比较段的内容进行分词，比如商品，电影，图书等，要是文字太长使用NGramTokenizer 分词就会增加一堆没用的pinyin。
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