java 中文分词算法，基于： lucene+IKAnalyzer

我想只要是学过数据库的孩纸，不管是 mysql ，还是 sqlsever ，一提到查找，本能的想到的便是 like 关键字，其实去转盘网（分类模式）之前也是采用这种算法，但我可以告诉大家一个很不幸的事情， like 匹配其实会浪费大量的有用资源，原因这里不说了请自己想一想，我们还是直接摆事实验证。

现在用去转盘网搜： hello 找个单词，如下：

点击实验

翻页你会发现只要是包含 hello 的单词都找到了，但是如果你用 like 的话是不会有这个效果的，不信让我们再看一下，还好他来说电影网的分词算法我还没来得及修改，还可以看到现象：

点击实验

你会发现只有开始包含 hello 这个字段的搜索串才能得到匹配，这就问题来了，数据库中大量的资源岂不是白白浪费了，不过没事，伟大的人类还是很聪明的，发明了分词，分词的原理我就不讲了，请自己百度吧，还是直接上代码，提示，这里需要四个 jar 包作为工具，我先上传的去转盘，想要做分词的请先下载：

分词包下载地址 1

< href="http://www.quzhuanpan.com/download/checkResult.action?id=34&type=6" rel="nofollow">分词包下载地址 2

package com.tray.indexData; import java.io.File; import java.io.IOException; import java.io.StringReader; import java.math.BigInteger; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import org.apache.lucene.analysis.Analyzer; import org.apache.lucene.analysis.TokenStream; import org.apache.lucene.document.Document; import org.apache.lucene.document.Fieldable; import org.apache.lucene.index.CorruptIndexException; import org.apache.lucene.index.IndexReader; import org.apache.lucene.index.IndexWriter; import org.apache.lucene.index.IndexWriterConfig; import org.apache.lucene.index.IndexWriterConfig.OpenMode; import org.apache.lucene.index.Term; import org.apache.lucene.queryParser.MultiFieldQueryParser; import org.apache.lucene.queryParser.QueryParser; import org.apache.lucene.search.IndexSearcher; import org.apache.lucene.search.PrefixQuery; import org.apache.lucene.search.Query; import org.apache.lucene.search.ScoreDoc; import org.apache.lucene.search.TermQuery; import org.apache.lucene.search.TopDocs; import org.apache.lucene.search.TopScoreDocCollector; import org.apache.lucene.search.WildcardQuery; import org.apache.lucene.search.highlight.Highlighter; import org.apache.lucene.search.highlight.QueryScorer; import org.apache.lucene.search.highlight.SimpleHTMLFormatter; import org.apache.lucene.store.Directory; import org.apache.lucene.store.FSDirectory; import org.apache.lucene.util.Version; import org.wltea.analyzer.lucene.IKAnalyzer; import com.tray.bean.SerachResult; import com.tray.common.tools.DateFormater; public class LuceneSearch { private static String DISC_URL = "/home/indexData/data"; static { String os = System.getProperty("os.name"); if(os.toLowerCase().startsWith("win")){ DISC_URL = "E:\\indexData\\data"; } else{ DISC_URL ="/home/indexData/data"; } } //指定分词器 private Analyzer analyzer=new IKAnalyzer(); private static Directory directory; //配置 private static IndexWriterConfig iwConfig; //配置 IndexWriter private static IndexWriter writer; private static File indexFile = null; private static Version version = Version.LUCENE_36; private final int PAPGESIZE=10; /** * 全量索引 * @Author haoning */ public void init() throws Exception { try { indexFile = new File(DISC_URL); if (!indexFile.exists()) { indexFile.mkdir(); } directory=FSDirectory.open(indexFile); //配置 IndexWriterConfig iwCOnfig= new IndexWriterConfig(version,analyzer); iwConfig.setOpenMode(OpenMode.CREATE_OR_APPEND); //创建写索引对象 writer = new IndexWriter(directory,iwConfig); } catch (Exception e) { } } public void closeWriter(){ try { writer.close(); } catch (CorruptIndexException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public void commit(){ try { writer.commit(); } catch (CorruptIndexException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * 一个一个索引 * @Author haoning */ public void singleIndex(Document doc) throws Exception { writer.addDocument(doc); } /** * 一个跟新 * @Author haoning */ public void singleUpdate(Document doc) throws Exception { Term term = new Term("url", doc.get("url")); writer.updateDocument(term,doc); } /** * 全量索引 * @Author haoning */ public void fullIndex(Document[] documentes) throws Exception { writer.deleteAll(); for (Document document : documentes) { writer.addDocument(document); } writer.commit(); } /** * 根据 id 删除索引 * @Author haoning */ public void deleteIndex(Document document)throws Exception{ Term term = new Term("url", document.get("url"));//url 才是唯一标志 writer.deleteDocuments(term); writer.commit(); } /** * 根据 id 增量索引 * @Author haoning */ public void updateIndex(Document[] documentes) throws Exception{ for (Document document : documentes) { Term term = new Term("url", document.get("url")); writer.updateDocument(term, document); } writer.commit(); } /** * 直接查询 * @Author haoning */ public void simpleSearch(String filedStr,String queryStr,int page, int pageSize) throws Exception{ File indexDir = new File(DISC_URL); //索引目录 Directory dir=FSDirectory.open(indexDir); //根据索引目录创建读索引对象 IndexReader reader = IndexReader.open(dir); //搜索对象创建 IndexSearcher searcher = new IndexSearcher(reader); TopScoreDocCollector topCollector = TopScoreDocCollector.create(searcher.maxDoc(), false); Term term = new Term(filedStr, queryStr); Query query = new TermQuery(term); searcher.search(query, topCollector); ScoreDoc[] docs = topCollector.topDocs((page-1)*pageSize, pageSize).scoreDocs; printScoreDoc(docs, searcher); } /** * 高亮查询 * @Author haoning */ public Map<String, Object> highLightSearch(String filed,String keyWord,int curpage, int pageSize) throws Exception{ List<SerachResult> list=new ArrayList<SerachResult>(); Map<String,Object> map = new HashMap<String,Object>(); if (curpage <= 0) { curpage = 1; } if (pageSize <= 0 || pageSize>20) { pageSize = PAPGESIZE; } File indexDir = new File(DISC_URL); //索引目录 Directory dir=FSDirectory.open(indexDir);//根据索引目录创建读索引对象 IndexReader reader = IndexReader.open(dir);//搜索对象创建 IndexSearcher searcher = new IndexSearcher(reader); int start = (curpage - 1) * pageSize; Analyzer analyzer = new IKAnalyzer(true); QueryParser queryParser = new QueryParser(Version.LUCENE_36, filed, analyzer); queryParser.setDefaultOperator(QueryParser.AND_OPERATOR); Query query = queryParser.parse(keyWord); int hm = start + pageSize; TopScoreDocCollector res = TopScoreDocCollector.create(hm, false); searcher.search(query, res); SimpleHTMLFormatter simpleHTMLFormatter = new SimpleHTMLFormatter("<span style='color:red'>", "</span>"); Highlighter highlighter = new Highlighter(simpleHTMLFormatter, new QueryScorer(query)); long amount = res.getTotalHits(); //long pages = (rowCount - 1) / pageSize + 1; //计算总页数 map.put("amount",amount);//总共多少条记录 TopDocs tds = res.topDocs(start, pageSize); ScoreDoc[] sd = tds.scoreDocs; for (int i = 0; i < sd.length; i++) { Document doc = searcher.doc(sd[i].doc); String temp=doc.get("name"); //做高亮处理 TokenStream ts = analyzer.tokenStream("name", new StringReader(temp)); SerachResult record=new SerachResult(); String name = highlighter.getBestFragment(ts,temp); String skydirverName=doc.get("skydirverName"); String username=doc.get("username"); String shareTime=doc.get("shareTime"); String describ=doc.get("describ"); String typeId=doc.get("typeId"); String id=doc.get("id"); String url=doc.get("url"); record.setName(name); record.setSkydriverName(skydirverName); record.setUsername(username); record.setShareTime(DateFormater.getFormatDate(shareTime,"yyyy-MM-dd HH:mm:ss")); record.setDescrib(describ); record.setTypeId(Integer.parseInt(typeId)); record.setId(new BigInteger(id)); record.setUrl(url); list.add(record); /*System.out.println("name:"+name); System.out.println("skydirverName:"+skydirverName); System.out.println("username:"+username); System.out.println("shareTime:"+shareTime); System.out.println("describ:"+describ); System.out.println("typeId:"+typeId); System.out.println("id:"+id); System.out.println("url:"+url);*/ } map.put("source",list); return map; } /** * 根据前缀查询 * @Author haoning */ public void prefixSearch(String filedStr,String queryStr) throws Exception{ File indexDir = new File(DISC_URL); //索引目录 Directory dir=FSDirectory.open(indexDir); //根据索引目录创建读索引对象 IndexReader reader = IndexReader.open(dir); //搜索对象创建 IndexSearcher searcher = new IndexSearcher(reader); Term term = new Term(filedStr, queryStr); Query query = new PrefixQuery(term); ScoreDoc[] docs = searcher.search(query, 3).scoreDocs; printScoreDoc(docs, searcher); } /** * 通配符查询 * @Author haoning */ public void wildcardSearch(String filedStr,String queryStr) throws Exception{ File indexDir = new File(DISC_URL); //索引目录 Directory dir=FSDirectory.open(indexDir); //根据索引目录创建读索引对象 IndexReader reader = IndexReader.open(dir); //搜索对象创建 IndexSearcher searcher = new IndexSearcher(reader); Term term = new Term(filedStr, queryStr); Query query = new WildcardQuery(term); ScoreDoc[] docs = searcher.search(query, 3).scoreDocs; printScoreDoc(docs, searcher); } /** * 分词查询 * @Author haoning */ public void analyzerSearch(String filedStr,String queryStr) throws Exception{ File indexDir = new File(DISC_URL); //索引目录 Directory dir=FSDirectory.open(indexDir); //根据索引目录创建读索引对象 IndexReader reader = IndexReader.open(dir); //搜索对象创建 IndexSearcher searcher = new IndexSearcher(reader); QueryParser queryParser = new QueryParser(version, filedStr, analyzer); Query query = queryParser.parse(queryStr); ScoreDoc[] docs = searcher.search(query, 3).scoreDocs; printScoreDoc(docs, searcher); } /** * 多属性分词查询 * @Author haoning */ public void multiAnalyzerSearch(String[] filedStr,String queryStr) throws Exception{ File indexDir = new File(DISC_URL); //索引目录 Directory dir=FSDirectory.open(indexDir); //根据索引目录创建读索引对象 IndexReader reader = IndexReader.open(dir); //搜索对象创建 IndexSearcher searcher = new IndexSearcher(reader); QueryParser queryParser = new MultiFieldQueryParser(version, filedStr, analyzer); Query query = queryParser.parse(queryStr); ScoreDoc[] docs = searcher.search(query, 3).scoreDocs; printScoreDoc(docs, searcher); } public void printScoreDoc(ScoreDoc[] docs,IndexSearcher searcher)throws Exception{ for (int i = 0; i < docs.length; i++) { List<Fieldable> list = searcher.doc(docs[i].doc).getFields(); for (Fieldable fieldable : list) { String fieldName = fieldable.name(); String fieldValue = fieldable.stringValue(); System.out.println(fieldName+" : "+fieldValue); } } } } 

注意由于去转盘网是部署到 linux 上的，所以 DISC_URL 可以更具系统变换，我是通过 url 来判定索引文件是否唯一的，你可以更具 id 来判断，具体情况具体对待吧。 注：这是楼主在 V2EX 上发的第二篇技术贴，可惜还是受字数限制只能写一半，老规矩，要看去博客园看吧，链接如下：http://www.cnblogs.com/huangxie/p/5473273.html 你可以在一个 applicationic 程序中开始索引，也可以写个定时器来定时索引，看需求。以上代码是楼主幸苦的作品，转载请不要改动，本人确保代码完全可用。本人建个 qq 群，欢迎大家一起交流技术， 群号： 512245829 喜欢微博的朋友关注：转盘娱乐即可