Lucene 全文检索 Lucene的使用
一.简介:
参考百度百科:
http://baike.baidu.com/link?url=eBcEVuUL3TbUivRvtgRnMr1s44nTE70odpjF8VbUpg8z3o8u1mt2PLpP-WnLBZY7ifUNLHDUtKSAQDthiiIhIa
二.使用:
1.必备包:
lucene有7个包需要导入:analysis,document,index,queryParser,search,store,util
2.建立索引:
主要使用类:IndexWriter
主要使用函数:writer.AddDocument(doc);
IndexWriter writer = new IndexWriter("E:/index", new StandardAnalyze(),true,MaxFieldLength.UNLIMITED); //true代表覆盖原先数据,maxFieldLength用来限制Field的大小 Document doc = new Document(); doc.add(new Field("title", "lucene introduction", Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS)); doc.add(new Field("time", "60", Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS)); writer.addDocument(doc); writer.optimize(); //优化 writer.close();
3.检索:
主要类:IndexSearcher
主要函数:searcher.search(query);
IndexSearcher searcher= new IndexSearcher("E:/index"); Query query = new TermQuery(new Term("title", "lucene"));//单个字节查询 //Query query = new FuzzyQuery(new Term("title", "lucene"));//模糊查询 //Query query = new WildcardQuery(new Term("title", "lu*"));//通配符查询 ?代表一个字符,*代表0到多个字符 //BooleanQuery query = new BooleanQuery();//条件查询 //BooleanQuery qson1 = new BooleanQuery(); //Query q1 = new TermQuery(new Term("title", "lucene")); //qson1.add(q1, Occur.MUST);//MUST是必须满足的 //BooleanQuery qson2 = new BooleanQuery(); //Query q2= new TermQuery(new Term("sex", "woman")); //qson2 .add(q2, Occur.MUST_NOT);//MUST_NOT是必须不满足 //query.add(qson1, Occur.SHOULD); //query.add(qson2, Occur.SHOULD);//SHOULD代表满足qson1或者满足qson2都可以 //PhraseQuery query = new PhraseQuery();//近距离查询 //query.setSlop(5);//距离设置为5 //query.add(new Term("title", "lucene")); //query.add(new Term("title", "introduction"));//查询出title中lucene和introduction距离不超过5个字符的结果 //Query query = new PrefixQuery(new Term("title", "lu"));//WildcardQuery的lu*一样 //RangeQuery query = new RangeQuery(new Term("time", "50"),new Term("time", "60"), true); //true代表[50,60],false代表(50,60) Hits hits = searcher.search(query); for (int i = 0; i < hits.length(); i++) { Document d = hits.doc(i); String title= d.get("title"); System.out.print(title+ " "); }
这样,基本上就可以使用了
注:以上代码为lucene早些版本的写法。lucene3.02的写法有所改变。