《Lucene in Action》 MoreLikeThis 实例

来源：互联网发布：法拉克机器人编程编辑：程序博客网时间：2024/05/17 23:37

在您阅读本篇文章之前请先阅读：

基于lucene实现自己的推荐引擎：http://blog.csdn.net/mingtianhaiyouwo/article/details/50294313

《Lucene in Action》第二版中对MoreLikeThis 介绍的例子，搜索类似的书籍，代码如下，供大家学习参考：

public class BooksMoreLikeThis {public static void main(String[] args) throws Throwable {String indexDir = System.getProperty("index.dir");FSDirectory directory = FSDirectory.open(new File(indexDir));IndexReader reader = IndexReader.open(directory);IndexSearcher searcher = new IndexSearcher(reader);int numDocs = reader.maxDoc();MoreLikeThis mlt = new MoreLikeThis(reader);mlt.setFieldNames(new String[] {"title", "author"});mlt.setMinTermFreq(1);  //默认值是2，建议自己做限制，否则可能查不出结果mlt.setMinDocFreq(1);   //默认值是5，建议自己做限制，否则可能查不出结果for (int docID = 0; docID < numDocs; docID++) {System.out.println();Document doc = reader.document(docID);System.out.println(doc.get("title"));Query query = mlt.like(docID);System.out.println(" query=" + query);TopDocs similarDocs = searcher.search(query, 10);if (similarDocs.totalHits == 0)System.out.println(" None like this");for(int i=0;i<similarDocs.scoreDocs.length;i++) {if (similarDocs.scoreDocs[i].doc != docID) {doc = reader.document(similarDocs.scoreDocs[i].doc);System.out.println(" -> " + doc.getField("title").stringValue());}}}searcher.close();reader.close();directory.close();}}

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