lucene使用教程4 --常用类的对象之IndexSearcher

这章主要介绍IndexSearcher

IndexSearcher，一个我们用来搜索IndexWriter创建的索引的命令行程序。(记住我们的Seacher只是用来示范Lucene的搜索API的用法。你的搜索程序也可以是网页或带有GUI的桌面程序或EJB等形式。)

一下代码是从网上剪切过来的，可能有错误，但是原理都是一样的，明白了原理，什么都简单。稍后我会将我自己写的几个测试代码贴上去，可以 关注下后面的文字

MyIndexSearcher对IndexSearcher的创建和回收：

/** *  * @function 查询所有资源 * @param searchParam *            查询内容关键字 * @param pageNum 页码 * @param pageSize 每页显示大小 * @return */public static List<SearchBean> getSearchBeanAll(String searchParam,int pageNum, int pageSize) throws Exception {// 庖丁解牛分词器Analyzer analyzer = new PaodingAnalyzer();// 对用户的输入进行查询searcher = MyIndexSearcher.getInstance(FILE_PATH+ ConfigurationManager.getInstance().getPropertiesValue("common.properties", "AllIndexFilePath") + "/index");// 对用户的输入进行查询Query query = MultiFieldQueryParser.parse(Version.LUCENE_CURRENT,searchParam, new String[] { "title", "content", "url","keyword", "time" }, new BooleanClause.Occur[] {BooleanClause.Occur.SHOULD, BooleanClause.Occur.SHOULD,BooleanClause.Occur.SHOULD, BooleanClause.Occur.SHOULD,BooleanClause.Occur.SHOULD }, analyzer);BooleanQuery bQuery = new BooleanQuery();bQuery.add(query, BooleanClause.Occur.MUST);// 根据字段进行排序，得到查询结果SortField sortField1 = new SortField("time", SortField.STRING, true);// false代表升序，TRUE代表降序SortField sortField2 = new SortField("keyword", SortField.SCORE, false);SortField sortField3 = new SortField("title", SortField.SCORE, false);TopDocs topDocs = searcher.search(bQuery, null, 100000, new Sort(sortField3, sortField2, sortField1));List<SearchBean> list = getSearchResult(analyzer, topDocs, bQuery,searchParam, pageNum, pageSize);// for (SearchBean searchBean : list) {// System.out.println(searchBean.toString());// }return list;}/** *  * @function 得到查询结果 * @param analyzer 分词器 * @param topDocs 搜索文档 * @param query 搜索对象 * @param searchParam 搜索内容关键字 * @param pageNum 页码 * @param pageSize 页显示数 * @return */public static List<SearchBean> getSearchResult(Analyzer analyzer,TopDocs topDocs, Query query, String searchParam, int pageNum,int pageSize) throws Exception {FastVectorHighlighter highlighter = getHighlighter();FieldQuery fieldQuery = highlighter.getFieldQuery(query);ScoreDoc[] scoreDocs = topDocs.scoreDocs;// 查询结果数量num = topDocs.totalHits;// 创建list，将结果保存其中，以便在jsp页面中进行显示List<SearchBean> list = new ArrayList<SearchBean>();// 模拟hibernate的serFirstResult和setMaxResult以便返回指定条目的结果int end = 0;int begin = 0;begin = pageSize * (pageNum - 1);if (begin > num) {begin = begin - pageSize + num % pageSize;}if (pageNum * pageSize > num) {end = num;} elseend = pageNum * pageSize;// System.out.println(num + "/" + begin + "/" + end);try {for (int i = begin; i < end; i++) {String bestFragmentTitle = highlighter.getBestFragment(fieldQuery, searcher.getIndexReader(),scoreDocs[i].doc, "title", 50);String bestFragmentContent = highlighter.getBestFragment(fieldQuery, searcher.getIndexReader(),scoreDocs[i].doc, "content", 100);String bestFragmentKeyword = highlighter.getBestFragment(fieldQuery, searcher.getIndexReader(),scoreDocs[i].doc, "keyword", 100);String bestFragmentTime = highlighter.getBestFragment(fieldQuery, searcher.getIndexReader(),scoreDocs[i].doc, "time", 100);Document doc = searcher.doc(scoreDocs[i].doc);// 取得该条索引文档SearchBean sb = new SearchBean();String id = doc.get("id");String title = doc.get("title");String content = doc.get("content");String url = doc.get("url");String keyword = doc.get("keyword");String time = doc.get("time");String author = doc.get("author");String module = doc.get("module");String type = doc.get("type");sb.setId(id);sb.setTitle((bestFragmentTitle != null && bestFragmentTitle != "") ? bestFragmentTitle: title);sb.setContent((bestFragmentContent != null && bestFragmentContent != "") ? bestFragmentContent: content);sb.setUrl(url);sb.setKeyword((bestFragmentKeyword != null && bestFragmentKeyword != "") ? bestFragmentKeyword: keyword);sb.setTime((bestFragmentTime != null && bestFragmentTime != "") ? bestFragmentTime: time);sb.setAuthor(author);sb.setModule(module);sb.setType(type); list.add(sb);}} catch (Exception e) {e.printStackTrace();logger.error(e.getMessage());} finally {MyIndexSearcher.close();}return list;}