前言

? ? ?最早做非結構化數據搜索時用的還是lucene.net，一直說在學習java的同時把lucene這塊搞一搞，這拖了2年多了，終于開始搞這塊了。

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開發環境

? ? idea2016、lucene6.0、jdk1.8

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使用lucene準備條件

1、pom.xml

2、測試數據。 ?我從博客園首頁拿了幾條數據，直接寫了個偽Dao返回一個List<Blog>

public List<Blog> listBlogs(){List<Blog> list = new ArrayList<Blog>();Blog b1=new Blog(6538488,"風過無痕-唐","你真的了解volatile嗎，關于volatile的那些事","http://www.cnblogs.com/tangyanbo/p/6538488.html");Blog b2=new Blog(6541312,"布魯克石","TypeScript設計模式之職責鏈、狀態","http://www.cnblogs.com/brookshi/p/6541312.html");Blog b7=new Blog(6547215,"嶸么么","輕松理解JavaScript閉包","http://www.cnblogs.com/rongmm/p/6547215.html");Blog b3=new Blog(6541220,"一線碼農","使用Task的一些知識優化了一下同事的多線程協作取消的一串代碼","http://www.cnblogs.com/huangxincheng/p/6541220.html");Blog b4=new Blog(6516387,"xybaby","并發與同步、信號量與管程、生產者消費者問題","http://www.cnblogs.com/xybaby/p/6516387.html");Blog b5=new Blog(6532713,"王福朋","深入理解 JavaScript 異步系列（4）—— Generator","http://www.cnblogs.com/wangfupeng1988/p/6532713.html");Blog b6=new Blog(6517788,"歡醉","入坑系列之HAProxy負載均衡","http://www.cnblogs.com/zhangs1986/p/6517788.html");list.add(b1);list.add(b2);list.add(b3);list.add(b4);list.add(b5);list.add(b6);list.add(b7);return list;}

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IndexSearcher搜索

1、搜索體驗，基于servlet開發，直接接受路徑參數key

2、先寫入索引

public class IndexWriterServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {String index_path="d:\\indexDir";Directory dir=null;Analyzer analyzer=null;IndexWriterConfig config=null;IndexWriter indexWriter=null;try {dir =new SimpleFSDirectory(Paths.get(index_path));analyzer=new StandardAnalyzer();config =new IndexWriterConfig(analyzer);indexWriter =new IndexWriter(dir,config);BlogDao blogDao=new BlogDao();List<Blog> list = blogDao.listBlogs();for (Blog blog:list){Document document=new Document();document.add(new Field("id",blog.getId().toString(),TextField.TYPE_STORED));document.add(new Field("author",blog.getAuthor(),TextField.TYPE_STORED));document.add(new Field("title",blog.getTitle(),TextField.TYPE_STORED));document.add(new Field("url",blog.getUrl(),TextField.TYPE_STORED));indexWriter.addDocument(document);}indexWriter.commit();System.out.println("====索引創建完成====");}catch (Exception ex){ex.printStackTrace();}finally {if(indexWriter !=null){indexWriter.close();}}}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req,resp);} }

2、查詢索引數據

public class IndexReaderServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {Directory dir =null;DirectoryReader reader =null;IndexSearcher searcher=null;String index_path="d:\\indexDir";try{//dir =new RAMDirectory();dir =new SimpleFSDirectory(Paths.get(index_path));reader = DirectoryReader.open(dir);searcher=new IndexSearcher(reader);String key = req.getParameter("key");Query query = new TermQuery(new Term("title",key));TopDocs rs=searcher.search(query,100);resp.setContentType("text/html");resp.setCharacterEncoding("UTF-8");PrintWriter out = resp.getWriter();StringBuilder strHtml =new StringBuilder();for (int i = 0; i < rs.scoreDocs.length; i++) {Document firstHit = searcher.doc(rs.scoreDocs[i].doc);strHtml.append("title:"+firstHit.getField("title").stringValue()+"<br>");strHtml.append("author:"+firstHit.getField("author").stringValue()+"<br>");strHtml.append("<a href='"+firstHit.getField("url").stringValue()+"'>"+ firstHit.getField("url").stringValue()+"</a><br>");strHtml.append("====================================================<br>");}out.write(strHtml.toString());}catch (Exception ex){ex.printStackTrace();}finally {reader.close();}}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req,resp);} }

　　

總結

? ? ?讀寫索引用到的幾個關鍵類:IndexWriter、IndexSearcher、Directory、DirectoryReader、Document、TermQuery、Field

轉載于:https://www.cnblogs.com/sword-successful/p/6547965.html

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