Lucene创建索引入门案例

最近在学习lucene，参考网上的资料写了一个简单搜索demo；

项目jar包：

//索引关键类


<pre name="code" class="java">package com.lucene.index;import java.io.File;
import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
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.queryParser.ParseException;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.store.LockObtainFailedException;
import org.apache.lucene.util.Version;
import org.wltea.analyzer.lucene.IKAnalyzer;import com.lucene.vo.User;/***  * lucene 检索内存索引 非常简单的例子  *  * @author Administrator  *  */
public class searchIndex {private String[] ids = { "1", "2", "3", "4", "5", "6" };private String[] emails = { "aa@itat.org", "bb@itat.org", "cc@cc.org", "dd@sina.org", "ee@zttc.edu", "ff@itat.org" };
//  private String[] contents = { "welcome to visited the space,I like book", "hello boy, I like pingpeng ball", "my name is cc I like game", "I like football",
//          "I like football and I like basketball too", "I like movie and swim" };private String[] contents = { "创建一个内存目录对象，所以这里生成的索引会放在磁盘中，而不是在内存中", "创建索引写入对象，该对象既可以把索引写入到磁盘中也可以写入到内存中", "分词器，分词器就是将检索的关键字分割成一组组词组， 它是lucene检索查询的一大特色之一", "这个是分词器拆分最大长度，因为各种不同类型的分词器拆分的字符颗粒细化程度不一样，所以需要设置一个最长的拆分长度","文档对象，在lucene中创建的索引可以看成数据库中的一张表，表中也可以有字段,往里面添加内容之后可以根据字段去匹配查询", "I like movie and swim" };private String[] names = { "zhangsan", "lisi", "john", "jetty", "mike", "jake" };// 创建一个内存目录对象，所以这里生成的索引会放在磁盘中，而不是在内存中。private Directory directory = null;//IK分词器IKAnalyzer analyzer = null;public searchIndex() {try {directory = FSDirectory.open(new File("H:/lucene/index"));analyzer = new IKAnalyzer(true);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public void index() {/** 创建索引写入对象，该对象既可以把索引写入到磁盘中也可以写入到内存中。*/IndexWriter writer;try {writer = new IndexWriter(directory, new IndexWriterConfig(Version.LUCENE_36, analyzer));//创建之前先删除writer.deleteAll();// 创建Document// 文档对象，在lucene中创建的索引可以看成数据库中的一张表，表中也可以有字段,往里面添加内容之后可以根据字段去匹配查询Document doc =null;for(int i=0;i<ids.length;i++){doc = new Document();doc.add(new Field("id", ids[i], Field.Store.YES, Field.Index.NOT_ANALYZED_NO_NORMS));doc.add(new Field("email", emails[i], Field.Store.YES, Field.Index.NOT_ANALYZED));doc.add(new Field("content", contents[i], Field.Store.NO, Field.Index.ANALYZED));doc.add(new Field("name", names[i], Field.Store.YES, Field.Index.NOT_ANALYZED_NO_NORMS));writer.addDocument(doc);}writer.close(); } catch (CorruptIndexException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (LockObtainFailedException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public List<User> search(String keyword) {long startTime = System.currentTimeMillis();System.out.println("*****************检索开始**********************");List<User> userList = new ArrayList<User>();IndexReader reader;try {reader = IndexReader.open(directory);// 创建IndexSearcher 检索索引的对象，里面要传递上面写入的内存目录对象directoryIndexSearcher searcher = new IndexSearcher(reader);// 根据搜索关键字 封装一个term组合对象，然后封装成Query查询对象QueryParser queryParser = new QueryParser(Version.LUCENE_36, "content", analyzer);Query query = queryParser.parse(keyword);// 去索引目录中查询，返回的是TopDocs对象，里面存放的就是上面放的document文档对象TopDocs rs = searcher.search(query, null, 10);long endTime = System.currentTimeMillis();System.out.println("总共花费" + (endTime - startTime) + "毫秒，检索到" + rs.totalHits + "条记录。");User user = null;for (int i = 0; i < rs.scoreDocs.length; i++) {// rs.scoreDocs[i].doc 是获取索引中的标志位id, 从0开始记录Document firstHit = searcher.doc(rs.scoreDocs[i].doc);user = new User();user.setId(Long.parseLong(firstHit.get("id")));user.setName(firstHit.get("name"));user.setSex(firstHit.get("sex"));user.setDosomething(firstHit.get("dosometing"));user.setEmail(firstHit.get("email"));user.setContent(firstHit.get("content"));userList.add(user);//             System.out.println("name:" + firstHit.get("name"));
//              System.out.println("sex:" + firstHit.get("sex"));
//              System.out.println("dosomething:" + firstHit.get("dosometing"));}reader.close();} catch (CorruptIndexException e1) {// TODO Auto-generated catch blocke1.printStackTrace();} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();} catch (ParseException e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println("*****************检索结束**********************");return userList;}}

package com.lucene;import java.io.IOException;
import java.util.List;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import com.lucene.index.searchIndex;
import com.lucene.vo.User;/*** Servlet implementation class searchServlet*/
public class searchServlet extends HttpServlet {private static final long serialVersionUID = 1L;/*** Default constructor. */public searchServlet() {// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stub}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding("UTF-8");String keyword = request.getParameter("keyword");if("".equals(keyword)){keyword="0";}searchIndex si = new searchIndex();si.index();List<User> userList = si.search(keyword);request.setAttribute("userList", userList);request.getRequestDispatcher("search.jsp").forward(request, response);}}

package com.lucene.vo;public class User {private Long id;private String name;private String sex;private String dosomething;private String email;private String content;public Long getId() {return id;}public void setId(Long id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public String getDosomething() {return dosomething;}public void setDosomething(String dosomething) {this.dosomething = dosomething;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}public String getContent() {return content;}public void setContent(String content) {this.content = content;}}

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>lucene 全文检索</title>
</head>
<body style="text-align: center;"><form action="searchServlet.do" method="post"><input type="text" name="keyword" /> <input type="submit" value="搜索" /></form><div style="height: 10px"></div><c:if test="${not empty userList}"><div>相关信息：</div><table border="1" align="center"><tr><td>ID</td><td>姓名</td><td>性别</td><td>邮箱</td><td>爱好</td><td>正文</td></tr><c:forEach items="${ userList}" var="user"><tr><td>${user.id }</td><td>${user.name }</td><td>${user.sex }</td><td>${user.email }</td><td>${user.dosomething }</td><td>${user.content }</td></tr></c:forEach></table></c:if>
</body>
</html>

代码测试：

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