Lucene学习总结二

一）       创建LuceneUtil工具类，使用反射，封装通用的方法

/** * 工具类 * @author Administrator * */public class LuceneUtil {private static Directory directory;private static Version version;private static Analyzer analyzer;private static MaxFieldLength maxFieldLength;static{try {directory=FSDirectory.open(new File("E:/IndexDB"));version=Version.LUCENE_30;analyzer=new StandardAnalyzer(version);maxFieldLength=MaxFieldLength.LIMITED;} catch (Exception e) {             throw new RuntimeException(e);}}//防止外界new该帮助类private LuceneUtil(){}//将javabean转成Docuement对象public static Document javabenaToDocuemnt(Object obj)throws Exception{Document document=new Document();//获取obj的对象字节码Class clazz = obj.getClass();//通过对象字节码获取私有的属性java.lang.reflect.Field[] reflectFields = clazz.getDeclaredFields();for(java.lang.reflect.Field reField:reflectFields){//强力反射reField.setAccessible(true);//获取属性名,id/title/contentString name = reField.getName();String methodName="get"+name.substring(0, 1).toUpperCase()+name.substring(1);//获取方法，例如：getId()/getTitle()Method method=clazz.getMethod(methodName, null);String value = method.invoke(obj, null).toString();//加入到Docuemnt对象中去，这时javabean的属性与document对象的属性相同document.add(new org.apache.lucene.document.Field(name, value, Store.YES, Index.ANALYZED));}return document;}//将Docuemnt对象转成javabean对象public static Object docuemntToJavaBean(Document document,Class clazz)throws Exception{Object obj=clazz.newInstance();java.lang.reflect.Field[] reflectFields = clazz.getDeclaredFields();for(java.lang.reflect.Field reField:reflectFields){reField.setAccessible(true);String name = reField.getName();String value = document.get(name);BeanUtils.setProperty(obj, name, value);}return obj;}public static Directory getDirectory() {return directory;}public static void setDirectory(Directory directory) {LuceneUtil.directory = directory;}public static Version getVersion() {return version;}public static void setVersion(Version version) {LuceneUtil.version = version;}public static Analyzer getAnalyzer() {return analyzer;}public static void setAnalyzer(Analyzer analyzer) {LuceneUtil.analyzer = analyzer;}public static MaxFieldLength getMaxFieldLength() {return maxFieldLength;}public static void setMaxFieldLength(MaxFieldLength maxFieldLength) {LuceneUtil.maxFieldLength = maxFieldLength;}}

二）       使用LuceneUtil工具类，完成CURD操作

public class ArticleDao {    @Testpublic void add()throws Exception{Article article=new Article(1,"培训","武汉有很多家培训机构");Document docuemnt = LuceneUtil.javabenaToDocuemnt(article);        IndexWriter indexWriter=new IndexWriter(LuceneUtil.getDirectory(),LuceneUtil.getAnalyzer(), LuceneUtil.getMaxFieldLength());        indexWriter.addDocument(docuemnt);indexWriter.close();}@Testpublic void addAll()throws Exception{IndexWriter indexWriter=new IndexWriter(LuceneUtil.getDirectory(),LuceneUtil.getAnalyzer(),LuceneUtil.getMaxFieldLength());Article article1=new Article(1,"培训","武汉有很多家java培训机构");Document docuemnt1 = LuceneUtil.javabenaToDocuemnt(article1);indexWriter.addDocument(docuemnt1);Article article2=new Article(2,"培训","武汉有很多家net培训机构");Document docuemnt2 = LuceneUtil.javabenaToDocuemnt(article2);indexWriter.addDocument(docuemnt2);Article article3=new Article(3,"培训","武汉有很多家php培训机构");Document docuemnt3 = LuceneUtil.javabenaToDocuemnt(article3);indexWriter.addDocument(docuemnt3);Article article4=new Article(4,"培训","武汉有很多家ios培训机构");Document docuemnt4 = LuceneUtil.javabenaToDocuemnt(article4);indexWriter.addDocument(docuemnt4);Article article5=new Article(5,"培训","武汉有很多家ios培训机构");Document docuemnt5 = LuceneUtil.javabenaToDocuemnt(article5);indexWriter.addDocument(docuemnt5);Article article6=new Article(6,"培训","武汉有很多家ios培训机构");Document docuemnt6 = LuceneUtil.javabenaToDocuemnt(article6);indexWriter.addDocument(docuemnt6);Article article7=new Article(7,"培训","武汉有很多家ios培训机构");Document docuemnt7 = LuceneUtil.javabenaToDocuemnt(article7);indexWriter.addDocument(docuemnt7);indexWriter.close();}@Testpublic void update()throws Exception{Article article=new Article(4,"培训","武汉有很多家IOS培训机构");Document docuemnt = LuceneUtil.javabenaToDocuemnt(article);IndexWriter indexWriter=new IndexWriter(LuceneUtil.getDirectory(),LuceneUtil.getAnalyzer(),LuceneUtil.getMaxFieldLength());//更新id为4的docuemnt对象/** * 参数一：term表示需要更新的document对象 *   id表示document对象中的id属性 *   7表示该id属性的值 *   参数二：新的docuemnt对象 */indexWriter.updateDocument(new Term("id","4"),docuemnt);indexWriter.close();}@Testpublic void delete()throws Exception{IndexWriter indexWriter=new IndexWriter(LuceneUtil.getDirectory(),LuceneUtil.getAnalyzer(),LuceneUtil.getMaxFieldLength());indexWriter.deleteDocuments(new Term("id","4"));indexWriter.close();}@Testpublic void deleteAll()throws Exception{IndexWriter indexWriter=new IndexWriter(LuceneUtil.getDirectory(),LuceneUtil.getAnalyzer(),LuceneUtil.getMaxFieldLength());indexWriter.deleteAll();indexWriter.close();}@Testpublic void searchByKey()throws Exception{String keywords="培";List<Article> articles=new ArrayList<Article>();QueryParser queryParser=new QueryParser(LuceneUtil.getVersion(),"content",LuceneUtil.getAnalyzer());        Query query = queryParser.parse(keywords);        IndexSearcher indexSearcher=new IndexSearcher(LuceneUtil.getDirectory());        TopDocs topDocs=indexSearcher.search(query, 100);        for(int i=0;i<topDocs.scoreDocs.length;i++){        ScoreDoc scoreDoc = topDocs.scoreDocs[i];        int no = scoreDoc.doc;        Document document = indexSearcher.doc(no);        Article article =(Article) LuceneUtil.docuemntToJavaBean(document, Article.class);        articles.add(article);        }for(Article article:articles){System.out.println(article);}}}

三）使用lucene完成简单的分页查询

实体类：

 

public class Article {private Integer id;//标题private String title;//标题private String content;//内容public Article(){}public Article(Integer id, String title, String content) {this.id = id;this.title = title;this.content = content;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getContent() {return content;}public void setContent(String content) {this.content = content;}@Overridepublic String toString() {return "编号:"+id+"\n标题："+title+"\n内容:"+content;}}

Page包装类：

 

public class Page {private Integer currPageNo;//当前页private Integer perPageSize=3;//每页显示记录数，默认为2private Integer allRecordNo;//总记录数private Integer allPageNo;//总页数private List<Article> articles=new ArrayList<Article>();public Page(){}public Integer getCurrPageNo() {return currPageNo;}public void setCurrPageNo(Integer currPageNo) {this.currPageNo = currPageNo;}public Integer getPerPageSize() {return perPageSize;}public void setPerPageSize(Integer perPageSize) {this.perPageSize = perPageSize;}public Integer getAllRecordNo() {return allRecordNo;}public void setAllRecordNo(Integer allRecordNo) {this.allRecordNo = allRecordNo;}public Integer getAllPageNo() {return allPageNo;}public void setAllPageNo(Integer allPageNo) {this.allPageNo = allPageNo;}public List<Article> getArticles() {return articles;}public void setArticles(List<Article> articles) {this.articles = articles;}}

dao类：

/** * 持久层 * @author Administrator * */public class ArticleDao {/** * 根据关键字，获取总记录数 * @param keywords * @return * @throws Exception */public int getAllRecord(String keywords)throws Exception{QueryParser queryParser=new QueryParser(LuceneUtil.getVersion(),"content",LuceneUtil.getAnalyzer());        Query query = queryParser.parse(keywords);        IndexSearcher indexSearcher=new IndexSearcher(LuceneUtil.getDirectory());        TopDocs topDocs=indexSearcher.search(query, 2);        //返回符合条件的真实总记录数，受2的影响//        return topDocs.scoreDocs.length;                //返回符合条件的真实总记录数，不受2的影响return topDocs.totalHits;} /** * 根据关键字，批量查询 * @param keywords * @param start从第几条开始查询，索引号从0开始 * @param size最多查多少条 * @return * @throws Exception */public List<Article> findAll(String keywords,int  start,int size)throws Exception{List<Article> articles=new ArrayList<Article>();QueryParser queryParser=new QueryParser(LuceneUtil.getVersion(),"content",LuceneUtil.getAnalyzer());Query query = queryParser.parse(keywords);IndexSearcher indexSearcher=new IndexSearcher(LuceneUtil.getDirectory());TopDocs topDocs=indexSearcher.search(query, 100);int middle=Math.min(start+size, topDocs.totalHits);for(int i=start;i<middle;i++){ScoreDoc scoreDoc = topDocs.scoreDocs[i];int no=scoreDoc.doc;Document document = indexSearcher.doc(no);Article article=(Article) LuceneUtil.docuemntToJavaBean(document, Article.class);articles.add(article);}return articles;}}

service层：

public class ArticleService {      private ArticleDao articleDao=new ArticleDao();public Page show(String keywords,int currPageNo)throws Exception{Page page=new Page();//封装当前页号page.setCurrPageNo(currPageNo);//封装总记录数int allRecord=articleDao.getAllRecord(keywords);page.setAllRecordNo(allRecord);//封装总页数int allPageNo=0;if(page.getAllRecordNo()%page.getPerPageSize()==0){allPageNo=page.getAllRecordNo()/page.getPerPageSize();}else {allPageNo=page.getAllRecordNo()/page.getPerPageSize()+1;}page.setAllPageNo(allPageNo);//封装内容int size=page.getPerPageSize();int start=(page.getCurrPageNo()-1)*size;List<Article> articles =articleDao.findAll(keywords, start, size);page.setArticles(articles);return page;}}

Action层：

public class ArticleServlet extends HttpServlet {private static final long serialVersionUID = 1L;public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {                 this.doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {    request.setCharacterEncoding("UTF-8");try {//获取关键字String keywords=request.getParameter("keywords");if(keywords==null||keywords.trim().length()==0){keywords="培";}//获取当前页号String temp=request.getParameter("currPageNo");if(temp==null||temp.trim().length()==0){temp="1";}//调用业务ArticleService articleService=new ArticleService();Page page=articleService.show(keywords, Integer.parseInt(temp));request.setAttribute("page",page);//将keyword变量绑定到request对象中request.setAttribute("keywords",keywords);//转发list.jsprequest.getRequestDispatcher("/list.jsp").forward(request, response);} catch (Exception e) {e.printStackTrace();throw new RuntimeException(e);}}}

web.xml:

 

<?xml version="1.0" encoding="UTF-8"?><web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">  <display-name></display-name>  <servlet>    <description>This is the description of my J2EE component</description>    <display-name>This is the display name of my J2EE component</display-name>    <servlet-name>ArticleServlet</servlet-name>    <servlet-class>com.yxs.lucene.fy.action.ArticleServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>ArticleServlet</servlet-name>    <url-pattern>/ArticleServlet</url-pattern>  </servlet-mapping>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

jsp:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">    <title>My JSP 'list.jsp' starting page</title>  </head>    <body>    <!-- 输入区 --><form action="${pageContext.request.contextPath}/ArticleServlet" method="POST"><input id="currPageNOID" type="hidden" name="currPageNo" value="1">输入关健字：<input type="text" name="keywords" value="${requestScope.keywords}" maxlength="4"/><input id="searchKey"  type="button" value="站内搜索"/></form>        <script type="text/javascript">        function trim(str){       //先去左边空格       str=str.replace(/^\s*/,"");       //再去右边空格       str=str.replace(/\s*$/,"");       return str;    }           document.getElementById("searchKey").onclick=function(){             //定位表单              var formEle=document.forms[0];              //获取关键字              var keywords=formEle.keywords.value;              keywords=trim(keywords);             if(keywords.length==0){                 alert("请输入关键字");             }else{                 formEle.submit();             }                         }               </script>        <!-- 显示区 --><table border="1" align="center" width="60%"><tr><th>编号</th><th>标题</th><th>内容</th></tr><c:forEach items="${page.articles}" var="c">   <tr>          <td>${c.id}<td>          <td>${c.title}<td>          <td>${c.content}<td>   </tr></c:forEach><!-- 分页栏 --><tr>       <td  colspan="3" align="center">             <a onclick="fy(1);" style="cursor: hand;">首页</a>                             <c:choose>                   <c:when test="${requestScope.page.currPageNo+1<=requestScope.page.allPageNo}">                       <a onclick="fy(${requestScope.page.currPageNo+1})" style="cursor: hand;">【下一页】</a>                   </c:when>                   <c:otherwise>                                            下一页                   </c:otherwise>             </c:choose>                          <c:choose>                  <c:when test="${requestScope.page.currPageNo-1>0 }">                        <a style="text-decoration:none;cursor:hand" onclick="fy(${requestScope.page.currPageNo-1})">【上一页】</a>                  </c:when>                  <c:otherwise>                                           上一页                  </c:otherwise>             </c:choose>             <a style="text-decoration:none;cursor:hand" onclick="fy(${requestScope.page.allPageNo})">尾页</a>                   </td></tr>    </table>    <script type="text/javascript">       function fy(currPageNo){               //定位表单               var formEle=document.forms[0];               alert(currPageNo);               //修改当前页数               formEle.currPageNo.value=currPageNo;               formEle.submit();                }    </script>      </body></html>