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在这里我们需要使用第三方工具将集合转换为JSON,以及用到组件BeanUtils,所以我们需要导入相应的jar包

然后导入JQuery和EasyUI相关js文件

并将EasyUI中的themes文件夹拷到WebRoot

包的结构图如下:

然后我们创建一个实体类Student

package cn.qblank.entity;public class Student {	private Integer id;	private String name;	private String describe;		public Student(){}	public Student(Integer id, String name, String describe) {		super();		this.id = id;		this.name = name;		this.describe = describe;	}	public Integer getId() {		return id;	}	public void setId(Integer id) {		this.id = id;	}	public String getName() {		return name;	}	public void setName(String name) {		this.name = name;	}	public String getDescribe() {		return describe;	}	public void setDescribe(String destcribe) {		this.describe = destcribe;	}		@Override	public String toString() {		return "编号:" + id + "\n" + "姓名:" + name +"\n" + "简历:" + describe;	}}

然后我们创建Page类，用于存储页面的属性:当前页面、每页显示记录数、总记录数、总页数

package cn.qblank.entity;import java.util.ArrayList;import java.util.List;public class Page {	private Integer currPageNO;//当前页号  	private Integer perPageSize = 2;//每页显示记录数，默认为2条	private Integer allRecordNO;//总记录数	private Integer allPageNO;//总页数	private List
   
     studentList = new ArrayList
    
     ();//内容	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
     
       getStudentList() {		return studentList;	}	public void setStudentList(List
      
        studentList) {		this.studentList = studentList;	}	}
      
     
    
   

写好工具类LuceneUtil

package cn.qblank.util;import java.io.File;import java.lang.reflect.Method;import org.apache.commons.beanutils.BeanUtils;import org.apache.lucene.analysis.Analyzer;import org.apache.lucene.analysis.standard.StandardAnalyzer;import org.apache.lucene.document.Document;import org.apache.lucene.document.Field;import org.apache.lucene.document.Field.Index;import org.apache.lucene.document.Field.Store;import org.apache.lucene.index.IndexWriter.MaxFieldLength;import org.apache.lucene.store.Directory;import org.apache.lucene.store.FSDirectory;import org.apache.lucene.util.Version;/** * Lucene工具类 * @author Administrator * */public class LuceneUtil {	private static Directory directory ;	private static Analyzer analyzer ; 	private static Version version; 	private static MaxFieldLength maxFieldLength;		static{		try {			directory = FSDirectory.open(new File("F:/LuceneDB"));			version = Version.LUCENE_30;			analyzer = new StandardAnalyzer(version);//			analyzer = new IKAnalyzer();			maxFieldLength = MaxFieldLength.LIMITED;		} catch (Exception e) {			e.printStackTrace();		}	}		/**	 * javabean转document	 * @param obj	 * @return	 * @throws Exception	 */	public static Document javabean2documemt(Object obj) throws Exception{		//创建document对象		Document document = new Document();		//获取字节码对象		Class clazz = obj.getClass();		//获取该对象中的私有属性: 使用强反射  这里使用类全称，防止和Lucene包起冲突		java.lang.reflect.Field[] reflectfields = clazz.getDeclaredFields();				//遍历字段		for (java.lang.reflect.Field field : reflectfields) {			//设置访问权限:因为字段是私有的			field.setAccessible(true);			String fieldName = field.getName();			//给其拼装成get方法			String methodName = "get" + fieldName.substring(0,1).toUpperCase() + fieldName.substring(1);						Method method = clazz.getMethod(methodName, null);			//调用方法			String returnValue = method.invoke(obj, null).toString();						document.add(new Field(fieldName, returnValue, Store.YES, Index.ANALYZED));		}		return document;	}		/**	 * document转javabean,可以使用BeanUtils组件	 * @throws Exception	 */	public static Object document2javabean(Document document,Class clazz) throws Exception{		//先获取字节码对象		Object obj = clazz.newInstance();		//获取到各个字段名		java.lang.reflect.Field[] reflectField = clazz.getDeclaredFields();		for (java.lang.reflect.Field field : reflectField) {			//设置访问权限			field.setAccessible(true);			//获取各个的字段名和值			String fieldName = field.getName();			String fieldValue = document.get(fieldName);			//使用BeanUtils组件封装对象			BeanUtils.setProperty(obj, fieldName, fieldValue);		}		return obj;	}			public static Directory getDirectory() {		return directory;	}	public static Analyzer getAnalyzer() {		return analyzer;	}	public static Version getVersion() {		return version;	}	public static MaxFieldLength getMaxFieldLength() {		return maxFieldLength;	}	}

接下来我们创建StudentDao类查询Lucene的记录

package cn.qblank.dao;import java.util.ArrayList;import java.util.List;import org.apache.lucene.document.Document;import org.apache.lucene.queryParser.QueryParser;import org.apache.lucene.search.IndexSearcher;import org.apache.lucene.search.Query;import org.apache.lucene.search.ScoreDoc;import org.apache.lucene.search.TopDocs;import org.apache.lucene.search.highlight.Fragmenter;import org.apache.lucene.search.highlight.Highlighter;import org.apache.lucene.search.highlight.QueryScorer;import org.apache.lucene.search.highlight.SimpleFragmenter;import org.apache.lucene.search.highlight.SimpleHTMLFormatter;import cn.qblank.entity.Student;import cn.qblank.util.LuceneUtil;/** * 持久层 * @author Administrator * */public class StudentDao {	/**	 * 根据关键字，获取总记录数	 * @return 总记录数	 */	public int getAllRecord(String keywords) throws Exception{		//创建查询器		QueryParser queryParser = new QueryParser(LuceneUtil.getVersion(), "describe", LuceneUtil.getAnalyzer());		//封装查询数据		Query query = queryParser.parse(keywords);		IndexSearcher indexSearcher = new IndexSearcher(LuceneUtil.getDirectory());		TopDocs topDocs = indexSearcher.search(query, 2);				indexSearcher.close();		//返回符合条件的真实总记录数，不受2的影响		return topDocs.totalHits;		//返回符合条件的总记录数，受2的影响		//return topDocs.scoreDocs.length;	}		/**	 * 根据关键字，批量查询记录	 * @param start 从第几条记录的索引号开始查询，索引号从0开始	 * @param size  最多查询几条记录，不满足最多数目时，以实际为准	 * @return 集合	 */	public List
   
     findAll(String keywords,int start,int size) throws Exception{		//用于存储数据		List
    
      studentList = new ArrayList
     
      ();		//创建查询器QuertParser		QueryParser queryParser = new QueryParser(LuceneUtil.getVersion(), "describe", LuceneUtil.getAnalyzer());		//封装查询数据		Query query = queryParser.parse(keywords);		IndexSearcher indexSearcher = new IndexSearcher(LuceneUtil.getDirectory());		//查询前100条数据		TopDocs topDocs = indexSearcher.search(query, 100);				//将查询的结果高亮显示 		//创建格式对象		SimpleHTMLFormatter formatter = new SimpleHTMLFormatter("
      ", "");		//创建关键字对象		QueryScorer scorer = new QueryScorer(query);		//创建高亮对象		Highlighter highlighter = new Highlighter(formatter, scorer);		//代表显示的字的个数		/*Fragmenter fragmenter = new SimpleFragmenter(4);		highlighter.setTextFragmenter(fragmenter);*/		//进行分页		//获取查询的页数		int middle = Math.min(start + size, topDocs.totalHits);		for (int i = start; i < middle; i++) {			ScoreDoc scoreDoc = topDocs.scoreDocs[i];			//获取编号			int no = scoreDoc.doc;			//查询编号对应的document对象			Document document = indexSearcher.doc(no);						//高亮显示			//关键字高亮显示			String highlighterDescribe = highlighter.getBestFragment(LuceneUtil.getAnalyzer(), "describe",document.get("describe"));			//String highlighterName = highlighter.getBestFragment(LuceneUtil.getAnalyzer(), "name",document.get("name"));			//将标题和内容高亮			document.getField("describe").setValue(highlighterDescribe);			//document.getField("name").setValue(highlighterName);			//将document对象转换为javabean			Student student = (Student) LuceneUtil.document2javabean(document, Student.class);			//将查询出来的数据添加到集合中			studentList.add(student);		}		indexSearcher.close();		return studentList;	}}
     
    
   

然后写好StudentService将查询到的数据进行逻辑判断，并将相应的数据封装到Page对象中

package cn.qblank.service;import java.util.List;import cn.qblank.dao.StudentDao;import cn.qblank.entity.Page;import cn.qblank.entity.Student;/** * 业务层 * @author Administrator * */public class StudentService {	private StudentDao studentDao = new StudentDao();	/**	 * 通过关键字查询内容	 * @param keywords  关键字	 * @param currPageNO 当前页号	 * @throws Exception	 */	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 allRecordNO = studentDao.getAllRecord(keywords);		page.setAllRecordNO(allRecordNO);				//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;		}		//封装总页数		page.setAllPageNO(allPageNO);		//封装内容		Integer size = page.getPerPageSize();		Integer start = (page.getCurrPageNO() -1 ) * size;		List
   
     studentList = studentDao.findAll(keywords, start, size);		page.setStudentList(studentList);				return page;	}}
   

然后写好EasyUI优化过的list.jsp的页面,然后将输入的关键字异步方式传入到后台

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%>              	
   	
   	
       	
   	
   	
   	
       
   		
   	    	    		
   
    			输入关键字：
    			
    		
   
		
   		
           
     

然后后台StudentServlet处理list.jsp的数据

package cn.qblank.action;import java.io.IOException;import java.io.PrintWriter;import java.util.LinkedHashMap;import java.util.Map;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import net.sf.json.JSONArray;import cn.qblank.entity.Page;import cn.qblank.service.StudentService;@SuppressWarnings("serial")public class StudentServlet extends HttpServlet {	@Override	protected void doGet(HttpServletRequest req, HttpServletResponse resp)			throws ServletException, IOException {		this.doPost(req, resp);	}	@Override	protected void doPost(HttpServletRequest req, HttpServletResponse resp)			throws ServletException, IOException {		resp.setContentType("text/html;charset=utf-8");		try {			//获取关键字			String keywords = req.getParameter("keywords");			//如果为空，给默认值  好			if (keywords == null || keywords.trim().length() == 0) {				keywords = "好";			}			//获取当前页号  EasyUI固定写法获取页号			String currPage = req.getParameter("page");			if (currPage == null || currPage.trim().length() == 0) {				currPage = "1";			}			//调用Service			StudentService studentService = new StudentService();			Page page = studentService.show(keywords, Integer.parseInt(currPage));						//构造Map对象			Map
   
     map = new LinkedHashMap<>();			//将总页数和查询的结果列表存入Map集合中			map.put("total", page.getAllRecordNO());			map.put("rows", page.getStudentList());						//将集合转为JSON对象			JSONArray jsonArray = JSONArray.fromObject(map);			//转换为java的字符串格式			String jsonJAVA = jsonArray.toString();			//去掉俩边的[]			jsonJAVA = jsonJAVA.substring(1,jsonJAVA.length() - 1);			//使用O流打印出去			PrintWriter pw = resp.getWriter();			pw.write(jsonJAVA);			pw.flush();			pw.close();					} catch (Exception e) {			e.printStackTrace();		}	}}
   

事先我已经放入5调数据到Lucene库中,添加的代码可以看我的上篇博客

http://blog.csdn.net/evan_qb/article/details/78512216

接下来我们运行下，看下结果