Jsp +Js + Jquery + EasyUI + Servlet + Lucene，完成分页

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package loaderman.fy.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 loaderman.fy.entity.Page;
import loaderman.fy.service.ArticleService;
import net.sf.json.JSONArray;public class ArticleServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
this.doPost(request,response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
try { request.setCharacterEncoding("UTF-8"); //获取关键字
String keywords = request.getParameter("keywords");//培训
if(keywords == null || keywords.trim().length()==0){
keywords = "培训";//默认值
} //获取当前页号
String temp = request.getParameter("page");//核心
if(temp == null || temp.trim().length()==0){
temp = "1";//默认值
} //调用业务层
ArticleService articleService = new ArticleService();
Page page = articleService.show(keywords,Integer.parseInt(temp)); //构造Map对象
Map<String,Object> map = new LinkedHashMap<String,Object>();
map.put("total",page.getAllRecordNO());
map.put("rows",page.getArticleList()); //第三方工具将Map转成JSON
JSONArray jsonArray = JSONArray.fromObject(map);
String jsonJAVA = jsonArray.toString(); //去掉二边的[]符号
jsonJAVA = jsonJAVA.substring(1,jsonJAVA.length()-1); //以IO的流方式响应到DataGrid组件
response.setContentType("text/html;charset=UTF-8");
PrintWriter pw = response.getWriter();
pw.write(jsonJAVA);
pw.flush();
pw.close();
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
}

package loaderman.fy.dao;import java.util.ArrayList;
import java.util.List;import loaderman.fy.entity.Article;
import loaderman.util.LuceneUtil;
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;/**
* 持久层 */
public class ArticleDao {
/**
* 根据关键字，获取总记录数
* @return 总记录数
*/
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，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<Article> findAll(String keywords,int start,int size) throws Exception{
List<Article> articleList = 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);
//小技巧
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.document2javabean(document,Article.class);
articleList.add(article);
} return articleList;
} public static void main(String[] args) throws Exception{
ArticleDao dao = new ArticleDao();
System.out.println(dao.getAllRecord("学习")); System.out.println("------------------------------"); System.out.println("第一页");
List<Article> list = dao.findAll("学习",0,2);
for(Article a : list){
System.out.println(a);
}
System.out.println("第二页");
list = dao.findAll("学习",2,2);
for(Article a : list){
System.out.println(a);
}
System.out.println("第三页");
list = dao.findAll("学习",4,2);
for(Article a : list){
System.out.println(a);
}
System.out.println("第四页");
list = dao.findAll("学习",6,2);
for(Article a : list){
System.out.println(a);
}
}
}

package loaderman.fy.entity;/**
* 文章
*/
public class Article {
private Integer id;//编号
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;
}
@Override
public String toString() {
return "编号:" + id+"\n标题：" + title + "\n内容:" + content;
}
}

package loaderman.fy.entity;import java.util.ArrayList;
import java.util.List;/**
* 用于Article的分页类
*/
public class Page {
private Integer currPageNO;//当前页号OK
private Integer perPageSize = 2;//每页显示记录数，默认为2条OK
private Integer allRecordNO;//总记录数OK
private Integer allPageNO;//总页数OK
private List<Article> articleList = new ArrayList<Article>();//内容OK
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> getArticleList() {
return articleList;
}
public void setArticleList(List<Article> articleList) {
this.articleList = articleList;
}
}

package loaderman.fy.service;import loaderman.fy.dao.ArticleDao;
import loaderman.fy.entity.Article;
import loaderman.fy.entity.Page;import java.util.List;/**
* 业务层
*/
public class ArticleService {
//持久层
private ArticleDao articleDao = new ArticleDao();
/**
* 根据关键字和页号，查询内容
*/
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 = articleDao.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;
}
page.setAllPageNO(allPageNO); //封装内容
int size = page.getPerPageSize();
int start = (page.getCurrPageNO()-1) * size;
List<Article> articleList = articleDao.findAll(keywords,start,size);
page.setArticleList(articleList); return page;
} //测试
public static void main(String[] args) throws Exception{
ArticleService test = new ArticleService();
Page page = test.show("学习",4); System.out.println(page.getCurrPageNO());
System.out.println(page.getPerPageSize());
System.out.println(page.getAllRecordNO());
System.out.println(page.getAllPageNO());
for(Article a : page.getArticleList()){
System.out.println(a);
}
}
}

<%@ page language="java" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>使用Jsp +Js + Jquery + EasyUI + Servlet + Lucene，完成分页</title>

<link rel="stylesheet" href="themes/icon.css" type="text/css"></link>
<link rel="stylesheet" href="themes/default/easyui.css" type="text/css"></link>

<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript" src="js/jquery.easyui.min.js"></script>
<script type="text/javascript" src="js/easyui-lang-zh_CN.js"></script>
</head>
<body> 
<form id="myformID">
输入关键字：<input type="text" value="" id="keywordID"/>
<input type="button" value="站内搜索" id="findID"/>
</form>
<script type="text/javascript">
//定位"站内搜索"按钮
$("#findID").click(function(){
//获取关键字
var keyword = $("#keywordID").val();
//去空格
keyword = $.trim(keyword);
//判断
if(keyword.length == 0){
//提示
alert("请输入关键字!!!");
//清空文本框的内容
$("#keywordID").val("");
//定位于输入关键字文本框
$("#keywordID").focus();
}else{
//异步发送请求到服务器
//load表示方法名
//"keywords"表示需要发送的的参数名，后台收：request.getParameter("keywords")
//keyword表示参数值
$("#dg").datagrid("load",{
"keywords" : keyword
});
}
});
</script> 
<table id="dg"></table>
<script type="text/javascript">
$("#dg").datagrid({
url : "${pageContext.request.contextPath}/ArticleServlet?time="+new Date().getTime(),
columns : [[
{field:'id',title:'编号',width:100},
{field:'title',title:'标题',width:100},
{field:'content',title:'内容',width:100}
]],
fitColumns : true,
singleSelect : true,
pagination : true,
pageSize : 2,
pageList : [2]
});
</script> </body>
</html>