对内存中Lucene查询的集合进行分页

1、页面，显示分页工具栏

<jsp:include page="pageTool.jsp">
						<jsp:param name="counts" value="<%=resultList.size() %>"/>
						<jsp:param name="limit" value="<%=limit %>"/>
						<jsp:param name="currentPage" value="<%=currentPage %>"/>
					</jsp:include>

2、分页工具类

package com.trade.commen;

public class Calculator {

	int limit = 10;//默认显示10条
	int pagesNum = 0;//总页数
	int counts = 0;//总记录数
	public Calculator(int limit, int counts) {
		super();
		this.limit = limit;
		this.counts = counts;
		this.pagesNum = getPagesNum();
	}

	/**
	 * 获取总页数
	 * @return 总页数
	 */
	public int getPagesNum(){
		if(counts >0 && counts <=limit){
			return 1;
		}else{
			int temp = counts/limit;
			if(counts%limit !=0){
				return temp+1;
			}else{
				return temp;
			}
		}
	}

	/**
	 * 获取查询起始位置
	 * @param currentPage
	 */
	public int getStart(int currentPage){
		if(currentPage <= 1){
			return 0;
		}else{
			return (currentPage-1)*limit;
		}
	}

	/**
	 * 获取查询结束位置
	 * @param currentPage
	 */
	public int getEnd(int currentPage){
		System.out.println("###########currentPage:"+currentPage);
		System.out.println("###########pagesNum:"+pagesNum);
		if(currentPage == pagesNum){
			int yushu = counts%limit;
			System.out.println("###########yushu:"+yushu);

			int end = getStart(currentPage)+yushu;
			System.out.println("###########end:"+end);
			return end;
		}else{
			return getStart(currentPage)+limit;
		}

	}
}

3、pageTool.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="com.trade.commen.Calculator"%>
<%@page import="java.util.Map.Entry"%>

<%
	//功能**********************对内存中的集合进行分页**********************

	int start = 0;//起始位置
	int end = 1;//结束位置
	int limit = 10;//默认显示10条
	int pagesNum = 0;//总页数
	int currentPage = 1;//当前页
	int counts = 0;//总记录数
	String viewUrl = "supply_list.jsp";//显示分页结果的页面

	//=================获取参数==================
	if(request.getParameter("counts") != null && !request.getParameter("counts").equals("0")){
		counts = Integer.parseInt(request.getParameter("counts"));
	}
	if(request.getParameter("start") != null && !request.getParameter("start").equals("0")){
		start = Integer.parseInt(request.getParameter("start"));
	}
	if(request.getParameter("limit") != null && !request.getParameter("limit").equals("0")){
		limit = Integer.parseInt(request.getParameter("limit"));
	}
	if(request.getParameter("currentPage") != null && !request.getParameter("currentPage").equals("0")){
		currentPage = Integer.parseInt(request.getParameter("currentPage"));
	}
	if(request.getParameter("viewUrl") != null && !request.getParameter("viewUrl").equals("0")){
		viewUrl = request.getParameter("viewUrl");
	}

	Map criteria = (Map)request.getAttribute("criteria");
	String condition = "?";
	if(null != criteria && criteria.size() > 0){
		Iterator it = criteria.entrySet().iterator();
		while(it.hasNext()){
			Entry entry = (Entry)it.next();
			String paraName = entry.getKey().toString();
			String value = entry.getValue().toString();
			condition += paraName+"="+value+"&";
		}
	}
	viewUrl = viewUrl+condition;

	//===============显示分页工具条=================
	Calculator cal = new Calculator(limit,counts);
	pagesNum = cal.getPagesNum();
	if(pagesNum >= 1){
		//总记录
		out.print("Total:"+counts+"  ");
		//总页数
		out.print("Pages:"+cal.getPagesNum()+"   ");
		//首页
		out.print("<a href="+viewUrl+"start=0"+"&end="+cal.getEnd(1)+"&currentPage=1"+" >"+"First</a>  ");

		//上一页
		if(currentPage-1 > 0){
			out.print("<a href="+viewUrl+"start="+cal.getStart(currentPage-1)+"&end="+cal.getEnd(currentPage-1)+"&currentPage="+(currentPage-1)+" >"+" Previous </a>  ");
		}
		if(pagesNum <= 11){//pagesNum<=11
			for(int i=1;i<=pagesNum;i++){
				if(i == currentPage){
					out.print("<b> <a href="+viewUrl+"start="+cal.getStart(i)+"&end="+cal.getEnd(i)+"&currentPage="+i+" >"+i+"</a> </b>  ");
				}else{
					out.print("<a href="+viewUrl+"start="+cal.getStart(i)+"&end="+cal.getEnd(i)+"&currentPage="+i+" >"+i+"</a>  ");
				}
			}
		}else{//总页数大于11
			if(currentPage <= 6){
				for(int i=1;i<= 11;i++){//前11个
					if(i == currentPage){
						out.print("<b> <a href="+viewUrl+"start="+cal.getStart(i)+"&end="+cal.getEnd(i)+"&currentPage="+i+" >"+i+"</a> </b>  ");
					}else{
						out.print("<a href="+viewUrl+"start="+cal.getStart(i)+"&end="+cal.getEnd(i)+"&currentPage="+i+" >"+i+"</a>  ");
					}
				}
			}else if(currentPage > 6 && currentPage <= pagesNum-5){//当前页大于6小于尾页-5
				for(int i=currentPage-5;i< currentPage;i++){//当前页前5页
					if(i == currentPage){
						out.print("<b> <a href="+viewUrl+"start="+cal.getStart(i)+"&end="+cal.getEnd(i)+"&currentPage="+i+" >"+i+"</a> </b>  ");
					}else{
						out.print("<a href="+viewUrl+"start="+cal.getStart(i)+"&end="+cal.getEnd(i)+"&currentPage="+i+" >"+i+"</a>  ");
					}
				}
				for(int i=currentPage;i<=currentPage+5;i++){//当前页后5页
					if(i == currentPage){
						out.print("<b> <a href="+viewUrl+"start="+cal.getStart(i)+"&end="+cal.getEnd(i)+"&currentPage="+i+" >"+i+"</a> </b>  ");
					}else{
						out.print("<a href="+viewUrl+"start="+cal.getStart(i)+"&end="+cal.getEnd(i)+"&currentPage="+i+" >"+i+"</a>  ");
					}
				}
			}else if(currentPage > currentPage-5){
				for(int i=cal.getPagesNum()-10;i<=cal.getPagesNum();i++){
					if(i == currentPage){
						out.print("<b> <a href="+viewUrl+"start="+cal.getStart(i)+"&end="+cal.getEnd(i)+"&currentPage="+i+" >"+i+"</a> </b>  ");
					}else{
						out.print("<a href="+viewUrl+"start="+cal.getStart(i)+"&end="+cal.getEnd(i)+"&currentPage="+i+" >"+i+"</a>  ");
					}
				}
			}
		}

		//下一页
		if(currentPage+1 <= cal.getPagesNum()){
			out.print("<a href="+viewUrl+"start="+cal.getStart(currentPage+1)+"&end="+cal.getEnd(currentPage+1)+"&currentPage="+(currentPage+1)+" >"+" Next </a>  ");
		}

		//尾页
		out.print("<a href="+viewUrl+"start="+cal.getStart(cal.getPagesNum())+"&end="+cal.getEnd(cal.getPagesNum())+"&currentPage="+cal.getPagesNum()+" >Last"+"</a> ");
	}


%>