JSP通用分页程序（测试版）

最终效果图：



1.分页类：

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package cn.lingqi.tool;

import java.io.Serializable;
import java.util.ArrayList;

public class PageFunction implements Serializable{
private int page; //当前页码
private int totalCount; //总记录数
private int pageSie = 10; //每页条数
private int barSize = 10; //每bar显示页数

public PageFunction(){}
public PageFunction(int page, int totalCount, int pageSie, int barSize) {
super();
this.page = page;
this.totalCount = totalCount;
this.pageSie = pageSie;
this.barSize = barSize;
}

public int getBarSize() {
return barSize;
}

public void setBarSize(int barSize) {
this.barSize = barSize;
}

public int getPage() {
return page;
}

public void setPage(int page) {
this.page = page;
}

public int getPageSie() {
return pageSie;
}

public void setPageSie(int pageSie) {
this.pageSie = pageSie;
}

public int getTotalCount() {
return totalCount;
}

public void setTotalCount(int totalCount) {
this.totalCount = totalCount;
}

public ArrayList paging(){
int page = this.page;
if (page == 0){
page =1;
}
if (page == (getpageCount()+1)){
page = getpageCount();
}
int pageSize = this.pageSie;
int total = this.totalCount;
int barSize = this.barSize;
ArrayList mypa = new ArrayList();
int pageCount = (total-1)/pageSize+1;//总页数
int barPageCount = (pageCount-1)/barSize+1; //bar的总页数
int currentBar = (page-1)/barSize+1; //当前bar号
if (page == pageCount ||currentBar==barPageCount){//判断当前bar是否最后页 或 当前页是否最后页
int xx = pageCount%barSize ; //最后页bar记录数
int i = (page-1)/barSize; //获取前面N-1页bar数
for (int j=0;j<xx;j++){
mypa.add(barSize*i+(j+1)); //最后页bar的页码数
//mypa[j]=j;
}
}else{
int i = (page-1)/barSize; //获取前面N-1页bar数
for (int ii=0;ii<barSize;ii++){
mypa.add(barSize*i+(ii+1)); //最后页bar的页码数
}
}
return mypa;
}

public int getBarCount(){
int pageSize = this.pageSie;
int total = this.totalCount;
int pageCount = (total-1)/pageSize+1;//总页数
int barPageCount = (pageCount-1)/barSize+1; //bar的总页数
return barPageCount;
}

public int getpageCount(){
int pageSize = this.pageSie;
int total = this.totalCount;
int pageCount = (total-1)/pageSize+1;//总页数
return pageCount;
}

public int getCurrentBar(){ //获得当前页所在的bar号
int page = this.page;
int barSie = this.barSize;
return (page-1)/barSize+1;
}
}

2.实现分页的page.jsp：

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/tags/struts-logic" prefix="logic" %>
<%@ taglib uri="/tags/struts-bean" prefix="bean" %>
<table width="100%">
<tr>
<td><div align="right">
<logic:notEqual name="nowpage" value="1">
<a href="./newsOption.do?method=findpage&page=1&pageType=first">最前页</a>
</logic:notEqual>
<logic:notEqual name="currentBar" value="1">
<a href="./newsOption.do?method=findpage¤tBar=${currentBar}&barType=pre">上十页</a>
</logic:notEqual>
<logic:iterate id="mylist" name="pageList" scope="session">

<a href="./newsOption.do?method=findpage&page=<bean:write name="mylist"/>"> <font color='<logic:equal name="nowpage" value="${mylist}">red</logic:equal>'><bean:write name="mylist"/></font></a>
</logic:iterate>
<logic:notEqual name="currentBar" value="${barcount}">
<a href="./newsOption.do?method=findpage¤tBar=${currentBar}&barType=next">下十页</a>
</logic:notEqual>
<logic:notEqual name="nowpage" value="${pagecount}">
<a href="./newsOption.do?method=findpage&page=${pagecount}&pageType=last">最后页</a>
</logic:notEqual>
</div></td>
</tr>
</table>

3.第一次登陆调用的代码

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PageFunction pf = new PageFunction();
NewsFormDAO ndao = new NewsFormDAO();
pf.setTotalCount(ndao.newsCount());
pf.setPage(1);
ArrayList listNews = (ArrayList) ndao.queryPage(1, pf.getPageSie());
int currentBar = (pf.getPage()-1)/pf.getBarSize()+1;
session.setAttribute("currentBar",currentBar); //当前bar号
session.setAttribute("listNews", listNews);
session.setAttribute("pageList", pf.paging()); //当前bar中的页号列表
session.setAttribute("nowpage",1); //当前页号
session.setAttribute("barcount",pf.getBarCount()); //bar总页数
session.setAttribute("pagecount",pf.getpageCount()); //总页数

4.由page.jsp触发的代码

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public ActionForward findPage(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) {
HttpSession session = request.getSession();
PageFunction pf = new PageFunction();
NewsFormDAO ndao = new NewsFormDAO();
String currentBar = request.getParameter("currentBar");
String barType = request.getParameter("barType");
String pagetemp = request.getParameter("page");
String pageType = request.getParameter("pageType");
int nowCurrentBar= 0 ;
int page = 0;
pf.setTotalCount(ndao.newsCount());
if ("next".equals(barType)&&!"".equals(currentBar)){
page = Integer.parseInt(currentBar)*pf.getBarSize()+1;
nowCurrentBar = Integer.parseInt(currentBar)+1;
if (nowCurrentBar == pf.getBarCount()){
nowCurrentBar = pf.getBarCount();
}
}
if ("pre".equals(barType)&&!"".equals(currentBar)){
page = (Integer.parseInt(currentBar)-1)*pf.getBarSize();
nowCurrentBar = Integer.parseInt(currentBar)-1;
if (nowCurrentBar==1){
nowCurrentBar=1;
}
}
if (!"".equals(pagetemp)&&pagetemp!=null){
page = Integer.parseInt(pagetemp);
}
if ("first".equals(pageType)){
nowCurrentBar =1;
}
if ("last".equals(pageType)){
nowCurrentBar =pf.getBarCount();
}
pf.setPage(page);

if ((!"".equals(pageType)||pageType==null)&&(!"".equals(barType)||barType==null)){
nowCurrentBar = pf.getCurrentBar();
}
ArrayList listNews = (ArrayList) ndao.queryPage(page, pf.getPageSie());
session.setAttribute("listNews", listNews);
session.setAttribute("pageList", pf.paging());
session.setAttribute("currentBar", nowCurrentBar);
session.setAttribute("nowpage",page);
//int currentBar = (pf.getPage()-1)/pf.getBarSize()+1;
//session.setAttribute("currentBar",currentBar);
return mapping.findForward("pageList");

}