struts2分页类

话不多说..直接贴代码...

下载地址:http://download.youkuaiyun.com/detail/zouhao619/4553604

PagerUtil.java:

package com.zpass.util;
import org.apache.struts2.ServletActionContext;

import com.zpass.action.CommonAction;
/*
 * 分页类  亲自手写
 */
public class PagerUtil {
	private long Start=0;//起始数
	private long End;//结束数
	private int ListPage=20;//每页显示数
	private String Parameter="p";//页数跳转时要带的参数
	private long Count;//总数
	private int CurrentPage=1;//当前页
	private int TotalPages;//总页数
	private int ListNumber=5;//前后显示多少
	private String Url;
	public long getStart() {
		return Start;
	}
	public int getListPage() {
		return ListPage;
	}
	private void CalculatePage(int currentPage)
	{
		if(currentPage<=1)
			this.CurrentPage=1;
		else
			this.CurrentPage=currentPage;
		this.Start=(this.CurrentPage-1)*this.ListPage;
		this.End=this.Start+this.ListPage;
	}
	private void SetTotalPages()
	{
		if(this.Count%this.ListPage==0)
			this.TotalPages=(int) (this.Count/this.ListPage);
		else
			this.TotalPages=(int) (this.Count/this.ListPage+1);
	}
	//保持其他参数同步
	private void GetParameter()
	{
		Url=ServletActionContext.getRequest().getQueryString();
		//如果没有参数
		if(Url==null){
			Url=ServletActionContext.getRequest().getRequestURI()+"?";//获取当前页面地址
		}else{
			//如果参数(不只p,还有其他参数)
			if(Url.indexOf("p=")>0){
				Url=Url.substring(0,Url.indexOf("&p="));
				Url=ServletActionContext.getRequest().getRequestURI()+"?"+Url+"&";
			}else{
				Url=ServletActionContext.getRequest().getRequestURI()+"?";//获取当前页面地址
			}
		}
	}
	//开始分页
	public String ShowPager(long count)
	{
		this.GetParameter();
		this.Count=count;
		if(ServletActionContext.getRequest().getParameter(this.Parameter)!=null){
			this.CalculatePage(Integer.parseInt(ServletActionContext.getRequest().getParameter(this.Parameter)));
		}else{
			this.CalculatePage(1);
		}
		this.SetTotalPages();
		String Page=this.Count+"  条记录  ";
		Page=Page+this.CurrentPage+"/"+this.TotalPages+" 页";
		String a_class="class='number'";
		String current="class='number current'";
		if(this.CurrentPage-this.ListNumber>0){
			Page=Page+"  <a href='"+Url+this.Parameter+"=1' "+current+">第一页</a>";
			Page=Page+"  <a href='"+Url+this.Parameter+"="+(int)(this.CurrentPage-this.ListNumber)+"' "+current+">前"+this.ListNumber+"页</a>";
		}
		if(this.CurrentPage>1)
			Page=Page+"  <a href='"+Url+this.Parameter+"="+(int)(this.CurrentPage-1)+"' "+current+">上一页</a>";
		if(this.CurrentPage<this.TotalPages)
			Page=Page+"  <a href='"+Url+this.Parameter+"="+(int)(this.CurrentPage+1)+"' "+current+">下一页</a>";
		if(this.CurrentPage>1){
			String PageVo="";
			for(int i=this.CurrentPage-1;i>this.CurrentPage-this.ListNumber;i--){
				if(i<1)
					break;
				PageVo="<a href='"+Url+this.Parameter+"="+i+"' "+a_class+">"+i+"</a>"+PageVo;
			}
			Page=Page+PageVo;
		}
		if(this.CurrentPage<=this.TotalPages && this.TotalPages!=1){
			for(int i=this.CurrentPage;i<this.CurrentPage+this.ListNumber;i++){
				if(i==this.CurrentPage){
					Page=Page+"<a href='#' "+current+">"+i+"</a>";
					continue;
				}
				if(i>this.TotalPages)
					break;
				Page=Page+"<a href='"+Url+this.Parameter+"="+i+"' "+a_class+">"+i+"</a>";
			}
		}
		if(this.CurrentPage+this.ListNumber<this.TotalPages)
		{
			Page=Page+"  <a href='"+Url+this.Parameter+"="+(int)(this.CurrentPage+this.ListNumber)+"' "+current+">后"+this.ListNumber+"页</a>";
			Page=Page+"  <a href='"+Url+this.Parameter+"="+this.TotalPages+"' "+current+">最后一页</a>";
		}
		return Page;
	}
}

有了这个分页类...

我们在action就这么调用就可以了

PagerUtil pager=new PagerUtil();

//这里是计算表中的总数(我自己写的dao层,请对号入座,这里直接复制没用)

int count=userService.getCommonDao().table("User").Count();String page=pager.ShowPager(count);

//这里是获取返回的List(我自己写的service层,请对号入座,这里直接复制没用)

List<User> list=this.userService.getCommonDao().table("User").order("id desc").limit((int)pager.getStart(),CommonAction.config.getPAGE_LISTPAGE()).select();

//这里是我将list和page返回给Jsp,你也可以不这样做

Map<String,Object> request = (Map)ActionContext.getContext().get("request");
request.put("page",page);
request.put("list",list);

那么在Jsp层显示的话就是

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <body>
    <s:iterator value="#request.list" id="vo">
  		${vo.username }
    </s:iterator>
    ${request.page}
  </body>
</html>