分布工具类的定义与实现及测试。
package d5.util;public class PageUtil {private int pageSize;//一页有多少条private int currIndex;//当前是第几页private int totalCount;//共有多少条记录 谁给我？ 逻辑层的 getTotalCountprivate int totalPage;//共有多少页 private int start;//显时时开始的位置//构造方法时，需要提供什么参数 一页多少个，当前第几页，一共多少条public PageUtil(int pageSize, int currIndex, int totalCount) { this.pageSize = pageSize;this.currIndex = currIndex;this.totalCount = totalCount;currIndex=currIndex<1?1:currIndex;//如果当前页小于1，则为1 currIndex=currIndex>totalPage?totalPage:currIndex;//如果当前页大于总页数 start=(currIndex-1)*pageSize;//开始的位置=（当前页-1）*一页的数totalPage=totalCount%pageSize==0?totalCount/pageSize:totalCount/pageSize+1;}public int getPageSize() {return pageSize;}public int getCurrIndex() {return currIndex;}public int getTotalCount() {return totalCount;}public int getTotalPage() {return totalPage;}public int getStart() {return start;}@Overridepublic String toString() {return "PageUtil [pageSize=" + pageSize + ", currIndex=" + currIndex + ", totalCount=" + totalCount+ ", totalPage=" + totalPage + ", start=" + start + ", toString()=" + super.toString() + "]";}}
testZhiDingWeizhi4.jsp
<%@page import="d5.biz.IAdminuserBiz"%>
<%@page import="d5.biz.AdminuserBiz"%>
<%@page import="d5.entity.Adminuser"%>
<%@page import="java.util.*"%>
<%@page import="d5.util.*"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
String page1=request.getParameter("page");
int num = 0;
if(page1==null)num =1;
elsenum = Integer.parseInt(page1);
if(num==0)num=1;Adminuser u= new Adminuser(0,"","");
IAdminuserBiz ab=new AdminuserBiz();
List<Adminuser> list=new ArrayList<Adminuser>();
int count=ab.getTotalCount();
PageUtil pageUtil=new PageUtil(3,num,count);
list=ab.getUsersByPage(pageUtil.getStart(), pageUtil.getPageSize());
for(Adminuser user:list){out.println(user+"<br>");
}%>
<a href="testZhiDingWeizhi4.jsp?page=1">第一页</a><br><a href="testZhiDingWeizhi4.jsp?page=<%=pageUtil.getCurrIndex()-1%>">上一页</a><br>
<a href="testZhiDingWeizhi4.jsp?page=<%=pageUtil.getCurrIndex()+1%>">下一页</a><br><a href="testZhiDingWeizhi4.jsp?page=<%=pageUtil.getTotalPage() %>">最后一页</a><br>
</body>
</html>