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 getTotalCount
private 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) {
currIndex=currIndex<1?1:currIndex;//如果当前页小于1，则为1
this.pageSize = pageSize;
this.currIndex = currIndex;
this.totalCount = totalCount;
totalPage=totalCount%pageSize==0?totalCount/pageSize:totalCount/pageSize+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
}
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;
}
@Override
public 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;
else
num = 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>