package com.hjf.web.view;
public class PageUtil {
private int pageSize;//每頁顯示的條數 private int recordCount;//總共的條數 private int currentPage;//當前頁面
public PageUtil(int pageSize, int recordCount, int currentPage) {
this.pageSize = pageSize; this.recordCount = recordCount; setCurrentPage(currentPage);
} //構造方法 public PageUtil(int pageSize, int recordCount) { this(pageSize, recordCount, 1); } //總頁數 public int getPageCount() { int size = recordCount/pageSize;//總條數/每頁顯示的條數=總頁數 int mod = recordCount % pageSize;//最後一頁的條數 if(mod != 0) size++; return recordCount == 0 ? 1 : size; } //包含，起始索引爲0 public int getFromIndex() { //System.out.println("from index:"+(currentPage-1) * pageSize); return (currentPage-1) * pageSize; } //不包含 public int getToIndex() { //System.out.println("to index:"+Math.min(recordCount, currentPage * pageSize)); return Math.min(recordCount, currentPage * pageSize); } //得到當前頁 public int getCurrentPage() { return currentPage; }//設置當前頁 public void setCurrentPage(int currentPage) { int validPage = currentPage <= 0 ? 1 : currentPage; validPage = validPage > getPageCount() ? getPageCount() : validPage; this.currentPage = validPage; }//得到每頁顯示的條數 public int getPageSize() { return pageSize; }//設置每頁顯示的條數 public void setPageSize(int pageSize) { this.pageSize = pageSize; }//得到總共的條數 public int getRecordCount() { return recordCount; }//設置總共的條數 public void setRecordCount(int recordCount) { this.recordCount = recordCount; }
} --------------------------------------------
下面的代碼是放在jsp裏面的
--------------------------------------------
<%
PublishersDAO dao = PublishersDAO.getInstance();
List records = dao.getModels();
String pageStr = request.getParameter("page");
int currentPage = 1;
if (pageStr != null)
currentPage = Integer.parseInt(pageStr);
PageUtil pUtil = new PageUtil(10, records.size(), currentPage);
currentPage = pUtil.getCurrentPage();
%>
-----------下面這個是放在有變量的上面---------------------------------
<%
for (int i = pUtil.getFromIndex(); i < pUtil.getToIndex(); i++) {
PublisherModel model = (PublisherModel) records.get(i);
%>
中間是刪除修改之類的代碼
<%}%>
------------這個是結尾的--------------------------
<tr><td width=100% bgcolor="#eeeeee" colspan=4 align="center">
記錄總數<%=pUtil.getRecordCount()%>條 當前頁/總頁數<%=currentPage%>
/<%=pUtil.getPageCount()%>每頁顯示<%=pUtil.getPageSize()%>條
<a href="publishers.jsp?page=1">首頁</a>
<a href="publishers.jsp?page=<%=(currentPage - 1)%>">上頁</a>
<a href="publishers.jsp?page=<%=(currentPage + 1)%>">下頁</a>
<a href="publishers.jsp?page=<%=pUtil.getPageCount()%>">末頁</a>
</td></tr>
-----------------------------------------------
