JAVA分頁實現（代碼）

package com.page;

public class PageUtil {

 // 每頁顯示的條數
 private int pageSize;
 // 總共的條數
 private int recordCount;
 // 當前頁面
 private int currentPage;

 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() {
  // 總條數/每頁顯示的條數=總頁數
  int size = recordCount / pageSize;
  // 最後一頁的條數
  int mod = recordCount % pageSize;
  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;
 }
}

 

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下面的代碼是放在jsp裏面的
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<%
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>
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