Java分页实现代码详解编程语言

package com.page; 
 
public class PageUtil { 
 
 // 每页显示的条数 
 private int pageSize; 
 // 总共的条数 
 private int recordCount; 
 // 当前页面 
 private int currentPage; 
 
 public PageUtil(int pageSize, int recordCount, int currentPage) { 
  this.pageSize = pageSize; 
  this.recordCount = recordCount; 
  setCurrentPage(currentPage); 
 } 
 
 // 构造方法 
 public PageUtil(int pageSize, int recordCount) { 
  this(pageSize, recordCount, 1); 
 } 
 
 // 总页数 
 public int getPageCount() { 
  // 总条数/每页显示的条数=总页数 
  int size = recordCount / pageSize; 
  // 最后一页的条数 
  int mod = recordCount % pageSize; 
  if (mod != 0) 
   size++; 
  return recordCount == 0 ? 1 : size; 
 } 
 
 // 包含，起始索引为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); 
 } 
 
 // 得到当前页 
 public int getCurrentPage() { 
  return currentPage; 
 } 
 
 // 设置当前页 
 public void setCurrentPage(int currentPage) { 
  int validPage = currentPage <= 0 ? 1 : currentPage; 
  validPage = validPage > getPageCount() ? getPageCount() : validPage; 
  this.currentPage = validPage; 
 } 
 
 // 得到每页显示的条数 
 public int getPageSize() { 
  return pageSize; 
 } 
 
 // 设置每页显示的条数 
 public void setPageSize(int pageSize) { 
  this.pageSize = pageSize; 
 } 
 
 // 得到总共的条数 
 public int getRecordCount() { 
  return recordCount; 
 } 
 
 // 设置总共的条数 
 public void setRecordCount(int recordCount) { 
  this.recordCount = recordCount; 
 } 
}

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下面的代码是放在jsp里面的

———————————————————————————————————————————-

<% 
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(); 
%>

———–下面这个是放在有变量的上面——————————————————————————————-

<% 
for (int i = pUtil.getFromIndex(); i < pUtil.getToIndex(); i++) { 
PublisherModel model = (PublisherModel) records.get(i); 
%> 
中间是删除修改之类的代码 
<%}%>

————这个是结尾的———————————————————————————————————-

<tr><td width=100% bgcolor="#eeeeee" colspan=4 align="center"> 
记录总数<%=pUtil.getRecordCount()%>条 当前页/总页数<%=currentPage%> 
/<%=pUtil.getPageCount()%>每页显示<%=pUtil.getPageSize()%>条 
<a href="publishers.jsp?page=1">首页</a> 
<a href="publishers.jsp?page=<%=(currentPage - 1)%>">上页</a> 
<a href="publishers.jsp?page=<%=(currentPage + 1)%>">下页</a> 
<a href="publishers.jsp?page=<%=pUtil.getPageCount()%>">末页</a> 
</td></tr>