java 分页

public class PageUtil {
    private int pageSize;//每页显示的条数
    private int recordCount;//总共的条数
    private int currentPage;//当前页面
    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() {
            int size = recordCount/pageSize;//总条数/每页显示的条数=总页数
            int mod = recordCount % pageSize;//最后一页的条数
            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;
        }
}

 --------------------------------------------
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>
-----------------------------------------------