Java分页代码

package  com.hjf.web.view;

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