jsp分页代码之pageUtil类

pageUtil类负责得到每页的开始数和结束数

package control;

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();
%>

　　下面的代码是放在变量的上面

<%
for (int i = pUtil.getFromIndex(); i < pUtil.getToIndex(); i++) {
PublisherModel model = (PublisherModel) records.get(i);

out.print("<TD>"+model.getA()+"</TD>");
out.print("<TD>"+model.getB()+"</TD>");

%>
中间是显示的代码
<%}%>

　　

----------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="showTodolist.jsp?page=1">首页</a>
<a href="showTodolist.jsp?page=<%=(currentPage - 1)%>">上页</a>
<a href="showTodolist.jsp?page=<%=(currentPage + 1)%>">下页</a>
<a href="showTodolist.jsp?page=<%=pUtil.getPageCount()%>">末页</a>
</td></tr>