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>