jsp 分页查找算法

首先我们要对页面需要的参数进行初始化，包括 每页行数 总行数 总页数 当前页，在jsp中插入如下代码

String classname="com.danale.content.Partnersinf";
		
		CheckObject co = new CheckObject();
	
		String select=request.getParameter("select");
		String condition=request.getParameter("condition");
		if(select=="")select=null;
		if(condition=="")condition=null;		//以上用于搜索
		
		int pagesize=10;//每页行数
		int total=0;//总行数
		
			
		if(select!=null&&condition!=null)
		{
		
		total=co.SerchObjectCount(classname,select,condition);
		
		}else
		{
		total=co.getObjectSize(classname);
		}
		//计算total 总行数 根据是不是搜索有不同
		System.out.println("total="+total);
		
		int pagenum=(total+pagesize-1)/pagesize;
		if(pagenum<1)
			pagenum=1;		//计算总页数
 int pagenow=1;//当前页
if(request.getParameter("pagenow")!=null)
{
int n=Integer.parseInt(request.getParameter("pagenow"));
if(1<=n&&n<=pagenum)
pagenow=n;
}

List list=null;
if(select!=null&&condition!=null)//根据是不是搜索要得到的结果有所不同。
{
list=co.SerchObject(classname,(pagenow-1)*pagesize,pagesize,select,condition);
}
else{
list=co.getObject(classname,(pagenow-1)*pagesize,pagesize);
}

<ul class="page_info">
					
					<%
					int pre=pagenow-1;
					int next=pagenow+1;
					if(pre<1)pre=1;
					if(next>pagenum)next=pagenow;
					%>
					
 <li><a href="?pagenow=1<%if(select!=null&&condition!=null)out.print("&select="+select+"&condition="+condition);%>"><img src="images/arrow_leftend_off.png"></img></a></li>
  <li><a href="?pagenow=<%=pre%><%if(select!=null&&condition!=null)out.print("&select="+select+"&condition="+condition);%>"> <img src="images/arrow_left_off.png"></img></a></li>
				     
				     <%
				    	int begain=0;
				     	int end=0;
				    if(pagenum<=5)//页数不足5
				    {				    	
				    	begain=1;
				    	end=pagenum;
				    }
				    else//页数大于5
				     {				     	
				     	if(pagenow>=3&&pagenow<=pagenum-3)
				     	{
				     		begain=pagenow-2;
				     		end=pagenow+2;
				     	}
				     	else if(pagenow<3)
				     	{
				     		begain=1;
				     		end=5;
				     	
				     	}else if(pagenow>pagenum-3)
				     	{
				     		begain=pagenum-4;
				     		end=pagenum;
				     	
				     	}
				     
				     }
				     
				     for(int i=begain;i<=end;i++)
				    	{
				    		
	%><li  class="page_num"><a <%if(i==pagenow)out.print("style=‘color:red;‘");%> href="?pagenow=<%=i%><%if(select!=null&&condition!=null)out.print("&select="+select+"&condition="+condition);%>"><%=i%></a></li>
							<%									    
				    		
				    	}
				     %>
				     
				    
				    
				    
				     
 <li><a href="?pagenow=<%=next%><%if(select!=null&&condition!=null)out.print("&select="+select+"&condition="+condition);%>"><img src="images/arrow_right_off.png"/></a></li>
  <li><a href="?pagenow=<%=pagenum%><%if(select!=null&&condition!=null)out.print("&select="+select+"&condition="+condition);%>"><img src="images/arrow_rightend_off.png"/></a></li>
				</ul>

jsp 分页查找算法,古老的榕树,5-wow.com