jsp 分页查找算法

来源：互联网发布：php开发手册下载编辑：程序博客网时间：2024/05/18 08:12

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);}

底部页码：

<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>

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