%> <script language="javascript" type=""> function fnKeydown(){ var key; var key=event.keyCode; switch(key){ case 68: window.location.href="test2.jsp?nextpage=<%=pageNum-1%>"; break; case 69: window.location.href="test2.jsp?nextpage=<%=pageNum+1%>"; break; }
{
if(list==null || list.size()<num)
{
throw new Exception("错误");
}
return list.get(num);
}
pageNum=0;
}else{
pageNum=Integer.parseInt(request.getParameter("nextpage"));
if(pageNum==-1){
pageNum=0;
}
System.out.println(pageNum);
}
%>
<script language="javascript" type="">
function fnKeydown(){
var key;
var key=event.keyCode;
switch(key){
case 68:
window.location.href="test2.jsp?nextpage=<%=pageNum-1%>";
break;
case 69:
window.location.href="test2.jsp?nextpage=<%=pageNum+1%>";
break;
}
}
document.onkeydown=fnKeydown;
</script>
<body bgcolor="#ffffff" )">
<table border="1">
<%
kt=(Kt)list2.get(pageNum);
%>
<tr>
<td></td>
<td><%=kt.getNr()%></td>
</tr>
</table>
为什么我的代码不行呢,test2.jsp是本页面,它用键盘控制,按D键,pageNum-1,按E键,pageNum+1,把pageNum传入 list.get(pageNum).
一个是list本身为空,
另一个是pageNum超出list的size你把这个
改成
if(list2==null)
{
out.println("list2为空");
}
else if(list2.size()<paegNum)
{
out.println("pageNum过大");
}
else
{
kt=(Kt)list2.get(pageNum);
}
kt=(Kt)list2.get(pageNum); 改成
if(list2==null)
{
out.println("list2为空");
}
else if(list2.size()<paegNum)
{
out.println("pageNum过大");
}
else
{
kt=(Kt)list2.get(pageNum);
}