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java.lang.NumberFormatException: null 大家帮个忙解决办法

热度:100   发布时间:2016-04-17 15:07:00.0
java.lang.NumberFormatException: null 大家帮个忙
这是我的代码
总出现上面的那个错误
late_edit.jsp
<%@   page   contentType= "text/html;   charset=gb2312 "   language= "java "   import= "java.sql.* "     %>
<%
  Connection   conn=null;
    try
{
              Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver ").newInstance();    
              conn=   DriverManager.getConnection( "jdbc:odbc:58bo ");
}catch(Exception   e)
{
              e.printStackTrace();
              out.println( "发生错误异常: "   +   e.getMessage());
        }
Statement   stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);  
%>
<html>
<head>
<meta   http-equiv= "Content-Type "   content= "text/html;   charset=gb2312 ">
<title> 无标题文档 </title>
<link   href= "../Css/style.css "   rel= "stylesheet "   type= "text/css ">
</head>

<%
String   del_id=request.getParameter( "del_id ");
if(del_id!= " ")
{del_id=Integer.parseInt(del_id);stmt.executeUpdate( "delete   from   late   where   自动编号= ' "+del_id+ " ' ");
response.sendRedirect( "late_list.jsp ");}

%>
<%
String   late_second=request.getParameter( "late_second ");
String   edit_id_ok=request.getParameter( "edit_id_ok ");
if(late_second!= " ")
{
stmt.executeUpdate( "update   late   set   栏目子类= ' "+late_second+ " '   where   自动编号= ' "+edit_id_ok+ " ' ");
stmt.executeUpdate( "update   info   set   栏目子类= ' "+late_second+ " '   where   栏目子类= ' "+request.getParameter( "late_hidden ")+ " ' ");
response.sendRedirect( "late_list.jsp ");
}
%>

<body> <%String   id=request.getParameter( "id ");%>
<table   border= "0 "   width= "100% "   cellspacing= "0 "   cellpadding= "3 "   class= "small ">
    <tr>  
        <td   class= "title1 "> <img   src= "../Images/icon/score.gif "   WIDTH= "16 "   HEIGHT= "16 "     align= "absmiddle "> <b>  
            </b> <b> 编辑栏目 </b> </td>
    </tr>
</table>
<hr   class= "hr1 "   >
<form   name= "thisform "   method= "post "   action= "late_edit.jsp?edit_id_ok= <%=id%> ">
    <table   width= "80% "   border= "0 "   align= "center "   cellpadding= "3 "   cellspacing= "1 "   bgcolor= "#000000 "   class= "small ">
        <tr>
            <td   width= "80 "   nowrap   class= "TableHeader "> 栏目大类 </td>
            <td   nowrap   class= "TableHeader "> 栏目子类 </td>
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