jsp的有关问题，请各位高人帮俺看看，代码很短，不惹人烦

jsp的问题，请各位高人帮俺看看，代码很短，不惹人烦
<input   type= "hidden "   name= "arg1 "   value= "002 ">
<input   type= "hidden "   name= "arg2 "   value= "2 ">

<%

    String   param1=request.getParameter( "arg1 ");
    String   param2=request.getParameter( "arg2 ");

    out.println(param1);
    out.println(param2);
%>
结果输出为null，这是怎么回事？如何在jsp中获得控件的参数值谢谢

[解决办法]
a.jsp
<form action= "b.jsp " method=post>
<input type= "hidden " name= "arg1 " value= "002 ">
<input type= "hidden " name= "arg2 " value= "2 ">
</form>

b.jsp
<%

String param1=request.getParameter( "arg1 ");
String param2=request.getParameter( "arg2 ");

out.println(param1);
out.println(param2);
%>


[解决办法]
这当然是null

你可以用jstl标签 <c:set> 来设置一个参数

<c:out> 输出
[解决办法]
大哥，你的表单有没有提交啊，
request.getParameter( "arg1 ");这个要提交之后才能取到值的


<form name= "form1 " method= "post ">
<input type= "hidden " name= "arg1 " value= "002 ">
<input type= "hidden " name= "arg2 " value= "2 ">
<input name= "Submit " type= "Submit " value= "提交 ">
</form>

<%
if(request.getMethod().equals( "POST "))
{
String param1=request.getParameter( "arg1 ");
String param2=request.getParameter( "arg2 ");

out.println(param1);
out.println(param2);
}
%>
[解决办法]
同意楼上！
表单都没有，怎么提交？ 当然接收不到数据~~

建议楼主，还是多看看JSP方面的书籍！