解决乱码问题~!传值中文不成功`!请老鸟指教`!

//String submit= request.getParameter("Submit");
   String submit=new String(request.getParameter("submit").getBytes("iso-8859-1"),"gbk");
         
        if(submit.equals("注册")){
           
            response.sendRedirect("jsp2.jsp");
        }else{
            response.sendRedirect("jsp3.jsp");
        }
在JSP页面中定义的value="注册"
运行后报个500错误~!请老鸟给小弟看看~!
小弟在此谢过`!!!