传值中的乱码

String fileName = new String(request.getParameter("fileName").getBytes("ISO-8859-1"),"GBK");
String cname = URLDecoder.decode(request.getParameter("cname"),"gbk");

response.setContentType("text/html"); 
		response.setCharacterEncoding("utf-8");
		PrintWriter out = response.getWriter();
		out.print(s+"\n"+s1+"\n"+s2+"\n"+s3);
		System.out.println(s+"\n"+s1+"\n"+s2+"\n"+s3);
		out.flush();
		out.close();