求助：jspSmartUpload处理下载时文件路径中的空格怎么处理？? 400 报错

我在使用SmartUpload处理下载是使用这个方法也不行，随后换了一个方法，使用

String path = request.getParameter("path").trim();
URLEncoder.encode(path,"UTF-8");
response.setContentType("application/octet-stream; CHARSET=utf8");
response.setHeader("Content-Disposition","attachment; filename="+path);

if (path == null) {
    response.setContentType("text/html; charset=UTF-8");
			response.getWriter().print("文件不存在,或者禁止下载!");
	return;
}
    InputStream inStream = new FileInputStream(path);
    response.reset();
    SmartUpload su = new SmartUpload();
    su.initialize(this.getServletConfig(), request, response);
    su.setContentDisposition(null);
    su.downloadFile(path);
    byte[] b = new byte[100];
    int len = 0;
    while ((len = inStream.read(b)) > 0) {
         response.getOutputStream().write(b, 0, len); 
    } 
    inStream.close();