spring 网址保存为快捷桌面图标

[张三工]

@RequestMapping("/desktop.url")
	public void createDeskTop(Map<String, Object> map, HttpServletRequest request,HttpServletResponse response) throws IOException{		
		System.out.print(CommonUtil.getSiteName());
		PrintWriter out = response.getWriter();
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-Control", "No-cache");
		response.setDateHeader("Expires", 0);
		response.setContentType("application/octet-stream");	
		response.setCharacterEncoding("utf-8");
		response.addHeader("Content-Disposition","attachment; filename="+CommonUtil.getSiteName()+".url");
		out.println("[DEFAULT]");
		out.println("BASEURL=http://"+CommonUtil.getSiteUrl()+"/?desk");
		out.println("[InternetShortcut]");
		out.println("URL=http://"+CommonUtil.getSiteUrl()+"/?desk");
		out.println("IconFile=http://"+CommonUtil.getSiteUrl()+"/favicon.ico");
		out.println("IconIndex=1");
		out.flush();
		out.close();
	}

为什么当filename为中文时返回为空呢(中文字符被替换成空格)？
且IE6下，不能下载。说请求的站点不可用。(是不是输出完了，直接就关闭了输出流，导致不能下载？)