ie 火狐 谷歌 浏览器下载，文件名字乱码，空格，不兼容问题解决

1. String enableFileName ="";  
2. String agent = (String)request.getHeader("USER-AGENT");     
3.               if(agent != null && agent.indexOf("MSIE") == -1) {     
4.               enableFileName = "=?UTF-8?B?" + (new String (Base64.encodeBase64(filename.getBytes("UTF-8")))) + "?=";    
5.               response.setHeader("Content-Disposition", "attachment; filename=" + enableFileName);     
6.               }else {     
7.                // IE     
8.              enableFileName = new String(filename.getBytes("GBK"), "ISO-8859-1");     
9.                response.setHeader("Content-Disposition", "attachment; filename=" + enableFileName);   
10.   response.setContentType("application/x-msdownload");