String userAgent = request.getHeader("user-agent").toLowerCase();          if (userAgent.contains("msie") || userAgent.contains("like gecko") ) {                    // win10 ie edge 浏览器 和其他系统的ie                fileName =  URLEncoder.encode(fileName,"UTF-8");              fileName = fileName.replaceAll("\\+", "%20").replaceAll( "\\(","%28").replaceAll( "\\)","%29").replaceAll( ";","%3B").replaceAll( "@","%40").replaceAll( "\\#","%23").replaceAll( "\\&","%26").replaceAll( "\\,","%2C");          } else {                    // fe                fileName = new String(fileName.getBytes("utf-8"), "ISO-8859-1");            }                response.addHeader("Content-Disposition", "attachment;filename="+ fileName);

文件名转换的方法要放对地方，放在返回文件下载信息里。