response.setCharacterEncoding("UTF-8");
response.setContentType("multipart/form-data");
response.setHeader("Content-Disposition",
"attachment;fileName*=UTF-8''" + UriUtils.encode(fileName, "UTF-8"));
重点是fileName*=UTF-8'' 和UriUtils.encode，UriUtils使用的是spring包的org.springframework.web.util.UriUtils
以上
