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 String fileName = "产品项目列表-" + DateUtils.format(new Date()) + ".xlsx";

1、

 response.setHeader("Content-disposition", "attachment;filename=" + java.net.URLEncoder.encode(fileName, "UTF-8"));

2、

 response.setHeader("Content-disposition", "attachment;filename=" + java.net.URLEncoder.encode(fileName, "UTF-8"));

3、有空格时 使用

String replaceStr = URLEncoder.encode(fileName, "utf-8").replace("\\+", "%20");
            // 组装contentDisposition的值
            String contentDispositionValue = "attachment; filename=" +
                    replaceStr +
                    "; filename*= utf-8''" +
                    replaceStr;
            response.setHeader("Content-disposition", contentDispositionValue);