java 下载/导出 文件名称 中文乱码问题

添加编码配置即可

response.setCharacterEncoding("UTF-8");
response.setHeader("Content-Disposition","attachment; filename*=UTF-8''" + URLEncoder.encode(fileName,"UTF-8") + ".png");

核心代码
filename*=UTF-8’’
URLEncoder.encode(fileName,“UTF-8”)