片后缀格式怎么改，如何更改片后缀

截取对象里图片路径的后缀名 int index = dto.getStuIdCardImgZ().lastIndexOf(“.”); char[] ch = dto.getStuIdCardImgZ().toCharArray(); String IdCardSuffixZ = String.copyValueOf(ch, index+1, ch.length – index -美国高防vps 1); 截取文件后缀请参考： https://blog.csdn.net/a15044774767/article/details/53186206 17394922