问题是你正在返回调用 Base64.encodeBase64(bytes) 的 toString()code> 返回一个字节数组.所以你最后得到的是一个字节数组的默认字符串表示，它对应你得到的输出.

The problem is that you are returning the toString() of the call to Base64.encodeBase64(bytes) which returns a byte array. So what you get in the end is the default string representation of a byte array, which corresponds to the output you get.

相反，您应该这样做:

encodedfile = new String(Base64.encodeBase64(bytes), "UTF-8");