用Java解码字符串中的base64部分

Question

I have encoded into base64 using the Java class built in. But when I try to decode I am having some issues. This code should explain what is happening:

String secondhalf=text.substring(text.length() / 3,text.length() / 3* 2);
byte[] secondhalfByte = secondhalf.getBytes();
secondhalf = Base64.getDecoder().decode(secondhalfByte);

I am getting the error:

cannot convert byte[] to String

What do I do?

Answer 1

To get an encoded string or a decoded byte[] use the following:

String secondhalf=text.substring(text.length() / 3,text.length() / 3* 2);

String encoded = Base64.getEncoder().encodeToString(secondhalf); 
byte[] decoded = Base64.getDecoder().decode(encoded);

So you either want to encode your 'secondhalf' into a encoded string or then decode that into a byte[]