- JDK 自帶

- Commons Codec  地址：http://commons.apache.org/proper/commons-codec/download_codec.cgi

- Bouncy Castle 地址：https://www.bouncycastle.org/latest_releases.html

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import org.apache.commons.codec.binary.Base64;

public class Main3 {
 


    public static void main(String[] args) throws Exception{
        String str = "base64";
        byte[] bs = Base64.encodeBase64(str.getBytes());
        System.out.println(new String(bs));
        System.out.println(new String(Base64.decodeBase64(bs)));
        BASE64Encoder base64Encoder = new BASE64Encoder();
 

        String encode = base64Encoder.encode(str.getBytes());
        System.out.println(encode);
        BASE64Decoder base64Decoder = new BASE64Decoder();
        byte[] bytes = base64Decoder.decodeBuffer(encode);
        System.out.println(new String(bytes));

        byte[] encode1 = org.bouncycastle.util.encoders.Base64.encode(str.getBytes());
 

        System.out.println(new String(encode));
        byte[] decode = org.bouncycastle.util.encoders.Base64.decode(new String(encode1));
        System.out.println(new String(decode));
    }
}

YmFzZTY0
base64
YmFzZTY0
base64
YmFzZTY0
base64