byte[] src = new byte[] { 122,-69, -17, 92, -76, 52, -21, -87, -10, 105, 76, -75, 98, 38, -78, -120, -119, -55, -113, 72, 40, -118, -85, -98, 84, -87 };

    //定义一个BASE64Encoder

    BASE64Encoder encode = new BASE64Encoder();

    //将byte[]转换为base64

    String base64 = encode.encode(src);

    System.err.println(base64);

    //新建一个BASE64Decoder

    BASE64Decoder decode = new BASE64Decoder();

    //将base64转换为byte[]

    byte[] b = decode.decodeBuffer(base64);

    System.err.println(Arrays.toString(b));

    System.err.println(Arrays.toString(src));

    String srcString=Arrays.toString(src);

    System.err.println(srcString);