byte 转 十六进制

 

StringBuilder str = new StringBuilder();for (int i = 0; i < b.length; i++) {int v = b[i] & 0xFF;String hv = Integer.toHexString(v);if (hv.length() < 2) {str.append(0);}if (i == b.length-1) {str.append(hv);} else {str.append(hv + " ");}}String errorMsg = "处理消息时，收到了未经解码的字节数组【" + str + "】";