byte[] buff = { 0x87, 0x00, 0x57, 0x01, 0x31, 0x33, 0x38, 0x30, 0x30, 0x31, 0x33, 0x38, 0x30,
                0x30, 0x30, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
                0x00, 0x3b, 0x02, 0x00, 0x20, 0x01, 0x00, 0x00, 0x00, 0x00, 0x1f, 0x12, 0x34, 0x56, 0x78,
                0xab, 0xcd, 0xef, 0x00, 0x00, 0x01, 0x30, 0x30, 0x37, 0x05, 0x81, 0x8d, 0x23, 0x02, 0x24,
                0x25, 0x04, 0x00, 0x19, 0x10, 0x1a, 0x41, 0x35, 0x2a, 0x25, 0x5b, 0x76, 0x5d, 0x8a, 0x34,
               0x3c, 0x11, 0x7f, 0x1e, 0x74, 0x43, 0x32, 0x39, 0x34, 0x46, 0x46, 0x37, 0x45, 0x47};
就是要转换成这种样子。。