JAVA中的GUID可以包含空格吗？

Question

我想了解JAVA中的GUID。 GUID是否可以包含空格？

我正在使用以下代码

import java.util.UUID;

UUID uuid = UUID.randomUUID();

String randomUUIDString = uuid.toString();

randomUUIDString可以包含空格吗？如果是的话有什么机会避免它？

Answer 1

没有。来自UUID.toString()

的文档

  

UUID字符串表示如此BNF所述：

   UUID                   = <time_low> "-" <time_mid> "-"
                             <time_high_and_version> "-"
                             <variant_and_sequence> "-"
                             <node>
    time_low               = 4*<hexOctet>
    time_mid               = 2*<hexOctet>
    time_high_and_version  = 2*<hexOctet>
    variant_and_sequence   = 2*<hexOctet>
    node                   = 6*<hexOctet>
    hexOctet               = <hexDigit><hexDigit>
    hexDigit               =
          "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
          | "a" | "b" | "c" | "d" | "e" | "f"
          | "A" | "B" | "C" | "D" | "E" | "F"

如您所见，返回字符串中的每个字符都是A-F，a-f，0-9或' - '中的字符。