如何将 Mac 地址转换为十六进制并将其传递给 java 中的字节数组
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How to convert a Mac Address to a Hex and pass it to a bytearray in java
提问by Mr.Noob
How can i convert a MacAddress to a Hex String and then parse it to a byte in java? and similarly an IP Address as well?
如何将 MacAddress 转换为十六进制字符串，然后在 Java 中将其解析为字节？以及类似的 IP 地址？
Thank you
谢谢
回答by Ben Holland
A MAC address is already in hexadecimal format, it is of the form of 6 pairs of 2 hexadecimal digits.
MAC地址已经是16进制格式了，是6对2个16进制数字的形式。
String macAddress = "AA:BB:CC:DD:EE:FF";
String[] macAddressParts = macAddress.split(":");
// convert hex string to byte values
Byte[] macAddressBytes = new Byte[6];
for(int i=0; i<6; i++){
Integer hex = Integer.parseInt(macAddressParts[i], 16);
macAddressBytes[i] = hex.byteValue();
}
And...
和...
String ipAddress = "192.168.1.1";
String[] ipAddressParts = ipAddress.split("\.");
// convert int string to byte values
Byte[] ipAddressBytes = new Byte[4];
for(int i=0; i<4; i++){
Integer integer = Integer.parseInt(ipAddressParts[i]);
ipAddressBytes[i] = integer.byteValue();
}
回答by Sean F
The open-source IPAddress Java librarywill parse both MAC addresses and IP addresses, and convert to bytes in a polymorphic manner. Disclaimer: I am the project manager of that library.
开源的 IPAddress Java 库将解析 MAC 地址和 IP 地址，并以多态方式转换为字节。免责声明：我是那个图书馆的项目经理。
The following code will do what you are requesting:
以下代码将执行您的要求：
String ipv4Addr = "1.2.3.4";
String ipv6Addr = "aaaa:bbbb:cccc:dddd::";
String macAddr = "a:b:c:d:e:f";
try {
HostIdentifierString addressStrings[] = {
new IPAddressString(ipv4Addr),
new IPAddressString(ipv6Addr),
new MACAddressString(macAddr)
};
Address addresses[] = new Address[addressStrings.length];
for(int i = 0; i < addressStrings.length; i++) {
addresses[i] = addressStrings[i].toAddress();//parse
}
for(Address addr : addresses) {
byte bytes[] = addr.getBytes();
//convert to a list of positive Integer for printing
List<Integer> forPrinting = IntStream.range(0, bytes.length).map(idx -> 0xff & bytes[idx]).boxed().collect(Collectors.toList());
System.out.println("bytes for " + addr + " are " + forPrinting);
}
} catch(HostIdentifierException | IOException e) {
//e.getMessage has validation error
}
output:
输出：
bytes for 1.2.3.4 are [1, 2, 3, 4]
bytes for aaaa:bbbb:cccc:dddd:: are [170, 170, 187, 187, 204, 204, 221, 221, 0, 0, 0, 0, 0, 0, 0, 0]
bytes for 0a:0b:0c:0d:0e:0f are [10, 11, 12, 13, 14, 15]
