Java中MAC地址到长整型数值的转换教程

String macAddress = "e8:9f:6d:d3:1c:0e";
String[] macAddressParts = macAddress.split(":");
String macAddressString = "";

for (int i = 0; i < 6; i++) {
    Integer hex = Integer.parseInt(macAddressParts[i], 16); // 将十六进制部分转换为十进制整数
    macAddressString += hex.toString(); // 将十进制整数转换为字符串并拼接
}
System.out.println("错误的拼接结果: " + macAddressString);
// 输出示例: 错误的拼接结果: 2321591092112814

public class MacAddressConverter {

    public static void main(String[] args) {
        String macAddress = "e8:9f:6d:d3:1c:0e"; // 示例MAC地址

        long addressAsInteger = convertMacToLong(macAddress);
        System.out.println("MAC地址: " + macAddress);
        System.out.println("转换为长整型: " + addressAsInteger);
        // 预期输出: 转换为长整型: 255771439995918
    }

    /**
     * 将MAC地址字符串转换为长整型数值。
     *
     * @param macAddress MAC地址字符串，例如 "e8:9f:6d:d3:1c:0e"
     * @return 转换后的长整型数值
     * @throws IllegalArgumentException 如果MAC地址格式不正确
     */
    public static long convertMacToLong(String macAddress) {
        if (macAddress == null || macAddress.isEmpty()) {
            throw new IllegalArgumentException("MAC地址不能为空。");
        }

        String[] macAddressParts = macAddress.split(":");
        if (macAddressParts.length != 6) {
            throw new IllegalArgumentException("MAC地址格式不正确，应包含6个部分。");
        }

        long result = 0;
        for (int i = 0; i < 6; i++) {
            try {
                // 将每个十六进制部分转换为十进制整数
                // Integer.parseInt(String s, int radix) 方法用于将指定基数（radix）的字符串解析为有符号整数。
                Integer hex = Integer.parseInt(macAddressParts[i], 16);

                // 核心逻辑：累加并左移（乘以256）
                result = result * 256 + hex;
            } catch (NumberFormatException e) {
                throw new IllegalArgumentException("MAC地址部分 '" + macAddressParts[i] + "' 不是有效的十六进制数。", e);
            }
        }
        return result;
    }
}