java 遍历打印ip 0.0.0.0 -255.255.255.255，不包含保留地址

如果你希望在Java中遍历和打印从0.0.0.0到255.255.255.255的IP地址范围，但不包括保留地址，可以使用以下代码示例：

import java.net.InetAddress;
import java.net.UnknownHostException;

public class IPTraversal {
   
    public static void main(String[] args) {
   
        try {
   
            long start = ipToLong("0.0.0.0");
            long end = ipToLong("255.255.255.255");

            for (long i = start; i <= end; i++) {
   
                String ipAddress = longToIp(i);
                if (!isReservedIP(ipAddress)) {
   
                    System.out.println(ipAddress);
                }
            }
        } catch (UnknownHostException e) {
   
            e.printStackTrace();
        }
    }

    public static long ipToLong(String ipAddress) throws UnknownHostException {
   
        InetAddress inetAddress = InetAddress.getByName(ipAddress);
        byte[] addressBytes = inetAddress.getAddress();
        long result = 0;

        for (byte octet : addressBytes) {
   
            result <<= 8;
            result |= octet & 0xff;
        }

        return result;
    }

    public static String longToIp(long ip) {
   
        StringBuilder ipAddress = new StringBuilder();

        for (int i = 3; i >= 0; i--) {
   
            ipAddress.append((ip >> (i * 8)) & 0xff);

            if (i > 0) {
   
                ipAddress.append(".");
            }
        }

        return ipAddress.toString();
    }

    public static boolean isReservedIP(String ipAddress) {
   
        try {
   
            long ip = ipToLong(ipAddress);

            // 检查私有地址范围和回环地址范围
            if ((ip >= ipToLong("10.0.0.0") && ip <= ipToLong("10.255.255.255"))
                    || (ip >= ipToLong("172.16.0.0") && ip <= ipToLong("172.31.255.255"))
                    || (ip >= ipToLong("192.168.0.0") && ip <= ipToLong("192.168.255.255"))
                    || (ip == ipToLong("127.0.0.1"))) {
   
                return true;
            }
        } catch (UnknownHostException e) {
   
            e.printStackTrace();
        }

        return false;
    }
}

上述代码在遍历IP地址时，在打印之前通过 isReservedIP 方法检查是否为保留地址。如果是保留地址，则跳过打印步骤。

请注意，这个操作仍然需要相当长的时间才能完成，因为涉及到了大量的IP地址范围。