java 根据给定的子网掩码和网关计算起始IP和结束IP

小七蒙恩2024-09-02 19:28

java 根据给定的子网掩码和网关计算起始IP和结束IP

以下是一个Java工具类，用于根据给定的子网掩码和网关计算起始IP和结束IP。

java 复制代码

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

public class IPUtils {
    public static void main(String[] args) {
        try {
            String subnetMask = "255.255.255.0";
            String gateway = "192.168.1.1";
            String startIp = calculateStartIp(subnetMask, gateway);
            String endIp = calculateEndIp(subnetMask, gateway);

            System.out.println("Start IP: " + startIp);
            System.out.println("End IP: " + endIp);
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }

    public static String calculateStartIp(String subnetMask, String gateway) throws UnknownHostException {
        byte[] subnetMaskBytes = InetAddress.getByName(subnetMask).getAddress();
        byte[] gatewayBytes = InetAddress.getByName(gateway).getAddress();

        byte[] startIpBytes = new byte[4];
        for (int i = 0; i < 4; i++) {
            startIpBytes[i] = (byte) (gatewayBytes[i] & subnetMaskBytes[i]);
        }

        return InetAddress.getByAddress(startIpBytes).getHostAddress();
    }

    public static String calculateEndIp(String subnetMask, String gateway) throws UnknownHostException {
        byte[] subnetMaskBytes = InetAddress.getByName(subnetMask).getAddress();
        byte[] gatewayBytes = InetAddress.getByName(gateway).getAddress();

        byte[] endIpBytes = new byte[4];
        for (int i = 0; i < 4; i++) {
            endIpBytes[i] = (byte) ((gatewayBytes[i] & subnetMaskBytes[i]) | (subnetMaskBytes[i] ^ 255));
        }

        return InetAddress.getByAddress(endIpBytes).getHostAddress();
    }
}

使用上述工具类，您可以通过修改subnetMask和gateway变量来计算起始IP和结束IP。