java 根据给定的子网掩码和网关计算起始IP和结束IP

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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。

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();}
}