java判断某个ip是否在一个网段内

最新推荐文章于 2025-03-19 10:36:11 发布

chengxu2011

最新推荐文章于 2025-03-19 10:36:11 发布

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package com.ip;

public class IpTest {
    public static void main(String[] args) {
        System.out.println(isInRange("192.168.1.127", "192.168.1.64/26"));
        System.out.println(isInRange("192.168.1.2", "192.168.0.0/23"));
        System.out.println(isInRange("192.168.0.1", "192.168.0.0/24"));
        System.out.println(isInRange("192.168.0.0", "192.168.0.0/32"));
    }
    public static boolean isInRange(String ip, String cidr) {
        String[] ips = ip.split("\\.");
        int ipAddr = (Integer.parseInt(ips[0]) << 24)
                | (Integer.parseInt(ips[1]) << 16)
                | (Integer.parseInt(ips[2]) << 8) | Integer.parseInt(ips[3]);
        int type = Integer.parseInt(cidr.replaceAll(".*/", ""));
        int mask = 0xFFFFFFFF << (32 - type);
        String cidrIp = cidr.replaceAll("/.*", "");
        String[] cidrIps = cidrIp.split("\\.");
        int cidrIpAddr = (Integer.parseInt(cidrIps[0]) << 24)
                | (Integer.parseInt(cidrIps[1]) << 16)
                | (Integer.parseInt(cidrIps[2]) << 8)
                | Integer.parseInt(cidrIps[3]);

        return (ipAddr & mask) == (cidrIpAddr & mask);
    }
}