Java判断IP是否在指定网段中,看代码
- /**
- * 判断ip是否在指定网段中
- * @author dh
- * @param iparea
- * @param ip
- * @return boolean
- */
- public static boolean ipIsInNet(String iparea, String ip) {
- if (iparea == null)
- throw new NullPointerException("IP段不能为空!");
- if (ip == null)
- throw new NullPointerException("IP不能为空!");
- iparea = iparea.trim();
- ip = ip.trim();
- final String REGX_IP = "((25[0-5]|2[0-4]//d|1//d{2}|[1-9]//d|//d)//.){3}(25[0-5]|2[0-4]//d|1//d{2}|[1-9]//d|//d)";
- final String REGX_IPB = REGX_IP + "//-" + REGX_IP;
- if (!iparea.matches(REGX_IPB) || !ip.matches(REGX_IP))
- return false;
- int idx = iparea.indexOf('-');
- String[] sips = iparea.substring(0, idx).split("//.");
- String[] sipe = iparea.substring(idx + 1).split("//.");
- String[] sipt = ip.split("//.");
- long ips = 0L, ipe = 0L, ipt = 0L;
- for (int i = 0; i < 4; ++i) {
- ips = ips << 8 | Integer.parseInt(sips[i]);
- ipe = ipe << 8 | Integer.parseInt(sipe[i]);
- ipt = ipt << 8 | Integer.parseInt(sipt[i]);
- }
- if (ips > ipe) {
- long t = ips;
- ips = ipe;
- ipe = t;
- }
- return ips <= ipt && ipt <= ipe;
- }
- 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);
- }
- }