java 判断ip是否属于一个网段
public class ipTest {
??? /**
???? * 判断IP是否在指定范围；
???? */
?????
??? public static boolean ipIsValid(String ipSection, String ip) {
??????? if (ipSection == null)
??????????? throw new NullPointerException("IP段不能为空！");
??????? if (ip == null)
??????????? throw new NullPointerException("IP不能为空！");
??????? ipSection = ipSection.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 (!ipSection.matches(REGX_IPB) || !ip.matches(REGX_IP))
??????????? return false;
??????? int idx = ipSection.indexOf('-');
??????? String[] sips = ipSection.substring(0, idx).split("\\.");
??????? String[] sipe = ipSection.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 static void main(String[] args) {
??????? if (ipIsValid("192.168.1.1-192.168.1.10", "192.168.3.54")) {
??????????? System.out.println("ip属于该网段");
??????? } else
??????????? System.out.println("ip不属于该网段");
??? }
}
