Java判断IP是否在指定范围

2009-07-22 11:12

public class ipTest {
    /**
      * 判断IP是否在指定范围；
      */
    boolean i;
    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");
     }
}