iputil.java

来自「cwbbs 云网论坛源码」· Java 代码 · 共 69 行

package com.cloudwebsoft.framework.util;

import java.net.UnknownHostException;
import java.net.InetAddress;



public class IPUtil {

    public static int str2Ip(String ip) {
        InetAddress address = null;
        try {
            address = InetAddress.getByName(ip); 
        }
        catch (UnknownHostException e) {
            e.printStackTrace();
            return 0;
        }
        byte[] bytes = address.getAddress(); 
        int a, b, c, d;
        a = byte2int(bytes[0]);
        b = byte2int(bytes[1]);
        c = byte2int(bytes[2]);
        d = byte2int(bytes[3]);
        int result = (a << 24) | (b << 16) | (c << 8) | d;
        return result;
    }

    public static int byte2int(byte b) {
        int l = b & 0x07f;
        if (b < 0) {
            l |= 0x80;
        }
        return l;
    }

    public static long ip2long(String ip) {
        int ipNum = str2Ip(ip);
        return int2long(ipNum);
    }

    public static long int2long(int i) {
        long l = i & 0x7fffffffL;
        if (i < 0) {
            l |= 0x080000000L;
        }
        return l;
    }

    public static String long2ip(long ip) {
        int[] b = new int[4];
        b[0] = (int) ((ip >> 24) & 0xff);
        b[1] = (int) ((ip >> 16) & 0xff);
        b[2] = (int) ((ip >> 8) & 0xff);
        b[3] = (int) (ip & 0xff);
        String x;
        Integer p;
        p = new Integer(0);
        x = p.toString(b[0]) + "." + p.toString(b[1]) + "." + p.toString(b[2]) +
            "." + p.toString(b[3]);

        return x;
    }

    

}