Java IP地址和整型之间的转化

public static long ip2int(String ip) {
    String[] items = ip.split("\\.");
    return Long.valueOf(items[0]) < < 24
            | Long.valueOf(items[1]) << 16
            | Long.valueOf(items[2]) << 8 | Long.valueOf(items[3]);
}

public static String int2ip(long ipInt) {
        StringBuilder sb = new StringBuilder();
        sb.append(ipInt & 0xFF).append(".");
        sb.append((ipInt >> 8) & 0xFF).append(".");
        sb.append((ipInt >> 16) & 0xFF).append(".");
        sb.append((ipInt >> 24) & 0xFF);
        return sb.toString();
}

 来源：http://orgcent.com/ip-address-integer-convert/