mysql> select inet_aton('192.168.0.1');
+--------------------------+
| inet_aton('192.168.0.1') |
+--------------------------+
| ? ? ? ? ? ? ? 3232235521 |
+--------------------------+
1 row in set (0.00 sec)
?
mysql> select inet_ntoa(3232235521);
+-----------------------+
| inet_ntoa(3232235521) |
+-----------------------+
| 192.168.0.1 ? ? ? ? ? |
+-----------------------+
1 row in set (0.00 sec)

package com.mikan;
 
/**
 * @author Mikan
 * @date 2015-09-22 10:59
 */
public class IpLongUtils {
    /**
     * 把字符串IP轉(zhuǎn)換成long
     *
     * @param ipStr 字符串IP
     * @return IP對應的long值
     */
    public static long ip2Long(String ipStr) {
        String[] ip = ipStr.split("\\.");
        return (Long.valueOf(ip[0]) << 24) + (Long.valueOf(ip[1]) << 16)
                + (Long.valueOf(ip[2]) << 8) + Long.valueOf(ip[3]);
    }
 
    /**
     * 把IP的long值轉(zhuǎn)換成字符串
     *
     * @param ipLong IP的long值
     * @return long值對應的字符串
     */
    public static String long2Ip(long ipLong) {
        StringBuilder ip = new StringBuilder();
        ip.append(ipLong >>> 24).append(".");
        ip.append((ipLong >>> 16) & 0xFF).append(".");
        ip.append((ipLong >>> 8) & 0xFF).append(".");
        ip.append(ipLong & 0xFF);
        return ip.toString();
    }
 
    public static void main(String[] args) {
        System.out.println(ip2Long("192.168.0.1"));
        System.out.println(long2Ip(3232235521L));
        System.out.println(ip2Long("10.0.0.1"));
    }
    
}