转载 ip-long

ip->long , long->ip的转换方法
/** 
     * ip地址转成整数. 
     * @param ip 
     * @return 
     */ 
    public static long ip2long(String ip) {  
        String[] ips = ip.split("[.]");  
        long num =  16777216L*Long.parseLong(ips[0]) + 65536L*Long.parseLong(ips[1]) + 256*Long.parseLong(ips[2]) + Long.parseLong(ips[3]);  
        return num;  
    }  
      
    /** 
     * 整数转成ip地址. 
     * @param ipLong 
     * @return 
     */ 
    public static String long2ip(long ipLong) {  
        //long ipLong = 1037591503;  
        long mask[] = {0x000000FF,0x0000FF00,0x00FF0000,0xFF000000};  
        long num = 0;  
        StringBuffer ipInfo = new StringBuffer();  
        for(int i=0;i<4;i++){  
            num = (ipLong & mask[i])>>(i*8);  
            if(i>0) ipInfo.insert(0,".");  
            ipInfo.insert(0,Long.toString(num,10));  
        }  
        return ipInfo.toString();  
    }