IP地址转换

数值->点分字符串

private static String longToIP(long longIP)
{
    StringBuffer sb=new StringBuffer("");
    sb.append(String.valueOf(longIP&0x000000FF));
    sb.append(".");
    sb.append(String.valueOf((longIP&0x0000FFFF)>>>8));
    sb.append(".");
    sb.append(String.valueOf((longIP&0x00FFFFFF)>>>16)); 
    sb.append(".");
    sb.append(String.valueOf(longIP>>>24));//直u25509 右u31227 24位
    return sb.toString(); 
} 

点分字符串->数值

private static long ipToLong(String strIP)
{
    long [] ip=new long[4];
    int position1=strIP.indexOf(".");
    int position2=strIP.indexOf(".",position1+1);
    int position3=strIP.indexOf(".",position2+1);  
    ip[0]=Long.parseLong(strIP.substring(0,position1));
    ip[1]=Long.parseLong(strIP.substring(position1+1,position2));
    ip[2]=Long.parseLong(strIP.substring(position2+1,position3));
    ip[3]=Long.parseLong(strIP.substring(position3+1));
    return (ip[3]<<24)+(ip[2]<<16)+(ip[1]<<8)+ip[0]; 
}

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