NetworkInterface获取主机ip,判断内外网

private static String getLocalIp() {
        String sip = null;
        InetAddress ip = null;
        boolean bFindIP = false;
        Enumeration<NetworkInterface> netInterfaces = null;
        try {
            netInterfaces = (Enumeration<NetworkInterface>) NetworkInterface.getNetworkInterfaces();
        } catch (SocketException e) {
            e.printStackTrace();
        }
        while (netInterfaces.hasMoreElements()) {
            if (bFindIP) {
                break;
            }
            NetworkInterface ni = (NetworkInterface) netInterfaces.nextElement();
            // ----------特定情况，可以考虑用ni.getName判断
            // 遍历所有ip
            Enumeration<InetAddress> ips = ni.getInetAddresses();
            while (ips.hasMoreElements()) {
                ip = (InetAddress) ips.nextElement();
                if (ip.isSiteLocalAddress() && !ip.isLoopbackAddress() // 127.开头的都是lookback地址
                        && ip.getHostAddress().indexOf(":") == -1) {
                    bFindIP = true;
                    break;
                }
            }
        }
        if (ip != null) {
            sip = ip.getHostAddress();
        }
        return sip;

    }

function getIpNum(ipAddress){
         var ip = new Array();　
         ip= ipAddress.split("."); 
         var a = parseInt(ip[0]);   
         var b = parseInt(ip[1]);   
         var c = parseInt(ip[2]);   
         var d = parseInt(ip[3]);   
    return a * 256 * 256 * 256 + b * 256 * 256 + c * 256 + d;   
}
//是否为内网
function isInnerIP(ip){
     var a1 = getIpNum("10.0.0.0");
     var a2 = getIpNum("10.255.255.255");
     var b1 = getIpNum("172.16.0.0");
     var b2 = getIpNum("172.31.255.255");
     var c1 = getIpNum("192.168.0.0");
     var c2 = getIpNum("192.168.255.255");
     var d1 = getIpNum("10.44.0.0");
     var d2 = getIpNum("10.69.0.255");
     var n = getIpNum(ip);
     return (n >= a1 && n <= a2) || (n >= b1 && n <= b2) || (n >= c1 && n <= c2) || (n >= d1 && n <= d2);
}
/******
 * 截取URL请求参数
 * 
 * @param paras
 * @returns
 */
function getRequestURL(paras) {
    var url = location.href;
    var paraString = url.substring(url.indexOf("?") + 1, url.length).split("&");
    var paraObj = {}
    for (i = 0; j = paraString[i]; i++) {
        paraObj[j.substring(0, j.indexOf("=")).toLowerCase()] = j.substring(j
                .indexOf("=") + 1, j.length);
    }
    var returnValue = paraObj[paras.toLowerCase()];
    if (typeof (returnValue) == "undefined") {
        return "";
    } else {
        return returnValue;
    }
}