/** * 通过HttpServletRequest返回IP地址 * @param request HttpServletRequest * @return ip String * @throws Exception */public String getIpAddr(HttpServletRequest request) throws Exception {    String ip = request.getHeader("x-forwarded-for");    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {        ip = request.getHeader("Proxy-Client-IP");    }    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {        ip = request.getHeader("WL-Proxy-Client-IP");    }    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {        ip = request.getHeader("HTTP_CLIENT_IP");    }    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {        ip = request.getHeader("HTTP_X_FORWARDED_FOR");    }    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {        ip = request.getRemoteAddr();    }    return ip;} /** * 通过IP地址获取MAC地址 * @param ip String,127.0.0.1格式 * @return mac String * @throws Exception */public String getMACAddress(String ip) throws Exception {    String line = "";    String macAddress = "";    final String MAC_ADDRESS_PREFIX = "MAC Address = ";    final String LOOPBACK_ADDRESS = "127.0.0.1";    //如果为127.0.0.1,则获取本地MAC地址。    if (LOOPBACK_ADDRESS.equals(ip)) {        InetAddress inetAddress = InetAddress.getLocalHost();        //貌似此方法需要JDK1.6。        byte[] mac = NetworkInterface.getByInetAddress(inetAddress).getHardwareAddress();        //下面代码是把mac地址拼装成String        StringBuilder sb = new StringBuilder();        for (int i = 0; i < mac.length; i++) {            if (i != 0) {                sb.append("-");            }            //mac[i] & 0xFF 是为了把byte转化为正整数            String s = Integer.toHexString(mac[i] & 0xFF);            sb.append(s.length() == 1 ? 0 + s : s);        }        //把字符串所有小写字母改为大写成为正规的mac地址并返回        macAddress = sb.toString().trim().toUpperCase();        return macAddress;    }    //获取非本地IP的MAC地址    try {        Process p = Runtime.getRuntime().exec("nbtstat -A " + ip);        InputStreamReader isr = new InputStreamReader(p.getInputStream());        BufferedReader br = new BufferedReader(isr);        while ((line = br.readLine()) != null) {            if (line != null) {                int index = line.indexOf(MAC_ADDRESS_PREFIX);                if (index != -1) {                    macAddress = line.substring(index + MAC_ADDRESS_PREFIX.length()).trim().toUpperCase();                }            }        }        br.close();    } catch (IOException e) {        e.printStackTrace(System.out);    }    return macAddress;}

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