java获取客户端ip 及通过ip获取mac地址后台代码（借鉴别人）

1，java获取客户端登录ip地址

protected String getIpAddr(HttpServletRequest request) {
		String ip = request.getHeader("X-Forwarded-For");
		if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("Proxy-Client-IP");
		}
		if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("WL-Proxy-Client-IP");
		}
		if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("HTTP_CLIENT_IP");
		}
		if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("HTTP_X_FORWARDED_FOR");
		}
		if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getRemoteAddr();
		}
		return ip;
	}

2，java通过ip地址获取Mac地址

 /**
		 * 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;
		}

该休息的时候就休息，该工作的时候就集中精力，尽量做到以效率换时间。休息的时候要多看书，开阔自己的视野，考虑问题的时候从整体考虑而不是从自己出发，这样过起来更自在。