java取客户端mac地址为什么报java.io.IOException: CreateProcess error=2

[橙子8145]

代码是这样的

public static String getIP() {

		try {
			FacesContext fc = FacesContext.getCurrentInstance();
			HttpServletRequest request = (HttpServletRequest) fc
					.getExternalContext().getRequest();
			return request.getRemoteAddr();
		} catch (Exception e) {

			e.printStackTrace();
		}
		return "";
	}

这里取ip地址

public static String getMac(String ip) {
		String str = "";
		String macAddress = "";
		Process p;
		try {
			p = Runtime.getRuntime().exec("nbtstat -A " + ip);
			InputStreamReader ir = new InputStreamReader(p.getInputStream());
			LineNumberReader input = new LineNumberReader(ir);
			for (int i = 1; i < 100; i++) {
				str = input.readLine();
				if (str != null) {
					if (str.indexOf("MAC Address") > 1) {
						macAddress = str.substring(
								str.indexOf("MAC Address") + 14, str.length());
						break;
					}
				}
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return macAddress;

取mac

public static void main(String[] args) {
	
		System.out.println(	getMac( getIP()));
	}

运行出来

报异常....求高人指导 谢谢


java.lang.NullPointerException
at com.getMAc.getIP(getMAc.java:17)
at com.getMAc.main(getMAc.java:54)
java.io.IOException: Cannot run program "nbtstat": CreateProcess error=2, ?????????
at java.lang.ProcessBuilder.start(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at com.getMAc.getMac(getMAc.java:31)
at com.getMAc.main(getMAc.java:54)
Caused by: java.io.IOException: CreateProcess error=2, ?????????
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(Unknown Source)
at java.lang.ProcessImpl.start(Unknown Source)
... 6 more

[花谢尊前不敢香]

先打印下看看你ip输出的是什么，感觉应该是ip不是合法的ip造成的。

[橙子8145]

打印出来就是我本机的ip啊 ip不合法？怎么回事？