java通过IP地址获取mac地址

package org.util.demo;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* 通过arp命令获取MAC地址：
*
*通过IP获取MAC地址也可以用nbtstat命令，但是nbtstat获取不到ipad的mac地址，所以现在改用arp命令获取mac地址
*但通过arp命令获取地址只能是与服务器有过通信的才能查看，所以在代码中有一次ping一次对方IP的方法，
*	1、确保IP通信正常；
*	2、建立与对面IPAD的通信
*详细见代码，如有更好的建议忘各位指正；
*
* @author 我叫王大鑫 lxdyy@outlook.com
*
*/
public class Testjar {

//	public static final String IP = "172.17.36.45";

public static void main(String[] args) throws IOException {
BufferedReader strin=new BufferedReader(new InputStreamReader(System.in));
System.out.println("输入IP:");
String IP = strin.readLine();
System.out.println(GetMacAddress(IP));
}

/**
* 判断IP是否非法
* 判断IP是否为本地IP 例如：127.0.0.1
* 判断IP是否可正常通信
* 获取MAC地址
* @param ip
* @return
*/
private static String GetMacAddress(String ip) {
if(!booleanIP(ip)){
return "IP非法";
}
if(ip.equalsIgnoreCase("127.0.0.1")){
return "不能输入本地地址";
}
System.out.println("输入的IP地址为"+ip);
String str = "";
String macAddress = "";
try {
if (!Ping(ip)) {
return "无法访问";
}
System.out.println("IP可以正常访问");
Process p = Runtime.getRuntime().exec("arp -a ");
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(ip) > 1) {
macAddress = str.substring(str.indexOf(ip) + 22,str.length() - 11);
break;
}
}
}
} catch (IOException e) {
e.printStackTrace(System.out);
}
return macAddress;
}

/**
* 验证IP是否非法
* @param ip
* @return
*/
private static boolean booleanIP(String ip) {
String p = "(2[5][0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})\\.(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})\\.(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})\\.(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})";
Pattern pattern = Pattern.compile(p);
Matcher matcher = pattern.matcher(ip);
return matcher.matches();
}

/**
* 判断ip通信是否通畅
* @param ip
* @return
* @throws IOException
*/
private static boolean Ping(String ip) throws IOException {
System.out.println("进行IP在线监测");
boolean f = false;
Process process = Runtime.getRuntime().exec("ping " + ip);
InputStreamReader r = new InputStreamReader(process.getInputStream());
LineNumberReader returnData = new LineNumberReader(r);
String line = "";
while ((line = returnData.readLine()) != null) {
if(line.indexOf(String.valueOf("TTL")) == -1){
}else {
f = true;
break;
}
}
return f;
}

}