java获取mac地址工具类

java代码在服务器端获取客户端用户的mac地址，服务器端从request中可获取到客户端的ip，再根据ip去获取mac地址。

参考来源：

http://blog.csdn.net/yztezhl/article/details/50058263

代码如下：

public class GetMacAddress{
/**
* 执行命令
* @param in -
* @return
*/

public static String callCmd(String[] cmd) {
String result = "";
String line = "";
try {
Process proc = Runtime.getRuntime().exec(cmd);
InputStreamReader is = new InputStreamReader(proc.getInputStream());
BufferedReader br = new BufferedReader (is);
while ((line = br.readLine ()) != null) {
result += line;
}
}
catch(Exception e) {
e.printStackTrace();
}
return result;
}

/**
*
* @param cmd 第一个命令
* @param another 第二个命令
* @return  第二个命令的执行结果
*/
public static String callCmd(String[] cmd,String[] another) {
String result = "";
String line = "";
try {
Runtime rt = Runtime.getRuntime();
Process proc = rt.exec(cmd);
proc.waitFor(); //已经执行完第一个命令，准备执行第二个命令
proc = rt.exec(another);
InputStreamReader is = new InputStreamReader(proc.getInputStream());
BufferedReader br = new BufferedReader (is);
while ((line = br.readLine ()) != null) {
result += line;
}
}
catch(Exception e) {
e.printStackTrace();
}
return result;
}

/**
*
* @param ip 目标ip,一般在局域网内
* @param sourceString 命令处理的结果字符串
* @param macSeparator mac分隔符号
* @return mac地址，用上面的分隔符号表示
*/
public static String filterMacAddress(final String ip, final String sourceString,final String macSeparator) {
String result = "";
String regExp = "((([0-9,A-F,a-f]{1,2}" + macSeparator + "){1,5})[0-9,A-F,a-f]{1,2})";
Pattern pattern = Pattern.compile(regExp);
Matcher matcher = pattern.matcher(sourceString);
while(matcher.find()){
result = matcher.group(1);
if(sourceString.indexOf(ip) <= sourceString.lastIndexOf(matcher.group(1))) {
break; //如果有多个IP,只匹配本IP对应的Mac.
}
}

return result;
}

/**
*
* @param ip 目标ip
* @return  Mac Address
*
*/
public static String getMacInWindows(final String ip){
String result = "";
String[] cmd = {
"cmd",
"/c",
"ping " + ip
};
String[] another = {
"cmd",
"/c",
"arp -a"
};
try{
String cmdResult = callCmd(cmd,another);
result = filterMacAddress(ip,cmdResult,"-");
return result;
}catch(Exception e){
e.printStackTrace();
return null;
}

}

/**
* @param ip 目标ip
* @return  Mac Address
*
*/
public static String getMacInLinux(final String ip){
String result = "";
String[] cmd = {
"/bin/sh",
"-c",
"ping " + ip + " -c 2 && arp -a"
};
try{
String cmdResult = callCmd(cmd);
result = filterMacAddress(ip,cmdResult,":");
return result;
}catch(Exception e){
e.printStackTrace();
return null;
}

}

/**
* 获取MAC地址
* @return 返回MAC地址
*/
public static String getMacAddress(String ip){
String macAddress = "";
macAddress = getMacInWindows(ip).trim();
if(macAddress==null||"".equals(macAddress)){
macAddress = getMacInLinux(ip).trim();
}
return macAddress;
}

//做个测试
public static void main(String[] args) {
System.out.println(getMacAddress("106.121.6.133"))
}

}

其实，是通过arp命令获取到mac地址。首先如果ip地址可以ping通，系统会缓存ip和mac，然后通过arp命令获取缓存中请求过的ip和mac，进行处理，获取mac地址。