调用CMD命令

package getmac;
import java.io.*;
public class GetMac {
  public GetMac() {
  }
  public static String getMACAddress(){
    String address="";
    String os=System.getProperty("os.name");
    if(os!=null&&os.startsWith("Windows")){
      try{
        String command="cmd.exe /c ipconfig /all";
        Process p=Runtime.getRuntime().exec(command);
        BufferedReader br=new BufferedReader(new InputStreamReader(p.getInputStream()));
        String line;
        while((line=br.readLine())!=null){
          if(line.indexOf("Physical Address")>0){
            int index=line.indexOf(":");
            index +=2;
            address=line.substring(index);
            break;
          }
        }
        br.close();
        System.out.println(address.trim());
        return address.trim();
      }
      catch(IOException e){
      }
    }
    return address;
  }
  public static void main(String[] args) {
   // GetMac getMac1 = new GetMac();
    getMACAddress();
  }
}