gethostname.java

3种用Java写的算法 其中包括了DES凯撒 编译软件用的是Intell J IDEA

import java.net.Socket;
import java.net.InetAddress;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.BufferedReader;

/**
 * Created by IntelliJ IDEA.
 * User: ${040421220 郑天南}
 * Date: 2007-4-12
 * Time: 20:27:41
 */
public class getHostName
{
    public static void main(String[] args)
    {
        try
        {
          Socket s=new Socket("127.0.0.1",6629);
          InetAddress address=s.getLocalAddress();
          //getHostName
          System.out.println(address.getHostName());
          //getMACaddress
          MACAddress mac=new MACAddress();
          System.out.println(mac.getMACAddress());
        }
        catch(Exception ex)
        {

        }

    }
}

 class MACAddress {
    public MACAddress() {
    }

    public  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();
                return address.trim();
            } catch (IOException e) {}
        }
        return address;
    }

}