Java Blog für Programmierer

Snippet: NETSTAT in Java with command line call

25.08.2012 · Christian Ullenboom

import java.io.IOException;
import java.util.*;
import java.util.regex.Pattern;

public class Netstat
{
  public static class Protocoll
  {
    public String protocoll;
    public String localAddress;
    public String remoteAddress;
    public String status;

    public Protocoll( String protocoll, String localAddress, String remoteAddress, String status )
    {
      this.protocoll = protocoll;
      this.localAddress = localAddress;
      this.remoteAddress = remoteAddress;
      this.status = status;
    }

    @Override
    public String toString()
    {
      return String.format( "%-6s %-22s %-22s %s", protocoll, localAddress, remoteAddress, status );
    }
  }

  public static void main( String[] args ) throws IOException
  {
    for ( Protocoll p : netStat() )
      System.out.println( p );
  }

  public static Iterable netStat() throws IOException
  {
    Collection result = new ArrayList();
    ProcessBuilder builder = new ProcessBuilder( "netstat", "-n" );
    Process p = builder.start();
    try ( Scanner scanner = new Scanner( p.getInputStream() ) ) {
      Pattern pattern = Pattern.compile( "(TCP|UDP)\\s+(\\S+)\\s+(\\S+)\\s+(\\S+)" );
      while ( scanner.findWithinHorizon( pattern, 0 ) != null )
        result.add( new Protocoll( scanner.match().group( 1 ), scanner.match().group( 2 ), scanner.match().group( 3 ), scanner.match().group( 4 ) ) );
    }
    return result;
  }
}

This leads to something like

TCP 127.0.0.1:16709 127.0.0.1:49159 HERGESTELLT

TCP 127.0.0.1:19872 127.0.0.1:49176 HERGESTELLT

TCP 127.0.0.1:49159 127.0.0.1:16709 HERGESTELLT

TCP 127.0.0.1:49176 127.0.0.1:19872 HERGESTELLT

TCP 127.0.0.1:49189 127.0.0.1:49190 HERGESTELLT

TCP 127.0.0.1:49190 127.0.0.1:49189 HERGESTELLT

Kategorien: Snippet