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Java with Shell Scripts

I have a file of this format(it is from a packet sniffer-the packets are sent from a host to another):

YY-MM-DD:protocol(tcp,udp,icmp):SRC IP:SRC PORT:DEST IP:DEST PORT

It is a file with 16000 lines and i want to create a GUI,so that i can analyze the data that i have in that file.I want to use Java to create the GUI,but i think that it is better if i use a script instead.Is there a way that i can use a shell script(eg.if i want to see only the tcp connections or if i want to see the traffic that is created from a specific host) and then with the results of that process,using Java to create a nice graffical interface?You can tell that i want the script to do the 'dirty job' and Java the 'nice one'.I am asking if i can do that and how....
I am looking forward to your answers.

Lazaros
Greece

PS.Visit Greece for the Olympic Games :)

Un-tested code:

Code:

try

{

    Runtime rt = Runtime.getRuntime();

    Process proc = rt.exec( "/usr/bin/frobnicate" );

    BufferedReader buf = new BufferedReader(

        InputStreamReader( proc.getInputStream() ) );

    String line;

    while ( ( line = buf.readLine() ) != null )

    {

        System.out.println( "Output from frobnicate: " + line );

    }

}

catch ( IOException e )

{

    System.out.println( "We're boned. " + e.getMessage() );

}