Creating a Single CSV from Multiple CSV's with some adjustments

[facon12]

I am writing an application to check the last modified date on two files for a large number of remote locations. I have a batch file at each location that creates a csv with the following information:

1111 //location ID//
08/03/2011  01:37 PM    <DIR>          Python27 //first file checked//
06/01/2011  12:18 PM                44 ip.txt //second file checked//

Just as a note, this is an example, I'm not actually checking those two file names. The location ID is based on a variable and will be different for each location.

THE PART I NEED TO DO IN JAVA:
I am writing an interface where you select a folder containing lets say 100 of these text files and I first want to make a single CSV out of all of them with the following format:

1111,08/03/2011,06/01/2011

I have found several threads on how to combine CSV files, but it just merges them. I need to read each CSV and take only a piece of the data from the lines and create a new CSV based on the data in them. I think I could potentially use a String Tokenizer to do this but I am not sure. Also as a note I am creating a swing interface for this program so the directory would be selected with a dialogue box and then once selected it would read the directory and create the new CSV. The part of the code where I select the dialogue is below. If this doesn't make sense or more details are needed please let me know and I will respond. I am new to Java and so I may be totally missing something.

public void actionPerformed(ActionEvent evt) {
        Object source = evt.getSource();
        if (source == load) {
            int returnVal = comb.showDialog(BackupCheck.this, "Make CSV");
            comb.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);