read from file and write some parts in another file

I have to read from a text file and format the input. I'm new to java reading from files, and I don't know how to work with just some parts of what I read Here is the initial file: http://pastebin.com/D0paWtAd

And I have to write in another file the following output: Average,Joe,44,31,18,12,9,10

I've managed just to take everything from the file and print it to output. I would need help just in taking the output I need and print it to the screen. Any help is appreciated.

This is what I wrote up to now:

public class FileParsing {
public static String

read(String filename) throws IOException {
BufferedReader in = new BufferedReader(new FileReader("C:\\Users\\Bogdi\\Desktop\\example.txt"));

String s;
StringBuilder sb = new StringBuilder();
while((s = in.readLine())!= null)   sb.append(s + "\n");

in.close();

return sb.toString();
}

If your goal is to do the specified output in another file you don't need to first get the content of your file in a StringBuilder before processing it, you can append the processed datas directly in a StringBuilder then you can write the result in a file. Here is an example that would work for the given file but you may have to modify it if the keys change in the future:

The following method will correctly process the datas from your file

public static String read(String filename) throws IOException {
    BufferedReader in = new BufferedReader(new FileReader(filename));

    String s;
    StringBuilder sb = new StringBuilder();
    while((s = in.readLine())!= null) {
        String[] split1 = s.split("=");

        if (split1[0].equals("name")) {

            StringTokenizer tokenizer = new StringTokenizer(split1[1]);
            sb.append(tokenizer.nextToken());
            sb.append(",");

            sb.append(tokenizer.nextToken());
            sb.append(",");


        } else if (split1[0].equals("index")) {

            sb.append(split1[1] + ",");

        } else if (split1[0].equals("FBid")) {
            sb.append(split1[1]);

        } else {

            StringTokenizer tokenizer = new StringTokenizer(split1[1]);
            String wasted = tokenizer.nextToken();

            sb.append(tokenizer.nextToken() + ",");

        }

    }

    in.close();

    return sb.toString();
}

The next method will read any string to a file

public static void writeStringToFile(String string, String  filePath) throws IOException {

    BufferedWriter writer = new BufferedWriter(
            new FileWriter(
                    new File(filePath)
                    )
            );

    writer.write(string);

    writer.newLine();
    writer.flush();
    writer.close();

}

And here is a simple tests (File1.txt contains the datas from the file you shared on paste bin and I write them in another file)

public static void main(String[] args) throws Exception {

    String datas = read("C:\\Tests\\File1.txt");
    System.out.println(datas);

    writeStringToFile(datas, "C:\\Tests\\FileOuput.txt" );


}

It will produce the exact output that you are expecting

[EDIT] @idk, apparently you have an exception executing my example, while it is working fine for me. That could only mean there is an error at data level. Here is the data sample that I used (and I believe I exactly copy the datas you shared)

And here is the result: