Log all network interactions of Java application

Question

I have a monstrous Java app (a client of little-known application server GNUEnterprise) and its source, which I can compile back after making some changes to it. The app use

Answer 1

I just want to post a snippet of code that you can use at starting point. I do not have a"global" logger but with small changes to existing code you can reach your goal. I "log" on standard output, since your problem can be split into two pieces: getting the info from UrlConnection and store it for further reference.

This code logs the request:

public class URLConnectionReader {

  public static void main(String[] args) throws Exception {
  URL oracle = new URL("http://www.google.com/");
  URLConnection yc = oracle.openConnection();

  String headerName = null;
  for (int i = 1; (headerName = yc.getHeaderFieldKey(i)) != null; i++) {
    if (headerName.equals("Set-Cookie")) {
      String cookie = yc.getHeaderField(i);
      System.out.println("Cookie  ::  " + cookie);
    } else {
      System.out.println("Header: "+ yc.getHeaderField(i));
    }
  }

  BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
  String inputLine;
  while ((inputLine = in.readLine()) != null)
    System.out.println(inputLine);
  in.close();
}

}

saving all this data to one or more files is not hard. If you believe that I'm on right way for you problem, I would be glad to edit the answer with other details as needed.