Question

How to redirect Glassfish server output into HttpServletResponse.out? I am making servlet in NetBeans.

Answer 1

So.. to print only lines which appeared after invoking script I’ve made such code:

BufferedReader reader = new BufferedReader(new FileReader("/path/to/server/log/server.log"));
int lines = 0;
while (reader.readLine() != null) {
    lines++;
}

reader.close();

BufferedReader reader2 = new BufferedReader(new FileReader("/path/to/server/log/server.log"));
String strLine;
int i = 0;
while (i != lines) {
   reader2.readLine();
   i++;

}
while ((strLine = reader2.readLine()) != null) {
    out.println(stringToHTMLString(strLine));
    out.println("<br>");
}

reader2.close();

When servlet starts it counts lines in server log (saves it in variable i), then after clicking on action form it read lines which indexes are higher than i and displays it on html page. I’ve used function stringToHTMLString which I found somewhere on stackoverflow.

Greets.