how to get a console output (e.g. on eclipse) AND write/copy the same output to file?

Question

I know that this type of question have been asked many times. But I didn't find any answer for myself. That's why i am asking once more.

I have got an output on my console. I want to copy the same output 1-to-1 to a file. I don't want to redirect. I want some kind of "copy" it and "write" into a file. I hope the question is clear enough, cause I have seen that the other times, the question wasn't clear.

Anyways, I have tried it with the "System.setOut" methode. But it just redirect everything to the file. I cannot write all the "System.out.println"s with a write() into a file, that to much.

Thanks for helping.

Don't use a system out , rather just write to a file .. stackoverflow.com/questions/15758685/… — Kenneth Clark
– Kenneth Clark, Commented May 5, 2014 at 17:54
This may serve your needs stackoverflow.com/questions/16237546/… — Kenneth Clark
– Kenneth Clark, Commented May 5, 2014 at 17:59
Thanx! @Kenneth: I had alread found that. But the problem here was, it just went through my while and for loops and wrote and in the file the last output. I guess it overwrote just the others — user3578544
– user3578544, Commented May 5, 2014 at 18:36

rush2sk8 · Accepted Answer · 2014-05-05 20:34:49Z

0

There is no way you can get console output. You have to do everything before printing

To Write our to a file do this.

try{

FileWriter x = new FileWriter(new File("x.txt"));
x.write("hello");

}catch(IOExecption e){

}

That will write out hello to a file

edited May 5, 2014 at 20:34

answered May 5, 2014 at 18:25

rush2sk8

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2 Comments

user3578544 Over a year ago

but how can I do it? i got this one: FileOutputStream myFile = new FileOutputStream(task.getResultFile()); PrintStream output = new PrintStream(in); then everytime i called System.out.println(), I also called output.println(). But the problem was as i said to Kenneth, that it overwrite all the other lines and print in the file, only the last phrase, since i am using while and for loops.

Kenneth Clark Over a year ago

You will need to call the flush() method on the FileWriter which writes the content of the buffer to the destination file.

Kenneth Clark · Accepted Answer · 2014-05-06 04:36:25Z

You could do something like this , the system out will happen after the log to file. This code will append. Please This is NOT a good example of Exception handling, just an example of what you can do.

  protected void writeToFileAndLog(String logEntry)
  {
    String file = "MyAmazingLog.txt";
    try
    {

      FileOutputStream appendedFile = new FileOutputStream(file, true);
      DataOutputStream out = new DataOutputStream(appendedFile);

      out.writeBytes(String.format("%s\n", logEntry));
      out.flush();
      out.close();
      System.out.println(logEntry);
    }
    catch (FileNotFoundException e)
    {
      e.printStackTrace();
    }
    catch (IOException e)
    {
      e.printStackTrace();
    }
  }

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