How can we redirect a Java program console output to multiple files

Question

How can we redirect the eclipse console output to a file  I can    Run Configuration- Commons- Select a file  Use System setOut PrintStream  and System setErr PrintStream     The problem with 1  is that I need to record console output to different files instead of one file    The problem with 2  is that it only stores console output generated by System out println   or stacktrace of an exception thrown  It does not capture other kind of outputs e g  log4j warnings etc    How can we redirect console output to different files programmatically

User · Answer

We can do this by setting out variable of System class in the following way

System.setOut(new PrintStream(new FileOutputStream("Path to output file"))). Also You need to close or flush 'out'(System.out.close() or System.out.flush()) variable so that you don't end up missing some output.

Source : http://xmodulo.com/how-to-save-console-output-to-file-in-eclipse.html

User · Answer

Go to run as and choose Run Configurations -  Common and in the Standard Input and Output you can choose a File also

User · Answer

To solve the problem I use   string prompt  variable  It shows a input dialog when application runs  I can set the date time manually at that dialog    Move cursor at the end of file path   Click variables and select string prompt  Select Apply and Run

User · Answer

You could use a  variable  inside the output filename  for example    tmp FetchBlock-  current date  txt   current date      Returns the current system time formatted as yyyyMMdd HHmm  An optional argument can be used to provide alternative formatting   The argument must be valid pattern for java util SimpleDateFormat    Or you can also use a system property or an env var to specify something dynamic  either one needs to be specified as arguments

User · Answer

You can set the output of System out programmatically by doing   System setOut new PrintStream new BufferedOutputStream new FileOutputStream   location to console out     true      Edit   Due to the fact that this solution is based on a PrintStream  we can enable autoFlush  but according to the docs      autoFlush - A boolean  if true  the output buffer will be flushed   whenever a byte array is written  one of the println methods is   invoked  or a newline character or byte    n   is written   So if a new line isn t written  remember to System out flush   manually    Thanks Robert Tupelo-Schneck

[java] How can we redirect a Java program console output to multiple files?

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