How can I display in Java a different color of messages in the console from a logger, depending on the type of message?

Question

Java

I display logs in the program to the console via java.util.logging.Logger.

Output strings are processed by this formatter

package l2p;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.Formatter;
import java.util.logging.LogRecord;

public class ConsoleLogFormatter extends Formatter
{
  private static final String CRLF = "\r\n";
  private static final SimpleDateFormat tsformat = new SimpleDateFormat("HH:mm:ss.SSS  ");
  private Date ts = new Date();

  @Override
  public String format(LogRecord record)
  {
    StringBuffer output = new StringBuffer();
    ts.setTime(record.getMillis());
    output.append(tsformat.format(ts));
    output.append(record.getMessage());
    output.append(CRLF);

    if (record.getThrown() != null)
      try
      {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        record.getThrown().printStackTrace(pw);
        pw.close();
        output.append(sw.toString());
        output.append(CRLF);
      }
      catch (Exception ex)
      {}

    return output.toString();
  }
}

And as a matter of fact, the question is of interest - how can you set the color to the lines depending on the type of message - fine, info, warning, etc.
Moreover, this should work both in the Windows console and in the Linux console.

Maybe someone has come across some ready-made classes on this topic, or at least tell me in which direction to dig.

Answer 1

In Linux, ANSI escape codes are processed natively, imho. But in Windows you need to run a special program. Here for example: github.com/downloads/adoxa/ansicon/ansi153.zip
You need to run “ansicon.exe -p” in the console and then ANSI processing will appear.

Answer 2

I don't know if it will work on Linux, but it works on Windows.
If you want a different color, then change "[31mWarning!". For example, on "[35mWarning!". The text will be purple.
30 - black. 31 - red. 32 - green. 33 - yellow. 34 - blue. 35 - magenta. 36 - blue. 37 - white.

Answer 3

I'll leave here a couple of links to stackoverflow, where various 3rd party libraries are advised that allow this to be implemented.

• How to color system out println output
• Change color of java console output

Answer 4

I did it a little clumsily, but for now, for the first time, it’s fine: I just output the lines to the console in the formatter itself (the code of which was given in the question) via System.out.println with the assignment of special codes for coloring.

Answer 5

I racked my brain for a long time how to do it) I didn’t find a decent solution) I made an output to a file and shoved it there in HTML markup)