Redirect System.out and System.err to an slf4j Logger

LoggingOutputStream.java

import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.io.PrintStream;

import org.slf4j.Logger;

public class LoggingOutputStream extends OutputStream {
    
	public static void redirectSysOutAndSysErr(Logger logger) {
		System.setOut(new PrintStream(new LoggingOutputStream(logger, LogLevel.INFO)));
		System.setErr(new PrintStream(new LoggingOutputStream(logger, LogLevel.ERROR)));
	}

	private final ByteArrayOutputStream baos = new ByteArrayOutputStream(1000);
	private final Logger logger;
	private final LogLevel level;

	public enum LogLevel {
		TRACE, DEBUG, INFO, WARN, ERROR,
	}

	public LoggingOutputStream(Logger logger, LogLevel level) {
		this.logger = logger;
		this.level = level;
	}

	@Override
	public void write(int b) {
		if (b == '\n') {
			String line = baos.toString();
			baos.reset();

			switch (level) {
			case TRACE:
				logger.trace(line);
				break;
			case DEBUG:
				logger.debug(line);
				break;
			case ERROR:
				logger.error(line);
				break;
			case INFO:
				logger.info(line);
				break;
			case WARN:
				logger.warn(line);
				break;
			}
		} else {
			baos.write(b);
		}
	}

}