Basta ya de investigar por internet ya que has llegado al lugar exacto, tenemos la solución que necesitas recibir pero sin problemas.
Solución:
Mi sugerencia es, ¿por qué no escribe su OutputStream entonces? Estaba a punto de escribir uno para ti, pero encontré este buen ejemplo en la red, ¡compruébalo!
LogOutputStream.java
/*
* Jacareto Copyright (c) 2002-2005
* Applied Computer Science Research Group, Darmstadt University of
* Technology, Institute of Mathematics & Computer Science,
* Ludwigsburg University of Education, and Computer Based
* Learning Research Group, Aachen University. All rights reserved.
*
* Jacareto is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* Jacareto is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with Jacareto; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
package jacareto.toolkit.log4j;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import java.io.OutputStream;
/**
* This class logs all bytes written to it as output stream with a specified logging level.
*
* @author [email protected]">Christian Spannagel
* @version 1.0
*/
public class LogOutputStream extends OutputStream
/** The logger where to log the written bytes. */
private Logger logger;
/** The level. */
private Level level;
/** The internal memory for the written bytes. */
private String mem;
/**
* Creates a new log output stream which logs bytes to the specified logger with the specified
* level.
*
* @param logger the logger where to log the written bytes
* @param level the level
*/
public LogOutputStream (Logger logger, Level level)
setLogger (logger);
setLevel (level);
mem = "";
/**
* Sets the logger where to log the bytes.
*
* @param logger the logger
*/
public void setLogger (Logger logger)
this.logger = logger;
/**
* Returns the logger.
*
* @return DOCUMENT ME!
*/
public Logger getLogger ()
return logger;
/**
* Sets the logging level.
*
* @param level DOCUMENT ME!
*/
public void setLevel (Level level)
this.level = level;
/**
* Returns the logging level.
*
* @return DOCUMENT ME!
*/
public Level getLevel ()
return level;
/**
* Writes a byte to the output stream. This method flushes automatically at the end of a line.
*
* @param b DOCUMENT ME!
*/
public void write (int b)
byte[] bytes = new byte[1];
bytes[0] = (byte) (b & 0xff);
mem = mem + new String(bytes);
if (mem.endsWith ("n"))
mem = mem.substring (0, mem.length () - 1);
flush ();
/**
* Flushes the output stream.
*/
public void flush ()
logger.log (level, mem);
mem = "";
Puede utilizar Log4j IOStreams
El componente IOStreams es una extensión API de Log4j que proporciona numerosas clases de java.io que pueden escribir en un registrador mientras escriben en otro OutputStream o Writer, o el contenido leído por un InputStream o un lector puede ser intervenido por un registrador.
Puede crear un OutputStream de esta manera:
OutputStream outputStream = IoBuilder
.forLogger(logger)
.buildOutputStream();
A continuación se muestra un ejemplo con Appium, iniciándolo programáticamente y controlando su registro con log4j.
final Logger logger = LogManager.getLogger(getClass());
cap = new DesiredCapabilities();
cap.setCapability("noReset", "false");
//Build the Appium service
builder = new AppiumServiceBuilder();
builder.withIPAddress("127.0.0.1");
builder.usingPort(4723);
builder.withCapabilities(cap);
builder.withArgument(GeneralServerFlag.SESSION_OVERRIDE);
builder.withArgument(GeneralServerFlag.LOG_LEVEL,"debug");
//Start the server with the builder
service = AppiumDriverLocalService.buildService(builder);
OutputStream outputStream = IoBuilder
.forLogger(logger)
.buildOutputStream();
service.addOutPutStream(outputStream);
service.start();
¡¡¡Espero que esto ayude!!!
Fuente: http://sysgears.com/articles/how-to-redirect-stdout-and-stderr-writing-to-a-log4j-appender/
Blockquote
Log4j no permite capturar mensajes stdout y stderr de forma inmediata. Sin embargo, si está utilizando componentes de terceros y tiene que registrar mensajes que se descargan en las transmisiones, puede hacer un pequeño truco e implementar una transmisión de salida personalizada que admita el registro.
Esto ya lo ha hecho Jim Moore (consulte LoggingOutputStream en el código fuente de log4j). El único problema es que LoggingOutputStream de JimMoore requiere org.apache.log4j.Category y org.apache.log4j.Priority, que ahora están parcialmente en desuso.
Aquí está LoggingOutputStream modificado que evita métodos obsoletos:
public class LoggingOutputStream extends OutputStream
/**
* Default number of bytes in the buffer.
*/
private static final int DEFAULT_BUFFER_LENGTH = 2048;
/**
* Indicates stream state.
*/
private boolean hasBeenClosed = false;
/**
* Internal buffer where data is stored.
*/
private byte[] buf;
/**
* The number of valid bytes in the buffer.
*/
private int count;
/**
* Remembers the size of the buffer.
*/
private int curBufLength;
/**
* The logger to write to.
*/
private Logger log;
/**
* The log level.
*/
private Level level;
/**
* Creates the Logging instance to flush to the given logger.
*
* @param log the Logger to write to
* @param level the log level
* @throws IllegalArgumentException in case if one of arguments
* is null.
*/
public LoggingOutputStream(final Logger log,
final Level level)
throws IllegalArgumentException level == null)
throw new IllegalArgumentException(
"Logger or log level must be not null");
this.log = log;
this.level = level;
curBufLength = DEFAULT_BUFFER_LENGTH;
buf = new byte[curBufLength];
count = 0;
/**
* Writes the specified byte to this output stream.
*
* @param b the byte to write
* @throws IOException if an I/O error occurs.
*/
public void write(final int b) throws IOException
if (hasBeenClosed)
throw new IOException("The stream has been closed.");
// don't log nulls
if (b == 0)
return;
// would this be writing past the buffer?
if (count == curBufLength)
// grow the buffer
final int newBufLength = curBufLength +
DEFAULT_BUFFER_LENGTH;
final byte[] newBuf = new byte[newBufLength];
System.arraycopy(buf, 0, newBuf, 0, curBufLength);
buf = newBuf;
curBufLength = newBufLength;
buf[count] = (byte) b;
count++;
/**
* Flushes this output stream and forces any buffered output
* bytes to be written out.
*/
public void flush()
if (count == 0)
return;
final byte[] bytes = new byte[count];
System.arraycopy(buf, 0, bytes, 0, count);
String str = new String(bytes);
log.log(level, str);
count = 0;
/**
* Closes this output stream and releases any system resources
* associated with this stream.
*/
public void close()
flush();
hasBeenClosed = true;
Ahora puede capturar los mensajes que se vacían en stderr o stdout de la siguiente manera:
System.setErr(new PrintStream(new LoggingOutputStream(
Logger.getLogger("outLog"), Level.ERROR)));
La configuración de log4j.properties:
log4j.logger.outLog=error, out_log
log4j.appender.out_log=org.apache.log4j.RollingFileAppender
log4j.appender.out_log.file=/logs/error.log
log4j.appender.out_log.MaxFileSize=10MB
log4j.appender.out_log.threshold=error
Dmitriy Pavlenko, SysGears
Blockquote
valoraciones y reseñas
Recuerda que te concedemos decir si diste con la solución.