S'il n'y a pas d'appender existant répondant à vos besoins, créez un plug-in Appender personnalisé.
Je réunis un exemple rapide.
package com.logging;
import org.apache.logging.log4j.core.Filter;
import org.apache.logging.log4j.core.Layout;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.appender.AbstractAppender;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
import org.apache.logging.log4j.core.config.plugins.PluginElement;
import org.apache.logging.log4j.core.config.plugins.PluginFactory;
import org.apache.logging.log4j.core.layout.PatternLayout;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Serializable;
import java.io.Writer;
@Plugin(name = "WriterAppender", category = "Core", elementType = "appender", printObject = false)
public class WriterAppender extends AbstractAppender{
private Writer writer;
protected WriterAppender(String name, Filter filter, Layout<? extends Serializable> layout, boolean ignoreExceptions, String argOne, String argTwo) {
super(name, filter, layout, ignoreExceptions);
writer = new PrintWriter(System.out);//init or retrieve writer resource upon construction
}
@Override
public void append(LogEvent logEvent) {
try {
writer.write(logEvent.getMessage().getFormattedMessage());
} catch (IOException e) {
e.printStackTrace();
}
}
@PluginFactory
public static WriterAppender createAppender(
@PluginAttribute("name") String name,
@PluginElement("Layout") Layout<? extends Serializable> layout,
@PluginElement("Filter") final Filter filter,
@PluginAttribute("otherAttribute") String otherAttributeOne,
@PluginAttribute("otherAttributeTwo") String otherAttributeTwo
) {
if (name == null) {
LOGGER.error("No name provided for MyCustomAppenderImpl");
return null;
}
if (layout == null) {
layout = PatternLayout.createDefaultLayout();
}
return new WriterAppender(name, filter, layout, true, otherAttributeOne,otherAttributeTwo);
}
}
Vous utiliseriez la configuration pour ajouter WriterAppender comme vous le feriez pour n'importe quel autre appender.