您的自定义重写策略应编码为log4j2插件。这使您可以在RewriteAppender中配置自定义RewritePolicy。
@Plugin(name = "InjectMarkerPolicy", category = "Core", elementType = "rewritePolicy", printObject = true)public final class MarkerInjectorRewritePolicy implements RewritePolicy { @Override public LogEvent rewrite(final LogEvent event) { final Marker marker = event.getMarker(); if (marker == null) return event; // If there's a Marker, add it to the ThreadContextMap // so the RoutingAppender can properly routes log messages // event's context map is immutable, so need to make a copy... Map<String, String> mdc = new HashMap<>(event.getContextMap()); mdc.put("_marker", marker.getName()); LogEvent result = new Log4jLogEvent(event.getLoggerName(), event.getMarker(), event.getLoggerFqcn(), event.getLevel(), event.getMessage(), event.getThrown(), mdc, event.getContextStack(), event.getThreadName(), event.getSource(), event.getTimeMillis()); return result; }}配置示例（TODO：为包属性设置正确的值）：
<Configuration status="trace" packages="my.rewritepolicy.plugin.package"> <Appenders> <Console name="STDOUT"> <PatternLayout pattern="[%-5level] %c{1.} %m%n"/> </Console> <Rewrite name="Rewrite"> <InjectMarkerPolicy /> <AppenderRef ref="STDOUT"/> </Rewrite> </Appenders> <Loggers> <Root level="trace"> <AppenderRef ref="Rewrite"/> </Root> </Loggers></Configuration>
