새로운 LoggingEvent
을 만드는 것이 왜 까다로운 지 잘 모르겠습니다.
package test.logging;
import org.apache.log4j.DailyRollingFileAppender;
import org.apache.log4j.spi.LoggingEvent;
public class MyDailyRollingFileAppender extends DailyRollingFileAppender {
@Override
protected void subAppend(LoggingEvent event) {
String modifiedMessage = String.format("**** Message modified by MyDailyRollingFileAppender ****\n\n%s\n\n**** Finished modified message ****", event.getMessage());
LoggingEvent modifiedEvent = new LoggingEvent(event.getFQNOfLoggerClass(), event.getLogger(), event.getTimeStamp(), event.getLevel(), modifiedMessage,
event.getThreadName(), event.getThrowableInformation(), event.getNDC(), event.getLocationInformation(),
event.getProperties());
super.subAppend(modifiedEvent);
}
}
이 테스트로 :
package test;
import org.apache.log4j.Logger;
public class TestLogging {
public static void main(String[] args) {
Logger log = Logger.getLogger(TestLogging.class);
log.info("I am testing my logging");
log.info("Here is an exception", new Exception());
}
}
이 구성 :
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
<appender name="MyDailyRollingFileAppender" class="test.logging.MyDailyRollingFileAppender">
<param name="Append" value="true"/>
<param name="datePattern" value="'.'yyyy-MM-dd"/>
<param name="File" value="mine.log"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d %-5p (%x) [%t] %c{1} - %m%n" />
</layout>
</appender>
<root>
<priority value="debug"/>
<appender-ref ref="MyDailyRollingFileAppender"/>
</root>
</log4j:configuration>
나는 다음과 같은 출력을 얻고있다 :
2011-10-14 10:09:09,322 INFO () [main] TestLogging - **** Message modified by MyDailyRollingFileAppender ****
I am testing my logging
**** Finished modified message ****
2011-10-14 10:09:09,333 INFO () [main] TestLogging - **** Message modified by MyDailyRollingFileAppender ****
Here is an exception
**** Finished modified message ****
java.lang.Exception
at test.TestLogging.main(TestLogging.java:10)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
를 이것은 나를 위해 작동하는 것 같다 내가 simila 뭔가를했지만 r에 약간 다른 접근 방식을 사용했습니다. Appender
의 각 유형의 하위 클래스를 작성하는 대신 다른 Appender
오브젝트를 래핑하는 Appender
오브젝트를 작성하고 랩핑 된 Appender
으로 송신하기 전에 메시지를 수정합니다. 이런 식으로 뭔가 :
package test.logging;
import org.apache.log4j.Appender;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.spi.AppenderAttachable;
import org.apache.log4j.spi.LoggingEvent;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
public class MyAppenderWrapper extends AppenderSkeleton implements AppenderAttachable {
private final List<Appender> appenders = new ArrayList<Appender>();
public void close() {
synchronized (appenders) {
for (Appender appender : appenders) {
appender.close();
}
}
}
public boolean requiresLayout() {
return false;
}
public void addAppender(Appender appender) {
synchronized (appenders) {
appenders.add(appender);
}
}
public Enumeration getAllAppenders() {
return Collections.enumeration(appenders);
}
public Appender getAppender(String name) {
synchronized (appenders) {
for (Appender appender : appenders) {
if (appender.getName().equals(name)) {
return appender;
}
}
}
return null;
}
public boolean isAttached(Appender appender) {
synchronized (appenders) {
for (Appender wrapped : appenders) {
if (wrapped.equals(appender)) {
return true;
}
}
return false;
}
}
public void removeAllAppenders() {
synchronized (appenders) {
appenders.clear();
}
}
public void removeAppender(Appender appender) {
synchronized (appenders) {
for (Iterator<Appender> i = appenders.iterator(); i.hasNext();) {
if (i.next().equals(appender)) {
i.remove();
}
}
}
}
public void removeAppender(String name) {
synchronized (appenders) {
for (Iterator<Appender> i = appenders.iterator(); i.hasNext();) {
if (i.next().getName().equals(name)) {
i.remove();
}
}
}
}
@Override
protected void append(LoggingEvent event) {
String modifiedMessage = String.format("**** Message modified by MyAppenderWrapper ****\n\n%s\n\n**** Finished modified message ****", event.getMessage());
LoggingEvent modifiedEvent = new LoggingEvent(event.getFQNOfLoggerClass(), event.getLogger(), event.getTimeStamp(), event.getLevel(), modifiedMessage,
event.getThreadName(), event.getThrowableInformation(), event.getNDC(), event.getLocationInformation(),
event.getProperties());
synchronized (appenders) {
for (Appender appender : appenders) {
appender.doAppend(modifiedEvent);
}
}
}
}
당신처럼 구성 할 수 있습니다 :
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
<appender name="StdOut" class="org.apache.log4j.ConsoleAppender">
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d %-5p (%x) [%t] %c{1} - %m%n" />
</layout>
</appender>
<appender name="FileAppender" class="org.apache.log4j.DailyRollingFileAppender">
<param name="Append" value="true"/>
<param name="datePattern" value="'.'yyyy-MM-dd"/>
<param name="File" value="mine.log"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d %-5p (%x) [%t] %c{1} - %m%n" />
</layout>
</appender>
<appender name="AppenderWrapper" class="test.logging.MyAppenderWrapper">
<appender-ref ref="StdOut"/>
<appender-ref ref="FileAppender"/>
</appender>
<root>
<priority value="debug"/>
<appender-ref ref="AppenderWrapper"/>
</root>
</log4j:configuration>
메시지가 여전히 원래 펜더에 있지만 수정 된 메시지와 함께 전송됩니다 그런 식으로.
버전 1.2.15 이상을 사용하고 있기 때문에 효과가 있습니다. 이전 log4j 버전에는 예제에서 사용하는 메소드가 없으므로 작성자의 문제입니다. 오랫동안 최신 버전이었던 많은 프로젝트는 1.2.14 버전을 사용합니다. – MaDa
1.2.16으로 업그레이드하여 예제를 사용하여 새 LoggingEvent를 만들 수있었습니다. 도와 주셔서 감사합니다! – user993719