我在我的应用程序中使用了log4j登录记录器,具有基于时间和文件大小的滚动策略(因此文件大小不会超过10MB,并且我们每天都会获得新文件)。我想添加手动滚动到新文件的功能(我们有时会发送日志,并希望新的日志文件在发送后启动)
private static void configureLogbackDirectly(Activity activity, String macAddress) {
if(!logDir.exists()){
if(!logDir.mkdir()){
Log.e("Logger","unable to create logs folder");
}
}
LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();
context.reset();
PatternLayoutEncoder logcatEncoder = new PatternLayoutEncoder();
logcatEncoder.setPattern("[%thread] %-5level %marker: %msg%n");
logcatEncoder.setContext(context);
logcatEncoder.start();
LogcatAppender logcatAppender= new LogcatAppender();
logcatAppender.setCheckLoggable(true);
logcatAppender.setEncoder(logcatEncoder);
logcatAppender.setName(logcatAppenderName);
logcatAppender.start();
RollingFileAppender<ILoggingEvent> rollingFileAppender = new ExtraRollingFileAppender();
rollingFileAppender.setAppend(true);
rollingFileAppender.setContext(context);
rollingFileAppender.setName(rolloverAppenderName);
TimeBasedRollingPolicy<ILoggingEvent> rollingPolicy = new TimeBasedRollingPolicy<>();
SharedPreferences sp = activity.getApplicationContext().getSharedPreferences(activity.getPackageName(), 0);
String deviceId = myApp.GetDeviceID();
rollingPolicy.setFileNamePattern(logDir.getAbsolutePath() +"/" + deviceId + "_" + filePrefix + "_%d{yyyyMMdd}.%i.log");
rollingPolicy.setMaxHistory(21);
rollingPolicy.setParent(rollingFileAppender);
rollingPolicy.setContext(context);
SizeAndTimeBasedFNATP<ILoggingEvent> sizeAndTimeBasedFNATP = new SizeAndTimeBasedFNATP<>();
sizeAndTimeBasedFNATP.setMaxFileSize(FileSize.valueOf("10MB"));
sizeAndTimeBasedFNATP.setContext(context);
sizeAndTimeBasedFNATP.setTimeBasedRollingPolicy(rollingPolicy);
rollingPolicy.setTimeBasedFileNamingAndTriggeringPolicy(sizeAndTimeBasedFNATP);
rollingPolicy.start();
sizeAndTimeBasedFNATP.start();
rollingFileAppender.setRollingPolicy(rollingPolicy);
PatternLayoutEncoder encoder = new PatternLayoutEncoder();
encoder.setPattern("%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %marker: %msg%n");
encoder.setContext(context);
encoder.start();
rollingFileAppender.setEncoder(encoder);
rollingFileAppender.start();
ch.qos.logback.classic.Logger root = (ch.qos.logback.classic.Logger) LoggerFactory.getLogger(LOGGER_NAME);
root.setLevel(Level.INFO);
root.addAppender(logcatAppender);
root.addAppender(rollingFileAppender);
Logger.logger=root;
}
所以我有这个新功能
public static void startNewLogFile() {
ch.qos.logback.classic.Logger root = (ch.qos.logback.classic.Logger)Logger.logger;
RollingFileAppender appender = (RollingFileAppender) root.getAppender(rolloverAppenderName);
if (appender == null) {
return;
}
appender.rollover();
}
但是当我调用新函数时,我收到如下错误:
01-21 07:56:52.824 17816-17816/com.company.Application E/com.Company.APP: [main] ERROR general_logs: uncaughtException:
java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.lastIndexOf(int)' on a null object reference
at ch.qos.logback.core.rolling.helper.FileFilterUtil.afterLastSlash(Unknown Source)
at ch.qos.logback.core.rolling.TimeBasedRollingPolicy.rollover(Unknown Source)
at ch.qos.logback.core.rolling.RollingFileAppender.attemptRollover(Unknown Source)
at ch.qos.logback.core.rolling.RollingFileAppender.rollover(Unknown Source)
at com.company.Application.logging.Logger.startNewLogFile(Logger.java:125)
我可以看到这里有一个问题,但我想知道是否有人为我提供了解决方法
即使使用logback v1.2.3,我也遇到了同样的问题,但是注释有效:
// logback.groovy (part):
file = 'foo.log'
rollingPolicy(SizeAndTimeBasedRollingPolicy) {
maxFileSize = '1MB'
fileNamePattern = "foo.%d{yyyy-MM-dd}.%i.log"
maxHistory = 3
totalSizeCap = '1GB'
}
//component.rollover() // leads to NPE: https://stackoverflow.com/q/54291436/1915920
因此,在启动时滚动更新的解决方法可能是使用应用启动时间戳,如下所示:
// logback.groovy (part):
def ts = new Date().format('yyyy-MM-dd.HH-mm-ss') // workaround to rollover at start: https://stackoverflow.com/q/54291436/1915920
file = "foo.${ts}.log"
rollingPolicy(SizeAndTimeBasedRollingPolicy) {
maxFileSize = '1MB'
fileNamePattern = "foo.${ts}.%d{yyyy-MM-dd}.%i.log"
maxHistory = 3
totalSizeCap = '1GB'
}