属性文件中的 java util logging 配置过滤器

Question

我有一个 maven 项目，我在其中编写了一个 java.util.logging 过滤器，如下所示。

package com.xyz.filters;

import java.util.logging.Filter;
import java.util.logging.LogRecord;

class CustomFilter implements Filter {

 public boolean isLoggable(LogRecord record) {
    return record.getLoggerName().indexOf("com.package.name") != -1;
 }
}

我有一个属性文件，我在其中配置了控制台和文件处理程序，除了删除文件中不需要的日志外，还需要添加一个过滤器。 我添加了过滤器如下：

java.util.logging.FileHandler.filter = com.xyz.filters.CustomFilter

但未应用过滤器。我在这里做错了什么。

更新：添加配置文件

    ############################################################
#   Default Logging Configuration File
#
# You can use a different file by specifying a filename
# with the java.util.logging.config.file system property.  
# For example java -Djava.util.logging.config.file=myfile
############################################################

############################################################
#   Global properties
#   NOTE: this configuration file use to get the handler list,
#   Properties(except level property) define for each handler
#   may be not available because LogRecords handover to log4j
#   appenders in runtime.
############################################################

# "handlers" specifies a comma separated list of log Handler 
# classes.  These handlers will be installed during VM startup.
# Note that these classes must be on the system classpath.
# By default we only configure a ConsoleHandler, which will only
# show messages at the INFO and above levels.
#handlers= java.util.logging.ConsoleHandler

# To also add the FileHandler, use the following line instead.
#handlers= java.util.logging.FileHandler
# Add org.wso2.carbon.bootstrap.logging.handlers.LogEventHandler to handlers if you need to push java logs to LOGEVENT appender

handlers=java.util.logging.FileHandler, java.util.logging.ConsoleHandler

# Default global logging level.
# This specifies which kinds of events are logged across
# all loggers.  For any given facility this global level
# can be overriden by a facility specific level
# Note that the ConsoleHandler also has a separate level
# setting to limit messages printed to the console.
.level= INFO

############################################################
# Handler specific properties.
# Describes specific configuration info for Handlers.
#

java.util.logging.FileHandler.level = FINE
java.util.logging.FileHandler.pattern = /path/to/custom.log
java.util.logging.FileHandler.limit = 50000
java.util.logging.FileHandler.count = 1
java.util.logging.FileHandler.formatter = java.util.logging.SimpleFormatter
java.util.logging.SimpleFormatter.format = [%1$tY-%1$tm-%1$td %1$tk:%1$tM:%1$tS,%1$tL]  %4$s {%2$s} - %5$s %6$s %n
java.util.logging.FileHandler.filter = om.xyz.filters.CustomFilter

java.util.logging.ConsoleHandler.level = INFO


############################################################
# Facility specific properties.
# Provides extra control for each logger.
############################################################

# For example, set the com.xyz.foo logger to only log SEVERE
# messages:
#com.xyz.foo.level = SEVERE
com.package.name.level = FINE

Answer 1

问题是缺少访问修饰符。

当类没有使用访问修饰符指定时，它默认为private-package，它只在包中可见。因此，FileHandler 将.filter 属性读取为空。当它更改为public 时，过滤器被采用。更正后的代码可以在下面找到。

public class CustomFilter implements Filter {

 public boolean isLoggable(LogRecord record) {
    return record.getLoggerName().indexOf("com.package.name") != -1;
 }
}

Answer 2

这可能不是您问题的完整答案，但在我看来，您正试图从无用的噪音中过滤掉 Web 应用程序中的日志。我实际上写了一个开源库来处理这个问题。您可以配置与您相关的包，该实用程序将非常巧妙地过滤掉堆栈跟踪，这样您仍然会看到包括“由”跟踪在内的跟踪，但无用的包将被过滤掉。您可以将此库作为 Maven 工件（包括 javadoc 和源代码）或作为您可以自己修改的源代码来获取。这是一篇文章，描述了该实用程序的功能以及从何处获取它。 Open Source Java library with stack trace filtering, Silent String parsing Unicode converter and Version comparison。请参阅“Stacktrace 噪声过滤器”段落