log4perl 如何同时写入 STDERR 和文件? [英] How can log4perl write to STDERR and a file at the same time?

问题描述

我尝试设置两个 appender，但它似乎只写入 STDERR:

I tried to set up two appenders, but it seems to only write to STDERR:

my $header = "######$scriptname $version";
use Log::Log4perl qw(:easy);
Log::Log4perl->easy_init($DEBUG);
my $logger = get_logger();
my $layout = Log::Log4perl::Layout::PatternLayout->new(
"%d %p> %F{1}:%L %M - %m%n");
my $appender = Log::Log4perl::Appender->new(
        "Log::Dispatch::File",
        filename=>$scriptname.".log",
        mode => "append"
);
$appender->layout($layout);
my $stderr = Log::Log4perl::Appender::Screen->new(
        stderr =>0,
        );

$stderr->layout($layout);
$logger->info($header);

推荐答案

将 easy_init 与自定义 appender 混合使用并不是一个好主意.您可以通过将 appender 添加到记录器 $logger->add_appender($appender) 来解决此问题.但这会导致重复的消息，因为您已经在 easy_init 中设置了 appender.

It's not a good idea to mix easy_init with custom appenders. You can fix this by adding appender to logger $logger->add_appender($appender). But this will result in duplicated messages, because you've already set appender in easy_init.

我建议您改用配置.您可以在代码中嵌入配置:

I suggest you to use configuration instead. You can embed configuration in you code:

use strict; use warnings;

use Log::Log4perl;

Log::Log4perl->init(\<<CONFIG);
log4perl.rootLogger = DEBUG, screen, file

log4perl.appender.screen = Log::Log4perl::Appender::Screen
log4perl.appender.screen.stderr = 0
log4perl.appender.screen.layout = PatternLayout
log4perl.appender.screen.layout.ConversionPattern = %d %p> %F{1}:%L %M - %m%n

log4perl.appender.file = Log::Log4perl::Appender::File
log4perl.appender.file.filename = 1.log
log4perl.appender.file.mode = append
log4perl.appender.file.layout = PatternLayout
log4perl.appender.file.layout.ConversionPattern = %d %p> %F{1}:%L %M - %m%n
CONFIG

my $logger = Log::Log4perl->get_logger();
$logger->info("my message");

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