技術メモ帳

$ gem install log4r
Successfully installed log4r-1.1.10
1 gem installed
Installing ri documentation for log4r-1.1.10...
Installing RDoc documentation for log4r-1.1.10...

$ gem list

*** LOCAL GEMS ***

actionmailer (2.3.14)
actionpack (2.3.14)
activerecord (2.3.14)
activeresource (2.3.14)
activesupport (2.3.14)
cgi_multipart_eof_fix (2.5.0)
gem_plugin (0.2.3)
log4r (1.1.10)
mongrel (1.1.5 x86-mingw32)
mongrel_cluster (1.0.5)
mongrel_service (0.4.0)
mysql (2.8.1 x86-mingw32)
rack (1.1.3)
rails (2.3.14)
rake (0.8.7)
rubygems-update (1.3.7)

require 'Log4r'
Rails::Initializer.run do |config|
  # 出力先の設定
  config.log_path = "#{RAILS_ROOT}/log/#{Rails.env}.log"
  # フォーマット設定
  formatter = Log4r::PatternFormatter.new(
    :pattern => "[%d][%C][%l][%X{:pid}]: [%X{:env}] -- %M",
    :date_format => "%Y/%m/%d %H:%M:%S"
  )
  # 標準出力（コマンドプロンプト）
  outputter1 = Log4r::StdoutOutputter.new(STDOUT, :formatter => formatter)
  # ファイル出力
  outputter2 = Log4r::FileOutputter.new(
    'file',
    :filename => config.log_path,
    :trunc => false,
    :formatter => formatter
  )

  logger = Log4r::Logger.new("Practice")
  logger.add(outputter1, outputter2)
  config.logger = logger
  config.logger.level = Log4r::INFO  #(DEBUG|INFO|WARN|ERROR|FATAL)
  Log4r::MDC.put :pid, $$            # %X{:pid}
  Log4r::MDC.put :env, Rails.env     # %X{:env}
end

logger.debug "#{__FILE__}:#{__LINE__}"
logger.info  "#{__FILE__}:#{__LINE__}"
logger.warn  "#{__FILE__}:#{__LINE__}"
logger.error "#{__FILE__}:#{__LINE__}"
logger.fatal "#{__FILE__}:#{__LINE__}"

[2012-12-24 19:23:00][Practice][INFO][6264]: [development] -- RAILS_ROOT/app/controllers/lists_controller.rb:13
[2012-12-24 19:23:00][Practice][WARN][6264]: [development] -- RAILS_ROOT/app/controllers/lists_controller.rb:14
[2012-12-24 19:23:00][Practice][ERROR][6264]: [development] -- RAILS_ROOT/app/controllers/lists_controller.rb:15
[2012-12-24 19:23:00][Practice][FATAL][6264]: [development] -- RAILS_ROOT/app/controllers/lists_controller.rb:16