grails log4j配置说明.docx

目录log4j组件2log4j日志级别2Grails log4j配置31.1.Loggers31.2.Root Logger31.3.Appenders41.4.Custom Layouts41.5.Full stacktraces51.6.additivity5示例6参考资料8log4j组件l Logger - 日志写出器，供程序员输出日志信息l Appender - 日志目的地，把格式化好的日志信息输出到指定的地方去n ConsoleAppender - 目的地为控制台的Appendern FileAppender - 目的地为文件的Appendern RollingFileAppender - 目的地为大小受限的文件的Appenderl Layout - 日志格式化器，用来把程序员的logging request格式化成字符串n PatternLayout - 用指定的pattern格式化logging request的Layoutlog4j日志级别msg levellogger levelTRACE DEBUGINFO WARN ERROR FATAL TRACE YYYYYYDEBUG NYYYYYINFO NNYYYYWARN NNNYYYERROR NNNNYYFATAL NNNNNYALL YYYYYYOFF NNNNNNGrails log4j配置1.1. Loggers 配置package的logger level,例如:log4j = / Set level for all application artifacts info grails.app / YourController类只写出debug及以上级别日志 debug grails.app.controllers.YourController / Set for a specific domain class debug .example.Book / Set for all taglibs info grails.app.taglib格式：grails.app.Grails 标准artifact：l conf- For anything undergrails-app/confsuch asBootStrap.groovy(but excluding filters)l filters- For filtersl taglib- For tag librariesl services- For service classesl controllers- For controllersl domain- For domain entitiesgrails默认配置： 1.2. Root Logger如果没有特别的配置，所有logger继承root logger，是默认日志配置。例如：log4j = appenders file name:file, file:/var/logs/mylog.log root debug stdout, file 1.3. Appenderslog4j = appenders rollingFile name: myAppender, maxFileSize: 1024, file: /tmp/logs/myApp.log/new 方式配置appender new DailyRollingFileAppender ( name: dailyAppender, maxFileSize: 1024, file: /tmp/logs/myDailyApp.log ) /stdout,只接收info及以上级别日志console name: stdout, threshold: org.apache.log4j.Level.INFO1.4. Custom Layoutslog4j = appenders console name: customAppender, layout: pattern(conversionPattern: %c2 %m%n) 1.5. Full stacktraces当发生异常时，grails过滤了非grail/groovy核心包产生的trace信息，如果开发者要查看没被过滤过的trace信息(full stacktraces)可查看stacktrace.log文件。相关配置：full stack traces to go to the console：error stdout: StackTraceredirects where stack traces are written to：log4j = appenders rollingFile name: stacktrace, maxFileSize: 1024, file: /var/tmp/logs/myApp-stacktrace.log dont want to the stacktrace appender at all：log4j = appenders null name: stacktrace 1.6. additivity不继承root logger 的标记，例如：默认所有包都只输出error级别及以上日志 到stdout中，additivity配置使grails.app.controllers.demo 包下的类会输出info级别及以上的日志到stdout中。示例Config.gro