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log4cxx第三篇----使用多个logger
使用多个logger时,所有logger的配置写在一个配置文件里面
两个例子:
1 一个继承的例子(http://logging.apache.org/log4cxx/)
// file com/foo/bar.h#include "log4cxx/logger.h"namespace com { namespace foo { class Bar { static log4cxx::LoggerPtr logger; public: void doIt(); } }}
// file bar.cpp#include "com/foo/bar.h"using namespace com::foo;using namespace log4cxx;LoggerPtr Bar::logger(Logger::getLogger("com.foo.bar"));void Bar::doIt() { LOG4CXX_DEBUG(logger, "Did it again!")}
log4j.rootLogger=DEBUG, A1log4j.appender.A1=org.apache.log4j.ConsoleAppenderlog4j.appender.A1.layout=org.apache.log4j.PatternLayout# Print the date in ISO 8601 formatlog4j.appender.A1.layout.ConversionPattern=%d [%t] %-5p %c - %m%n# Print only messages of level WARN or above in the package com.foo.log4j.logger.com.foo=WARN
// file MyApp2.cpp#include "com/foo/bar.h"using namespace com::foo;// include log4cxx header files.#include "log4cxx/logger.h"#include "log4cxx/basicconfigurator.h"#include "log4cxx/propertyconfigurator.h"#include "log4cxx/helpers/exception.h"using namespace log4cxx;using namespace log4cxx::helpers;// Define a static logger variable so that it references the// Logger instance named "MyApp".LoggerPtr logger(Logger::getLogger("MyApp"));int main(int argc, char **argv){ int result = EXIT_SUCCESS; try { if (argc > 1) { // BasicConfigurator replaced with PropertyConfigurator. PropertyConfigurator::configure(argv[1]); } else { BasicConfigurator::configure(); } LOG4CXX_INFO(logger, "Entering application.") Bar bar bar.doIt(); LOG4CXX_INFO(logger, "Exiting application.") } catch(Exception&) { result = EXIT_FAILURE; } return result;}
The output of MyApp configured with this file is shown below.
2000-09-07 14:07:41,508 [12345] INFO MyApp - Entering application.2000-09-07 14:07:41,529 [12345] INFO MyApp - Exiting application.
2 使用多个logger
前置知识
- log4cxx可以使用配置文件进行设置,并且其设置方式与log4j兼容;
- log4cxx库对日志流设置,只需更改配置文件中的appender属性;
- log4cxx支持Logger继承机制,默认会继承父Logger的appender,由于要将日志流输出到多个文件中,因此需要将子Logger的继承属性设置为false.
配置子Logger
为了最大程度的灵活性,log4cxx引入了子Logger这个概念,即拥有与父Logger不同的行为,和编程语言中的OOP概念一致。
下面是在配置文件中定义一个子Logger的代码,其中ap0是logger0使用的appender:
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- log4j.logger.logger0 = TRACE, ap0
设置子Logger不继承父Logger的appender:
设置子Logger所使用的日志文件,下述代码将logger0的日志文件设定为当前程序目录下的0.log:[plain] view plaincopyprint?
- log4j.additivity.logger0=false
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- log4j.appender.ap0.File=./0.log
在程序中获取子Logger实例
首先是加载配置文件:
获取子Logger实例:[plain] view plaincopyprint?
- log4cxx::PropertyConfigurator::configure(配置文件名称);
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- log4cxx::LoggerPtr logger = log4cxx::Logger::getLogger(子Logger名[例如上文中的"logger0"]);
FreeJudger项目中使用的完整配置文件
下述代码配置了8个子Logger,用于FreeJudger项目中判题线程的日志:
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- log4j.additivity.gather = false
- log4j.rootLogger=TRACE
- log4j.logger.logger0 = TRACE, ap0
- log4j.logger.logger1 = TRACE, ap1
- log4j.logger.logger2 = TRACE, ap2
- log4j.logger.logger3 = TRACE, ap3
- log4j.logger.logger4 = TRACE, ap4
- log4j.logger.logger5 = TRACE, ap5
- log4j.logger.logger6 = TRACE, ap6
- log4j.logger.logger7 = TRACE, ap7
- log4j.logger.logger8 = TRACE, ap8
- log4j.additivity.logger0=false
- log4j.additivity.logger1=false
- log4j.additivity.logger2=false
- log4j.additivity.logger3=false
- log4j.additivity.logger4=false
- log4j.additivity.logger5=false
- log4j.additivity.logger6=false
- log4j.additivity.logger7=false
- log4j.additivity.logger8=false
- log4j.appender.logfile.encoding=UTF-8
- log4j.appender.stdout=org.apache.log4j.ConsoleAppender
- log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
- log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n
- log4j.appender.R.MaxFileSize=100KB
- log4j.appender.ap0=org.apache.log4j.RollingFileAppender
- log4j.appender.ap0.ImmediateFlush=true
- log4j.appender.ap0.File=./0.log
- log4j.appender.ap0.MaxBackupIndex=10
- log4j.appender.ap0.layout=org.apache.log4j.PatternLayout
- log4j.appender.ap0.layout.ConversionPattern=%5p %d{HH:mm:ss} -- %m%n
- log4j.appender.ap1=org.apache.log4j.RollingFileAppender
- log4j.appender.ap1.ImmediateFlush=true
- log4j.appender.ap1.File=./1.log
- log4j.appender.ap1.MaxBackupIndex=10
- log4j.appender.ap1.layout=org.apache.log4j.PatternLayout
- log4j.appender.ap1.layout.ConversionPattern=%5p %d{HH:mm:ss} -- %m%n
- log4j.appender.ap2=org.apache.log4j.RollingFileAppender
- log4j.appender.ap2.ImmediateFlush=true
- log4j.appender.ap2.File=./2.log
- log4j.appender.ap2.MaxBackupIndex=10
- log4j.appender.ap2.layout=org.apache.log4j.PatternLayout
- log4j.appender.ap2.layout.ConversionPattern=%5p %d{HH:mm:ss} -- %m%n
- log4j.appender.ap3=org.apache.log4j.RollingFileAppender
- log4j.appender.ap3.ImmediateFlush=true
- log4j.appender.ap3.File=./3.log
- log4j.appender.ap3.MaxBackupIndex=10
- log4j.appender.ap3.layout=org.apache.log4j.PatternLayout
- log4j.appender.ap3.layout.ConversionPattern=%5p %d{HH:mm:ss} -- %m%n
- log4j.appender.ap4=org.apache.log4j.RollingFileAppender
- log4j.appender.ap4.ImmediateFlush=true
- log4j.appender.ap4.File=./4.log
- log4j.appender.ap4.MaxBackupIndex=10
- log4j.appender.ap4.layout=org.apache.log4j.PatternLayout
- log4j.appender.ap4.layout.ConversionPattern=%5p %d{HH:mm:ss} -- %m%n
- log4j.appender.ap5=org.apache.log4j.RollingFileAppender
- log4j.appender.ap5.ImmediateFlush=true
- log4j.appender.ap5.File=./5.log
- log4j.appender.ap5.MaxBackupIndex=10
- log4j.appender.ap5.layout=org.apache.log4j.PatternLayout
- log4j.appender.ap5.layout.ConversionPattern=%5p %d{HH:mm:ss} -- %m%n
- log4j.appender.ap6=org.apache.log4j.RollingFileAppender
- log4j.appender.ap6.ImmediateFlush=true
- log4j.appender.ap6.File=./6.log
- log4j.appender.ap6.MaxBackupIndex=10
- log4j.appender.ap6.layout=org.apache.log4j.PatternLayout
- log4j.appender.ap6.layout.ConversionPattern=%5p %d{HH:mm:ss} -- %m%n
- log4j.appender.ap7=org.apache.log4j.RollingFileAppender
- log4j.appender.ap7.ImmediateFlush=true
- log4j.appender.ap7.File=./7.log
- log4j.appender.ap7.MaxBackupIndex=10
- log4j.appender.ap7.layout=org.apache.log4j.PatternLayout
- log4j.appender.ap7.layout.ConversionPattern=%5p %d{HH:mm:ss} -- %m%n
- log4j.appender.ap8=org.apache.log4j.RollingFileAppender
- log4j.appender.ap8.ImmediateFlush=true
- log4j.appender.ap8.File=./8.log
- log4j.appender.ap8.MaxBackupIndex=10
- log4j.appender.ap8.layout=org.apache.log4j.PatternLayout
- log4j.appender.ap8.layout.ConversionPattern=%5p %d{HH:mm:ss} -- %m%n
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