log4cxx配置文件讲解，以及测试程序

先看完整配置文件log4cxx.properties

log4j.additivity.gather = false  log4j.rootLogger= debug, R, stdout//设置子loggerlog4j.logger.Lib_a =debug, ap1, stdoutlog4j.logger.Lib_b =debug, ap2, stdout#设置不继承父Loggerlog4j.additivity.Lib_a=false  log4j.additivity.Lib_b=false  log4j.appender.logfile.encoding=UTF-8    //标准输出，向控制台打印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 //Rootlog4j.appender.R=org.apache.log4j.RollingFileAppenderlog4j.appender.R.File=./hello.loglog4j.appender.R.MaxFileSize=100KBlog4j.appender.R.MaxBackupIndex=10log4j.appender.R.layout=org.apache.log4j.PatternLayoutlog4j.appender.R.layout.ConversionPattern==%d [%c]-[%p] %m%n log4j.appender.ap1=org.apache.log4j.RollingFileAppenderlog4j.appender.ap1.File=./hello_a.loglog4j.appender.ap1.MaxFileSize=100KBlog4j.appender.ap1.MaxBackupIndex=10log4j.appender.ap1.layout=org.apache.log4j.PatternLayoutlog4j.appender.ap1.layout.ConversionPattern==%d{yyyy-MM-dd} [%c]-[%p] %m%nlog4j.appender.ap2=org.apache.log4j.RollingFileAppenderlog4j.appender.ap2.File=./hello_b.loglog4j.appender.ap2.MaxFileSize=100KBlog4j.appender.ap2.MaxBackupIndex=10log4j.appender.ap2.layout=org.apache.log4j.PatternLayoutlog4j.appender.ap2.layout.ConversionPattern==%d{yyyy-MM-dd HH:mm:ss} [%c]-[%p] %m%n 

程序使用方法

// include log4cxx header files.#include <log4cxx/logger.h>#include <log4cxx/basicconfigurator.h>#include <log4cxx/helpers/exception.h>#include <log4cxx/propertyconfigurator.h>using namespace log4cxx;using namespace log4cxx::helpers;//LoggerPtr logger(Logger::getLogger("R"));LoggerPtr logger_lib_a(Logger::getLogger("Lib_a"));LoggerPtr logger_lib_b(Logger::getLogger("Lib_b"));int main(int argc, char **argv){    try    {        // Set up a simple configuration that logs on the console.       PropertyConfigurator::configure("log4cxx.properties");        //LOG4CXX_INFO(logger, "test R")        LOG4CXX_DEBUG(logger_lib_a, "test R.a")        LOG4CXX_DEBUG(logger_lib_b, "test R.b")    }    catch(...)    {    }    return 0;}

注意事项：

1. 

log4j.rootLogger= debug, R, stdout

//设置子logger
log4j.logger.Lib_a =debug, ap1, stdout
log4j.logger.Lib_b =debug, ap2, stdout

在这里rootLogger，“L”要大写，下面设置子logger，“l”要小写，这个仿佛是log4cxx规定的。

2. 

#设置不继承父Logger
log4j.additivity.Lib_a=false  
log4j.additivity.Lib_b=false  

这里一定要设置继承关系为非继承，否则子logger设置的属性就白设置了

3.

//设置子logger
log4j.logger.Lib_a =debug, ap1, stdout
log4j.logger.Lib_b =debug, ap2, stdout

子logger要加上stdout，否则会没有控制台打印，stdout设置如下

//标准输出，向控制台打印
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 

4. 

LoggerPtr logger_lib_a(Logger::getLogger("Lib_a"));
LoggerPtr logger_lib_b(Logger::getLogger("Lib_b"));

获取logger的时候一定要用append的名，如上。