工具类库系列(七)-Logger

第七个工具类：Logger

就是用于输出日志的一个工具类，很简单，就是封装了一下boost库的log

不熟悉boost的log库的同学，可能就需要提前熟悉一下

本工具类，就是默认用exe的文件名比如“Test.exe”加上“_log”，组成一个文件夹名称“Test.exe_log”，

在Test.exe的同级目录下，创建这个文件夹“Test.exe_log”，所有的log都会输出到这个文件夹（这里就用到了之前的ExePath）

每个log对象，会有一个sinkname，用于将不同的日志输出到不同的文件中

比如，定义两个logger对象：

Logger g_SystemLog("System");
Logger g_LogicLog("Logic");

则向g_SystemLog输出的日志信息，将会输出到Test.exe_log/System_年月日.log的文件中

g_LogicLog输出的日志信息，将会输出到Test.exe_log/Logic_年月日.log的文件中

日志文件最后的那个后缀“_年月日”，会按照系统时间，每天换一次，即每到每天的00:00:00

则会以新的日期自动生成一个新文件

具体的日志输出用宏：

比如 ：LOG_INFO(g_SystemLog) << "你要输出的日志";

示例代码

#include "Logger.h"using namespace common::tool;Logger g_SystemLog("System");int main(int argc, char* argv[]){LOG_INFO(g_SystemLog) << "hello world";unsigned int a = 123;std::string b = "345";LOG_INFO(g_SystemLog) << "a = " << a << ", b = " << b;return 0;}

输出文件：

最后完整代码：

Logger.h

#ifndef __Logger_h__#define __Logger_h__#include <string>#include <boost/log/trivial.hpp>#include <boost/log/sources/severity_channel_logger.hpp>#define LOG_DEBUG(logObj) \BOOST_LOG_SEV(logObj.GetLog(), boost::log::trivial::debug) << "file:" << __FILE__ << "(" << __LINE__ << "):" << __FUNCTION__ << ":"#define LOG_INFO(logObj) \BOOST_LOG_SEV(logObj.GetLog(), boost::log::trivial::info) << "file:" << __FILE__ << "(" << __LINE__ << "):" << __FUNCTION__ << ":"#define LOG_ERROR(logObj) \BOOST_LOG_SEV(logObj.GetLog(), boost::log::trivial::error) << "file:" << __FILE__ << "(" << __LINE__ << "):" << __FUNCTION__ << ":"#define LOG_WARNING(logObj) \BOOST_LOG_SEV(logObj.GetLog(), boost::log::trivial::warning) << "file:" << __FILE__ << "(" << __LINE__ << "):" << __FUNCTION__ << ":"namespace common{namespace tool{class Logger{public:Logger(const std::string& sink);~Logger();boost::log::sources::severity_channel_logger<boost::log::trivial::severity_level, std::string>& GetLog(){return m_log;}private:void Init(const std::string& dir);boost::log::sources::severity_channel_logger<boost::log::trivial::severity_level, std::string> m_log;std::string m_SinkName;};}}#endif

Logger.cpp

#include "Logger.h"#include <boost/filesystem.hpp>#include <boost/log/sources/logger.hpp>  #include <boost/log/sources/record_ostream.hpp>  #include <boost/log/sources/global_logger_storage.hpp>  #include <boost/log/utility/setup/file.hpp>  #include <boost/log/utility/setup/common_attributes.hpp>  #include <boost/log/sinks/text_ostream_backend.hpp>  #include <boost/log/attributes/named_scope.hpp>  #include <boost/log/expressions.hpp>  #include <boost/log/support/date_time.hpp>  #include <boost/log/detail/format.hpp>  #include <boost/log/detail/thread_id.hpp>#include "ExePath.h"BOOST_LOG_INLINE_GLOBAL_LOGGER_DEFAULT(my_logger, boost::log::sources::severity_logger_mt<boost::log::trivial::severity_level>)namespace common{namespace tool{Logger::Logger(const std::string& sink) : m_SinkName(sink), m_log(boost::log::keywords::channel = sink){std::string fullName = GetExePathAndName();fullName += "_log";Init(fullName);}Logger::~Logger(){}void Logger::Init(const std::string& dir){if (!boost::filesystem::exists(dir)){boost::filesystem::create_directories(dir);}boost::shared_ptr<boost::log::sinks::text_file_backend> backend = boost::make_shared<boost::log::sinks::text_file_backend>(boost::log::keywords::open_mode = std::ios::app,boost::log::keywords::file_name = dir + "/" + m_SinkName + "_%Y%m%d.log",boost::log::keywords::rotation_size = 10 * 1024 * 1024,boost::log::keywords::time_based_rotation = boost::log::sinks::file::rotation_at_time_point(0, 0, 0));typedef boost::log::sinks::synchronous_sink<boost::log::sinks::text_file_backend> TextSink;boost::shared_ptr<TextSink> sink(new TextSink(backend));sink->set_formatter(boost::log::expressions::format("[%1% %2% %3%]:%4%")% boost::log::expressions::format_date_time<boost::posix_time::ptime>("TimeStamp", "%Y-%m-%d %H:%M:%S.%f")% boost::log::expressions::attr<boost::log::aux::thread::id>("ThreadID")% boost::log::expressions::attr<boost::log::trivial::severity_level>("Severity")% boost::log::expressions::smessage);sink->set_filter(boost::log::expressions::attr<std::string>("Channel") == m_SinkName);sink->locked_backend()->auto_flush(true);boost::log::core::get()->add_sink(sink);boost::log::add_common_attributes();}}}