简介
前一段时间用过log4Qt，只是零零散散的使用了。没有仔细的深究。抱着能用就行的心态终于遇到坑了。在网上也没有系统的介绍Log4Qt的文章。现在系统介绍下。希望对自己和别人有所帮助。log4Qt是根据Apache的log4j修改过来的，所有里面用的时候也会有jave的影子。需要详细的学习的同学可以搜说log4j的资料。因为log4Qt的资料太少太少了。
log4qt基本框架
| logger | 用来写日志。(根logger和普通属于从属关系) Log4Qt::Logger::rootLogger() 【根logger】Log4Qt::Logger::Logger(“XXX”)【可以自己命名】 |
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| Appender | 日志的输出位置，输出到文件，控制台，数据库等 consoleAppender（配置输出到控制台） FileAppender（配置输出到文件） 。。。 |
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| Layout | 配置日志的输出格式。 PartternLayout（）根据格式字符串输出日志事件 SimpleLayout() 输出日志记录的级别和消息 TTCCLayout()：输出日志事件的时间、线程名称、Logger名称和嵌套的诊断上下文信息。 |
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使用实例
1.通过配置文件使用logger
log4qt中通过QSetting配置config文件直接使用，代码如下：
配置日志输出到文件：
LoggerFile 类采用了单例模式,使用的时候调用get_instance()->debug(QString)直接输出;
logger_file.h
class LoggerFile : public QObject
{
Q_OBJECT
public:
explicit LoggerFile(QObject *parent = 0);
~LoggerFile();
static LoggerFile *get_instance(const char *, int, const char *);
static LoggerFile *get_instance();
void init_file_setting();
void init_file_logger();
void debug(const QVariant&);
void waring(const QVariant&);
void info(const QVariant&);
void error(const QVariant&);
private:
Log4Qt::Logger *m_file_logger;
QString m_file_path;
QSettings *m_file_setting;
static LoggerFile *m_instance;
static QString m_filter;
};logger_file.cc
LoggerFile* LoggerFile::m_instance = NULL;
QString LoggerFile::m_filter = "";
LoggerFile::LoggerFile(QObject *parent)
{
setParent(parent);
m_file_path = QDir::homePath() + "/.pangen_gui" + "/pgui_log/";
init_file_setting();
Log4Qt::PropertyConfigurator::configure(*m_file_setting);
init_file_logger();
}
LoggerFile::~LoggerFile()
{
delete m_instance;
m_instance = NULL;
}
LoggerFile *LoggerFile::get_instance(const char *fileName, int lineNumber, const char *functionName)
{
m_filter = QString("[FILE:%1, LINE(%2)]: ").arg(fileName).arg(lineNumber);
QMutex m_mutex;
m_mutex.lock();
if(NULL == m_instance)
{
m_instance = new LoggerFile();
}
m_mutex.unlock();
return m_instance;
}
LoggerFile *LoggerFile::get_instance()
{
QMutex m_mutex;
m_mutex.lock();
if(NULL == m_instance)
{
m_instance = new LoggerFile();
}
m_mutex.unlock();
return m_instance;
}
void LoggerFile::init_file_setting()
{
QString configFile_path = QDir::homePath()+ "/.pangen_gui" + "/pgui_config";
QDir dir(configFile_path);
if (!dir.exists())
{
if(!dir.mkpath(configFile_path))
{
qDebug() << "make config_dir error !";
return;
}
}
m_file_setting = new QSettings(configFile_path + "/qtlogger_file.conf", QSettings::IniFormat);
m_file_setting->clear();
m_file_setting->setValue("log4j.rootLogger", "debug,dailyFile");
m_file_setting->setValue("log4j.appender.dailyFile", "org.apache.log4j.DailyRollingFileAppender");
m_file_setting->setValue("log4j.appender.dailyFile.File", m_file_path + QDateTime::currentDateTime().toString("yyyyMMdd")+ ".log");
m_file_setting->setValue("log4j.appender.dailyFile.AppendFile", "true");
m_file_setting->setValue("log4j.appender.dailyFile.layout", "org.apache.log4j.PatternLayout");
m_file_setting->setValue("log4j.appender.dailyFile.layout.ConversionPattern", "%-d{yyyy-MM-dd HH:mm:ss.zzz} [%p] %m%n");
}
void LoggerFile::init_file_logger()
{
QDir Log_Dir(m_file_path);
if (!Log_Dir.exists())
{
if (Log_Dir.mkpath(m_file_path))
{
qDebug() << "make log file path error!";
}
}
m_file_logger = Log4Qt::Logger::logger("File");
}
void LoggerFile::debug(const QVariant& Text)
{
m_file_logger->debug(m_filter + Text.toString());
}
void LoggerFile::waring(const QVariant& Text)
{
m_file_logger->warn(m_filter + Text.toString());
}
void LoggerFile::info(const QVariant& Text)
{
m_file_logger->info(m_filter + Text.toString());
}
void LoggerFile::error(const QVariant& Text)
{
m_file_logger->error(m_filter + Text.toString());
}
使用配置文件的方法,把日志输出到控制台中:
Logger_console.h
class LoggerConsole : public QObject
{
Q_OBJECT
public:
explicit LoggerConsole(QObject *parent = 0);
~LoggerConsole();
const LoggerConsole& operator<<(QVariant);
void init_console_setting();
void init_console_logger();
static LoggerConsole *get_instance(const char *, int, const char *);
void debug(const QVariant&);
void waring(const QVariant&);
void info(const QVariant&);
void error(const QVariant&);
// QString variant_to_string(const QVariant&);
private:
Log4Qt::Logger *m_console_logger;
QSettings *m_console_setting;
static LoggerConsole *m_instance;
static QString m_filter;
};Logger_console.cc
LoggerConsole::LoggerConsole(QObject *parent):
QObject(parent)
{
init_console_setting();
Log4Qt::PropertyConfigurator::configure(*m_console_setting);
Log4Qt::LogManager::setHandleQtMessages(true);
init_console_logger();
}
LoggerConsole::~LoggerConsole()
{
delete m_instance;
m_instance = NULL;
}
void LoggerConsole::init_console_setting()
{
QString configFile_path = QDir::homePath()+ "/.pangen_gui" + "/pgui_config";
QDir dir(configFile_path);
if (!dir.exists())
{
if(!dir.mkpath(configFile_path))
{
qDebug() << "make config_dir error !";
return;
}
}
m_console_setting = new QSettings(configFile_path + "/qtlogger_console.conf", QSettings::IniFormat);
m_console_setting->clear();
m_console_setting->setValue("log4j.rootLogger", "DEBUG, console");
m_console_setting->setValue("log4j.appender.console", "org.apache.log4j.ConsoleAppender");
m_console_setting->setValue("log4j.appender.console.layout", "org.apache.log4j.PatternLayout");
m_console_setting->setValue("log4j.appender.console.layout.ConversionPattern", "%-d{yyyy-MM-dd HH:mm:ss.zzz} [%p] %m%n");
}
const LoggerConsole& LoggerConsole::operator<<(QVariant data)
{
debug(data);
return *this;
}
void LoggerConsole::init_console_logger()
{
m_console_logger = Log4Qt::Logger::logger("Debug");
}
LoggerConsole *LoggerConsole::get_instance(const char *fileName, int lineNumber, const char *functionName)
{
m_filter = QString("[FILE:%1, LINE(%2)]: ").arg(fileName).arg(lineNumber);
QMutex m_mutex;
m_mutex.lock();
if(NULL == m_instance)
{
m_instance = new LoggerConsole();
}
m_mutex.unlock();
return m_instance;
}
void LoggerConsole::debug(const QVariant &Text)
{
m_console_logger->debug(m_filter + Text.toString());
}
void LoggerConsole::waring(const QVariant &Text)
{
m_console_logger->warn(m_filter + Text.toString());
}
void LoggerConsole::info(const QVariant &Text)
{
m_console_logger->info(m_filter + Text.toString());
}
void LoggerConsole::error(const QVariant &Text)
{
m_console_logger->error(m_filter + Text.toString());
}