Log4Qt日志框架 - 日志格式化（02）https://mp.csdn.net/mp_blog/creation/editor/138417616?spm=1011.2266.3001.6217

一、Log4Qt输出重定向

Log4Qt继承关系图

1. AppenderSkeleton：实现一般的功能
2. DebugAppender：将日志附加到平台调试（Window-stdout或Linux-stdrr）
3. ListAppender：将日志追加到列表
4. NullAppender：忽略所有附加请求
5. WriteAppender：将日志附加到QTextStream
   1. ConsoleAppender：附加到stdout或stdrr
   2. FileAppender：将日志信息附加到文件
   3. DailRollingFileAppender：以指定频率滚动日志文件
   4. RollingFileAppender：以达到指定大小时滚动日志文件

1、输出到控制台

#include "log4qt/logger.h"
#include "log4qt/logmanager.h"
#include "log4qt/fileappender.h"
#include "log4qt/loggerrepository.h"
#include "log4qt/patternlayout.h"
#include "log4qt/consoleappender.h"
#include "log4qt/simplelayout.h"
#include "log4qt/ttcclayout.h"int main(int argc, char *argv[])
{QApplication a(argc, argv);#if 1// 创建一个 TTCCLayout（输出时间、线程、Logger 以及消息内容）Log4Qt::Logger *logger = Log4Qt::Logger::rootLogger();Log4Qt::TTCCLayout *layout = new Log4Qt::TTCCLayout();layout->setName("My Layout");layout->activateOptions();// 创建一个 ConsoleAppender（将日志内容输出到控制台上）Log4Qt::ConsoleAppender *appender = new Log4Qt::ConsoleAppender(layout, Log4Qt::ConsoleAppender::STDOUT_TARGET);appender->setName("My Appender");appender->activateOptions();// 在 logger 上添加 appenderlogger->addAppender(appender);// 设置级别为 DEBUGlogger->setLevel(Log4Qt::Level::DEBUG_INT);// 输出信息logger->debug("Hello, Log4Qt!");// 关闭 loggerlogger->removeAllAppenders();logger->loggerRepository()->shutdown();
#endifreturn a.exec();
}

2、输出到文件

#include "log4qt/logger.h"
#include "log4qt/logmanager.h"
#include "log4qt/fileappender.h"
#include "log4qt/loggerrepository.h"
#include "log4qt/patternlayout.h"
#include "log4qt/consoleappender.h"
#include "log4qt/simplelayout.h"
#include "log4qt/ttcclayout.h"int main(int argc, char *argv[])
{QApplication a(argc, argv);#if 1// 创建一个 TTCCLayout（输出时间、线程、Logger 以及消息内容）Log4Qt::Logger *logger = Log4Qt::Logger::rootLogger();Log4Qt::TTCCLayout *layout = new Log4Qt::TTCCLayout();layout->setName("My Layout");layout->activateOptions();// 创建一个 FileAppender（将日志内容输出到文件中）QString file = QCoreApplication::applicationDirPath() + "/Logs/out.log";Log4Qt::FileAppender *appender = new Log4Qt::FileAppender(layout, file, true);//true:append,false:truncateappender->setName("My Appender");appender->activateOptions();// 在 logger 上添加 appenderlogger->addAppender(appender);// 设置级别为 DEBUGlogger->setLevel(Log4Qt::Level::DEBUG_INT);// 输出信息logger->debug("Hello, Log4Qt!");// 关闭 loggerlogger->removeAllAppenders();logger->loggerRepository()->shutdown();
#endifreturn a.exec();
}

3、以指定频率滚动日志文件

DatePattern参数描述

枚举	模式字符串	描述
MINUTELY_ROLLOVER	"'.'yyyy-MM-dd-hh-mm"	每分钟
HOURLY_ROLLOVER	"'.'yyyy-MM-dd-hh"	每小时
HALFDAILY_ROLLOVER	"'.'yyyy-MM-dd-a"	每半天
DAILY_ROLLOVER（默认值）	"'.'yyyy-MM-dd"	每天
WEEKLY_ROLLOVER	"'.'yyyy-ww"	每周
MONTHLY_ROLLOVER	"'.'yyyy-MM"	每月

 注：单引号内的内容不会被处理，如：'.'

#include <qdir.h>
#include <qdebug.h>
#include <qthread.h>#include "log4qt/logger.h"
#include "log4qt/logmanager.h"
#include "log4qt/fileappender.h"
#include "log4qt/loggerrepository.h"
#include "log4qt/patternlayout.h"
#include "log4qt/consoleappender.h"
#include "log4qt/simplelayout.h"
#include "log4qt/ttcclayout.h"
#include "log4qt/dailyrollingfileappender.h"int main(int argc, char *argv[])
{QApplication a(argc, argv);#if 1qDebug() << "********** Begin **********";// 使用 rootLogger 打印日志Log4Qt::Logger *logger = Log4Qt::Logger::rootLogger();// 创建一个 TTCCLayout（输出时间、线程、Logger 以及消息内容）Log4Qt::TTCCLayout *layout = new Log4Qt::TTCCLayout();layout->setName("My Layout");layout->activateOptions();// 创建一个 DailyRollingFileAppender（以指定的频率滚动）Log4Qt::DailyRollingFileAppender *appender = new Log4Qt::DailyRollingFileAppender();appender->setName("My Appender");appender->setLayout(layout);appender->setFile(QCoreApplication::applicationDirPath() + "Logs/log.out");appender->setImmediateFlush(true);  // 立即刷新appender->setThreshold(Log4Qt::Level::INFO_INT);  // 设置阈值级别为 INFOappender->setAppendFile(true);  // 追加的方式appender->setDatePattern(Log4Qt::DailyRollingFileAppender::MINUTELY_ROLLOVER); // 日期模式appender->activateOptions();// 在 logger 上添加 appenderlogger->addAppender(appender);// 设置级别为 DEBUGlogger->setLevel(Log4Qt::Level::DEBUG_INT);int count = 0;while (count < 10) {// 输出信息logger->info("Hello, Log4Qt!");QThread::sleep(30);++count;}// 关闭 loggerlogger->removeAllAppenders();logger->loggerRepository()->shutdown();qDebug() << "********** End **********";
#endifreturn a.exec();
}

4、以达到指定大小时滚动文件

#include <qdir.h>
#include <qdebug.h>
#include <qthread.h>#include "log4qt/logger.h"
#include "log4qt/logmanager.h"
#include "log4qt/fileappender.h"
#include "log4qt/loggerrepository.h"
#include "log4qt/patternlayout.h"
#include "log4qt/consoleappender.h"
#include "log4qt/simplelayout.h"
#include "log4qt/ttcclayout.h"
#include "log4qt/dailyrollingfileappender.h"
#include "log4qt/rollingfileappender.h"int main(int argc, char *argv[])
{QApplication a(argc, argv);#if 1qDebug() << "********** Begin **********";// 使用 rootLogger 打印日志Log4Qt::Logger *logger = Log4Qt::Logger::rootLogger();// 创建一个 TTCCLayout（输出时间、线程、Logger 以及消息内容）Log4Qt::TTCCLayout *layout = new Log4Qt::TTCCLayout();layout->setName("My Layout");layout->activateOptions();// 创建一个 RollingFileAppender（滚动多个文件）Log4Qt::RollingFileAppender *appender = new Log4Qt::RollingFileAppender();appender->setName("My Appender");appender->setLayout(layout);appender->setFile(QCoreApplication::applicationDirPath() + "/Logs/log.out");appender->setImmediateFlush(true);  // 立即刷新appender->setThreshold(Log4Qt::Level::INFO_INT);  // 设置阈值级别为 INFOappender->setAppendFile(true);  // 追加的方式// 等价于 appender->setMaximumFileSize(10 * 1024);appender->setMaxFileSize("10KB"); // 在滚动之前设置文件的最大大小appender->setMaxBackupIndex(5);  // 设置备份索引appender->activateOptions();// 在 logger 上添加 appenderlogger->addAppender(appender);// 设置级别为 DEBUGlogger->setLevel(Log4Qt::Level::DEBUG_INT);for (int i = 0; i < 1000; i++){logger->info("write RollingFileAppender info to file");}// 关闭 loggerlogger->removeAllAppenders();logger->loggerRepository()->shutdown();qDebug() << "********** End **********";
#endifreturn a.exec();
}

5、输出到数据库