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【日志库】—— log4cpp 部署套路

news 来源：原创 2025/5/16 7:54:22

部署：

1、安装log4cpp，执行如下指令进行编译安装
log4cpp的官网是：
http://log4cpp.sourceforge.net/
wget https://nchc.dl.sourceforge.net/project/log4cpp/log4cpp-1.1.x%20%28new%29/log4cpp-1.1/log4cpp-1.1.3.tar.gz
tar xzvf log4cpp-1.1.3.tar.gz
cd log4cpp-1.1.3
./configure  
make
make install
安装完毕后，log4cpp库路径在 /usr/local/lib、头文件路径在 /usr/local/include/log4cpp

可以使用命令 mv 拷贝到自己的项目路径中去；例如，创建一个lib文件夹，将刚刚安装的log4cpp的lib库文件拷贝到此文件夹中。

头文件同理。

示例1：

#include <log4cpp/Category.hh>
#include <log4cpp/FileAppender.hh>
#include <log4cpp/PatternLayout.hh>
#include <log4cpp/OstreamAppender.hh>
#include <log4cpp/PropertyConfigurator.hh>

#define LOG(__level) log4cpp::Category::getRoot() << log4cpp::Priority::__level << __FILE__ << " " << __LINE__ << ": "

int main() {

        log4cpp::PropertyConfigurator::configure("log4cpp.conf");

        log4cpp::Category &root = log4cpp::Category::getRoot();
        root.setPriority(log4cpp::Priority::INFO);

        LOG(DEBUG) << "i am happy.";
        LOG(INFO)  << "oh, you happy, we happy.";
        LOG(NOTICE)<< "please do not contact me. ";
        LOG(WARN)  << "i am very busy now.";
        LOG(ERROR) << "oh, what happed?";

    return 0;
}

创建 test.conf：日志的配置文件

#定义Root category的属性
log4cpp.rootCategory=DEBUG, RootLog

#定义RootLog属性
log4cpp.appender.RootLog=RollingFileAppender
log4cpp.appender.RootLog.layout=PatternLayout
#log4cpp.appender.RootLog.layout.ConversionPattern=%d{% m-%d %H:%M:%S %l} [%t][%p]%m%n
log4cpp.appender.RootLog.layout.ConversionPattern=%d{%m-%d %H:%M:%S %l} [%t][%p]%m%n

#日志位置：自定义
log4cpp.appender.RootLog.fileName=/root/log/test/dry.log
log4cpp.appender.RootLog.maxFileSize=268435456 #256MB
log4cpp.appender.RootLog.fileNamePattern=dry_%i.log
log4cpp.appender.RootLog.maxBackupIndex=256

示例2：

#include <log4cpp/Category.hh>
#include <log4cpp/FileAppender.hh>
#include <log4cpp/PatternLayout.hh>
#include <log4cpp/OstreamAppender.hh>
#include <log4cpp/PropertyConfigurator.hh>

#define LOG(__level) log4cpp::Category::getRoot() << log4cpp::Priority::__level << __FILE__ << " " << __LINE__ << ": "

int main() {
    // 输出到std::cout 控制台
    //log4cpp::Appender *appender = new log4cpp::OstreamAppender("root", &std::cout);

    // 配置日志输出到当前目录的 log.log 日志文件中
    log4cpp::Appender *appender = new log4cpp::FileAppender("root", "log.log");
    appender->setLayout(new log4cpp::BasicLayout());

        log4cpp::PatternLayout *patternLayout = new log4cpp::PatternLayout();
        patternLayout->setConversionPattern("%d [%p] - %m%n");
        appender->setLayout(patternLayout);

        log4cpp::Category &root = log4cpp::Category::getRoot();
        root.setPriority(log4cpp::Priority::INFO);
        root.addAppender(appender);

        LOG(DEBUG) << "i am happy.";
        LOG(INFO)  << "oh, you happy, we happy.";
        LOG(NOTICE)<< "please do not contact me. ";
        LOG(WARN)  << "i am very busy now.";
        LOG(ERROR) << "oh, what happed?";

    return 0;
}