log4cxx,rapidxml,boost::format组合demo

强大的log4cxx,rapidxml,boost组合起来更加强大：

#include "stdafx.h"

// include log4cxx header files.
#include <log4cxx/logger.h>
#include <log4cxx/basicconfigurator.h>
#include <log4cxx/propertyconfigurator.h>
#include <log4cxx/helpers/exception.h>
#include <rapidxml.hpp>
#include <rapidxml_print.hpp>
#include <iostream>
#include <boost/format.hpp>

log4cxx::LoggerPtr logger(log4cxx::Logger::getRootLogger());
log4cxx::LoggerPtr logger2(log4cxx::Logger::getLogger("secondlog"));
log4cxx::LoggerPtr logger3(log4cxx::Logger::getLogger("thirdlog"));

std::string rapidxml2string(const rapidxml::xml_document<>& doc)
{
    std::string doc_s;
    rapidxml::print(std::back_inserter(doc_s), doc, 0);
    return doc_s;
}


int main(int argc, char **argv)
{
    int result = EXIT_SUCCESS;
    try
    {
        LOG4CXX_INFO(logger, "Entering application.");
        for ( int i=0; i<10; i++ )
        {
            LOG4CXX_INFO(logger, "loop index:" << i);
        }
        
        for ( int j=0; j<1000; j++ )
        {
            LOG4CXX_INFO(logger2, "second loop index:" << j);
        }

        for ( int j=0; j<1000; j++ )
        {
            LOG4CXX_INFO(logger3, "third loop index:" << j);
        }

        std::string xml = "<r><name>ken</name><birth nation=\"china\">1983-11</birth></r>";
        rapidxml::xml_document<> doc;    // character type defaults to char
        doc.parse<0>((char*)xml.c_str());    // 0 means default parse flags
  
        std::cout << "Name of my first node is: " << doc.first_node()->name() << "\n";

        /// rapid xml control routine
        // access
        rapidxml::xml_node<> *node = doc.first_node()->first_node("birth");
        std::cout << "Node birth has value " << node->value() << "\n";
        for (rapidxml::xml_attribute<> *attr = node->first_attribute();
            attr; attr = attr->next_attribute())
        {
            std::cout << "Node birth has attribute " << attr->name() << " ";
            std::cout << "with value " << attr->value() << "\n";
        }

        // modify
        rapidxml::xml_node<>* new_node = doc.allocate_node(rapidxml::node_element, "a", "Google");
        doc.first_node()->append_node(new_node);
        rapidxml::xml_attribute<> *attr = doc.allocate_attribute("href", "google.com");
        new_node->append_attribute(attr);

        // print
        std::cout << "after modified:" << std::endl;
        std::string doc_s = rapidxml2string(doc);

        LOG4CXX_INFO(logger, boost::format("final xml:%s") % doc_s); // boost::format+log4cxx,powerful
        LOG4CXX_INFO(logger, "Exiting application.");
    }
    catch(log4cxx::helpers::Exception& e)
    {
        result = EXIT_FAILURE;
    }

    getchar();

    return result;
}

log4cxx的典型配置文件：

log4j.rootLogger=DEBUG, stdout, R
#log4j.rootLogger=debug, R

#log4j.rootLogger=debug, stdout
#log4j.rootLogger=debug

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

# Pattern to output the caller's file name and line number.
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %5p [%t] (%F:%L) - %m%n

log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=log/example.log

log4j.appender.R.MaxFileSize=2KB
# Keep one backup file
log4j.appender.R.MaxBackupIndex=5

log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %p %t %c - %m%n


#second log
log4j.logger.secondlog=DEBUG, a2
log4j.additivity.secondlog = false

log4j.appender.a2=org.apache.log4j.RollingFileAppender
log4j.appender.a2.File=log/second2.log

log4j.appender.a2.MaxFileSize=2KB
# Keep 5 backup file
log4j.appender.a2.MaxBackupIndex=5

log4j.appender.a2.layout=org.apache.log4j.PatternLayout
log4j.appender.a2.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %p %t %c - %m%n

#third log
log4j.logger.thirdlog=DEBUG, a3
log4j.additivity.thirdlog = false

log4j.appender.a3=org.apache.log4j.RollingFileAppender
log4j.appender.a3.File=log/thirdlog.log

log4j.appender.a3.MaxFileSize=2KB
# Keep 5 backup file
log4j.appender.a3.MaxBackupIndex=5

log4j.appender.a3.layout=org.apache.log4j.PatternLayout
log4j.appender.a3.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %p %t %c - %m%n