（1）官网的一个例子

• #include 
        
         #include 
         
          #include 
          
           #include 
           
            #include 
            
             int main() {   log4cxx::FileAppender * fileAppender = newlog4cxx::FileAppender(log4cxx::LayoutPtr(new log4cxx::SimpleLayout()),"logfile", false);   log4cxx::helpers::Pool p;   fileAppender->activateOptions(p);   log4cxx::BasicConfigurator::configure(log4cxx::AppenderPtr(fileAppender));   log4cxx::Logger::getRootLogger()->setLevel(log4cxx::Level::getDebug());   log4cxx::LoggerPtr logger = log4cxx::Logger::getLogger("logger");   LOG4CXX_INFO(logger,"Created FileAppender appender");   return 0;}
            
           
          
         
        

（2）一个只使用代码的例子dailyrollingfileappender(经过验证)

 

ostringstream oss;  oss << getpid();  string pid= oss.str();  MDC::put("pid", oss.str()); //使得layout中可以携带进程号信息 PatternLayoutPtr layout = new PatternLayout();        string conversionPattern = "[%p] %d %c %M - %m%n";        layout->setConversionPattern(conversionPattern);        // creates daily rolling file appender        DailyRollingFileAppenderPtr rollingAppenderptr = new DailyRollingFileAppender();        rollingAppenderptr->setFile("/opt/bre/LrSortService/log/LrSortService.log."+pid);        rollingAppenderptr->setDatePattern("'.'yyyy-MM-dd");        rollingAppenderptr->setLayout(layout);        log4cxx::helpers::Pool p;        rollingAppenderptr->activateOptions(p);        // configures the root logger        log4cxx::LoggerPtr logger = log4cxx::Logger::getRootLogger();        logger->setLevel(log4cxx::Level::getDebug());        logger->addAppender(rollingAppenderptr);        LOG4CXX_INFO(logger,"Created FileAppender appender");

(3)一个例子。使用RollingFileAppender和

TimeBasedRollingPolicy（未经验证）

private static void log4jConfig(String actionName) {
         org.apache.log4j.Logger rootLogger = LogManager.getRootLogger();    RollingFileAppender fileAppender = (RollingFileAppender)rootLogger.getAppender("fileAppender");    //     String currentLogFile = fileAppender.getFile();    String newLogPattern = currentLogFile.replace(LOG4J_ROLLING_FILE_NAME_TOKEN, actionName);    fileAppender.setFile(newLogPattern);    TimeBasedRollingPolicy timeBasedRollingPolicy = (TimeBasedRollingPolicy) fileAppender.getRollingPolicy();    String fileNamePattern = timeBasedRollingPolicy.getFileNamePattern();    String newFileNamePattern = fileNamePattern.replace(LOG4J_ROLLING_FILE_NAME_TOKEN, actionName);;    timeBasedRollingPolicy.setFileNamePattern(newFileNamePattern);    timeBasedRollingPolicy.activateOptions();    fileAppender.activateOptions();    LOG.info("  Redirected launcher log output to log pattern: " + newFileNamePattern);}

(4)一个使用xml配置文件和代码协同工作的例子。（有问题）

参考：http://stackoverflow.com/questions/29769018/log4cxx-timebasedrollingpolicy-wont-keep-old-log-when-used-programtically

i'm trying use log4cxx combined with xml file and code in multiprocess, hope each process create a log and can rollback in TimeBasedRollingPolicy. here is my xml file:

then my code:

void LrSortService::InitLog(const std::string& logconf) {  ostringstream oss;  oss << getpid();  MDC::put("pid", oss.str());  DOMConfigurator::configure(logconf);  LoggerPtr logger(log4cxx::Logger::getRootLogger());  FileAppenderPtr oldappenderptr;  oldappenderptr = logger->getAppender("bfd_recommend_appender");    string oldfile = oldappenderptr->getFile();    string pid = oss.str();    string newfile1 = oldfile + ".";    string newfile  = newfile1 + pid;    oldappenderptr->setFile(newfile);    log4cxx::helpers::Pool p;    oldappenderptr->activateOptions(p);  cout<<"set log OK , log filename is: "<
    
     <
    

what i got:

-rw-rw-r-- 1 bre bre  1809500 Apr 20 23:59 LrSortService.log.20150420-rw-rw-r-- 1 bre bre 26807477 Apr 21 17:37 LrSortService.log.20150420.2297-rw-rw-r-- 1 bre bre 23429289 Apr 21 17:37 LrSortService.log.20150420.2374-rw-rw-r-- 1 bre bre 23546280 Apr 21 17:37 LrSortService.log.20150420.2451-rw-rw-r-- 1 bre bre 22566813 Apr 21 17:37 LrSortService.log.20150420.2528

and yesterday i got:

LrSortService.log.20150420.2297    LrSortService.log.20150420.2374    LrSortService.log.20150420.2451    LrSortService.log.20150420.2528

what i meant to get is (today is 20150421):

LrSortService.log.20150420.2297    LrSortService.log.20150420.2374    LrSortService.log.20150420.2451    LrSortService.log.20150420.2528    LrSortService.log.20150421.2297    LrSortService.log.20150421.2374    LrSortService.log.20150421.2451    LrSortService.log.20150421.2528

any help will be appreciated ,thanks !