Question

我有以下log4j.properties文件：

cached_network_image

运行MyApp时，我将获取MyApp.log文件。我想知道是否可以在代码中为两个主类设置两个文件？像这样：

log.path=/var/log/MyApp


log4j.rootLogger=INFO, file

log4j.appender.file = org.apache.log4j.RollingFileAppender
log4j.appender.file.File = MyApp.log
log4j.appender.file.Append = true
log4j.appender.file.MaxFileSize=10MB
log4j.appender.file.MaxBackupIndex=1000
log4j.appender.file.DatePattern = '.'yyy-MM-dd
log4j.appender.file.layout = org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern =%d{yyyy-MM-dd HH:mm:ss} %t/%c{1} [%p] %m%n

然后，当我运行Myapp1时，它将创建Myapp1.log；当我运行Myapp2时，它将创建Myapp2.log

Answer 1

可以在 log4j.properties 文件中对文件名进行参数化，并作为JVM参数传递

log4j.appender.file = org.apache.log4j.RollingFileAppender
log4j.appender.file.File = ${ApplicationName}.log

可以将 ApplicationName 作为具有实际文件名的JVM参数传递

-DApplicationName=Myapp1

相同的 log4j.properties 文件可以由两个应用程序共享，并且您可以在每个应用程序的JVM参数中传递应用程序名称。

Answer 2

您可以像这样为单个类配置日志文件-

log4j.logger.com.logger.test.logger_test.MyApp1=DEBUG, appender1
log4j.additivity.com.logger.test.logger_test.MyApp1=false
log4j.appender.appender1=org.apache.log4j.DailyRollingFileAppender
log4j.appender.appender1.File=logs/MyApp1.log
log4j.appender.appender1.layout=org.apache.log4j.PatternLayout

log4j.logger.com.logger.test.logger_test.MyApp2=DEBUG, appender2
log4j.additivity.com.logger.test.logger_test.MyApp2=false
log4j.appender.appender2=org.apache.log4j.DailyRollingFileAppender
log4j.appender.appender2.File=logs/MyApp2.log
log4j.appender.appender2.layout=org.apache.log4j.PatternLayout

示例：

public class Myapp1 {
        
    Logger logger = Logger.getLogger(Myapp1.class);
        
    public Myapp1() {
        logger.debug("In Myapp1");
    }
}
        
public class Myapp2 {
    Logger logger = Logger.getLogger(Myapp2.class);
        
    public Myapp2() {
        logger.debug("In Myapp2");
    }
}
        
public class App {
    public static void main( String[] args ){
        Myapp1 myapp1 = new Myapp1();
        Myapp2 myapp2 = new Myapp2();
    }
}

如何创建两个日志文件

2 个答案: