如何创建两个日志文件

Question

我有以下log4j.properties文件：

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

当我运行MyApp时，我会获得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？类似于：

object MyApp1 {
def main(args: Array[String]) = {
log4j.setName("File" -> "MyApp1.log")
println("HelloWorld")
}
}
object MyApp2 {
def main(args: Array[String]) = {
log4j.setName("File" -> "MyApp2.log")
println("HelloWorld")
}
}

然后，当我运行Myapp1时，它将创建Myapp1.log，当我将运行Myapp2时，它会创建Myapp2.log

Answer 1

文件名可以在log4j.properties文件中参数化，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作为带有实际文件名的JVM参数传递

-DApplicationName=Myapp1

两个应用程序可以共享相同的log4j.properties文件，并且可以在JVM参数中为每个应用程序传递应用程序名称。

Answer 2

您可以为像这样的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();
}
}