LOG4J Multiple Loggers in same class

I have a java project that has a log4j logging. It uses a rolling file appender and multiple loggers to log to a file. I want to add a DBappender and have a seperate logger that only writes to this appender, with none of the other loggers sending messages to it. I need, say one class 开发者_如何学Goto have two loggers, one writing to the fileAppender and one writing to the dbAppender. Is this possible, if so what is the configuration for it?

Thanks

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It's possible to use two Loggers in one class.

First idea: get the two loggers with different names:

package com.mycompany.apackage.MyClass;

public class MyClass {
    private static final logger = Logger.getLogger(Myclass.class)
    private static final dbLogger = Logger.
        getLogger(Myclass.class.getName() + ".dblogger")
}

Config for the package of the dbLogger:

<root> 
    <appender-ref ref="mainlog" /> 
</root> 

<logger name="com.mycompany.apackage.MyClass.dblogger">
    <appender-ref ref="dbappender" />
</logger>

(Not tested.) In that case the dbLogger also logs to the mainlog appender. If it's not appropriate you could use a custom filter in the mainlog (and other) appenders which filters out the messages of the dbLogger. Another solution is using a completely different prefix for the dbLogger:

    private static final logger = Logger.getLogger(Myclass.class)
    private static final dbLogger = Logger.
        getLogger("dblogger." + Myclass.class.getName())

Log4j config:

<root> 
</root> 

<logger name="com.mycompany">
    <appender-ref ref="mainlog" />
</logger>
<logger name="dblogger.com.mycompany">
    <appender-ref ref="dbappender" />
</logger>

Note that if you pass the same parameter to the getLogger() method you will get same Logger object, so you have to use different names.