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    <p>I see (from your code) that your main objective is to filter the <a href="http://logging.apache.org/log4j/1.2/apidocs/index.html" rel="nofollow noreferrer">log entries/events</a> and then write the filtered logs to database. You have 2 options</p> <p><strong>Option 1:</strong> <em>Best and the right way to do. But you should be able to change the log4j config file that comes with tomcat</em></p> <p>If this is the case then the best way to do this is to use log4j's predefined extension points. In your case the tapping point is the <a href="http://logging.apache.org/log4j/1.2/apidocs/index.html" rel="nofollow noreferrer">Appender</a></p> <p>Log4j already comes with the <a href="http://logging.apache.org/log4j/companions/receivers/apidocs/org/apache/log4j/db/DBAppender.html" rel="nofollow noreferrer">DBAppender</a> that you might want to extend to filter the logs using your regular expression and then delegate the rest to <a href="http://logging.apache.org/log4j/companions/receivers/apidocs/org/apache/log4j/db/DBAppender.html" rel="nofollow noreferrer">DBAppender</a> as it is well tested. Below is an example on how to configure the custome appender</p> <blockquote> <p>log4j.rootLogger=DEBUG, S</p> <p>log4j.appender.S=com.gurock.smartinspect.log4j.MyCustomAppender</p> <p>log4j.appender.S.layout=org.apache.log4j.SimpleLayout</p> </blockquote> <p>I suggest you also look at using the <a href="http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/AsyncAppender.html" rel="nofollow noreferrer">AsyncAppender</a> and DBAppender if you want to improve the performance.</p> <p><strong>Option 2:</strong> Fallback option if you doesn't have access to the tomcat's log4j config file</p> <p>Instead of writing your own file change listener, look <a href="https://stackoverflow.com/questions/494869/file-changed-listener-in-java">this post in SO</a>. Choose the one that best matches your needs. You are then only left with writing code for filtering and persisting the log in DB. You can use this <a href="http://www.javaworld.com/jw-01-1999/jw-01-step.html" rel="nofollow noreferrer">link as an example</a> for dealing with RandomAccessFile.</p>
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    1. CODid you mean the tomcat's log is generated by log4j,the logs are written to the localhost_access_log.2010-12-20.txt,and also it can be written to db? Before explored to db,I can do some filterting?
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    2. COI am guessing tomcat also uses log4j to generate the logs. If yes then you can filter and write it to the db by following my post. If the logs are not generated by log4j then you are left with option 2.
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