Howdy,
I had actually implemented something like that for the system.out/.err
log ($CATALINA_HOME/logs/catalina.out by default) as well as the host
log ($CATALINA_HOME/logs/localhost_log.yyyy-mm-dd.txt by default). It's
not too difficult to implement:
- Add a <context-param> to the web.xml file to the context in which you
"log monitoring servlet" will run:
<context-param>
<param-name>tomcatLogDir</param-name>
<param-value>/var/tomcat/logs</param-value>
</context-param>
- Have your servlet simply open a FileReader (buffered ideally, although
you still have large memory consumption) to the file, e.g:
String logDir = getServletContext().getInitParameter("tomcatLogDir");
File systemOutLogFile = new File(logDir, "Catalina.out");
FileReader fileReader = new FileReader(systemOutLogFile);
BufferedReader bin = new BufferedReader(fileReader);
String line = null;
Out.println("System.out Log File Contents:");
while((line = bin.readLine()) != null) {
out.println(line);
}
bin.close();
fileReader.close();
Of course, I did all this before I started using log4j. When I started
using log4j, I eliminated all System.out, System.err, printStackTrace,
and getServletContext().log(...) calls. Everything went to log4j. I
now use Chainsaw for live monitoring (and filtering, and saving, and
more) of the log files. This solution is container-independent and thus
portable, unlike the above.
Yoav Shapira
Millennium ChemInformatics
>-----Original Message-----
>From: Peng Tuck Kwok [mailto:[EMAIL PROTECTED]]
>Sent: Monday, February 17, 2003 4:04 AM
>To: [EMAIL PROTECTED]
>Subject: Reading large log files with a servlet.
>
>I've noticed that app servers like Sun One allows a administrator to
>view the contents of the log file in the administrative interface. Has
>anyone have any experience in doing that with a servlet in tomcat ?
>Could you share you experience please ? Thanks.
>
>
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