RandomAccessFile ...
I am trying to detect new error message in error log file.
- in an error log file, as there is a new error message logged. my
application will need to mail this error message to admin.
- I am thinking of using RandomAccessFile to do this.
- as there is more error message logged, I advance the File pointer,
and read the error message.
Can you give out some pesudo-code --> detect new lines written to the
log file. I had never use RandomAccessFile class before and don't know
how to use it.
[565 byte] By [
ulukb00] at [2007-9-26 1:33:18]
I am using this code but doesn't work:
==============================================
code to email error msg to admin as more error logged to error log
file.
==============================================
import java.io.*;
public class random {
public static void main (String[] args) {
String thisLine;
try{
RandomAccessFile r = new RandomAccessFile
("d:/apache/logs/access.log", "r");
// infinite loop to poll error log for error
while ( true ){
// if has more error msg, then email
if ( (thisLine = r.readLine()) != null )
System.out.println(thisLine);
//send an email of error to admin
}
} catch ( Exception e ){
}
}
}
Thanks.
i tried this code, it works on winnt. try it and tell me if it doesn't work on win2k. i see no reason why it shouldn't.
it prints "file changed" whenever i access a html page (which writes about this to the access.log file).
import java.io.File;
public class FileChangePolling {
public static void main( String[] args ) throws Exception {
File file = new File("d:\\apache 1.3.20\\apache\\logs\\access.log");
long lastModified = file.lastModified();
long currentCheckedTime = 0;
while( true ) {
System.out.print(".");
currentCheckedTime = file.lastModified();
if( currentCheckedTime > lastModified ) {
System.out.println("file changed");
lastModified = currentCheckedTime;
} // end of if( )
else {
try {
Thread.sleep( 2000 );
}
catch( InterruptedException ie ) {
System.out.println("thread sleep interrupted: " + ie);
}
}
}
}
