Parse an Apache log file with StringTokenizer
/*
* Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
*
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* modification, are permitted provided that the following conditions
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* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
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*
* Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
* cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
* pioneering role in inventing and promulgating (and standardizing) the Java
* language and environment is gratefully acknowledged.
*
* The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
* inventing predecessor languages C and C++ is also gratefully acknowledged.
*/
import java.util.*;
/**
* Parse an Apache log file with StringTokenizer
*/
public class LogStrTok implements LogExample {
public static void main(String argv[]) {
StringTokenizer matcher = new StringTokenizer(logEntryLine);
System.out.println("tokens = " + matcher.countTokens());
// StringTokenizer CAN NOT count if you are changing the delimiter!
// if (matcher.countTokens() != NUM_FIELDS) {
// System.err.println("Bad log entry (or bug in StringTokenizer?):");
// System.err.println(logEntryLine);
// }
System.out.println("Hostname: " + matcher.nextToken());
// StringTokenizer makes you ask for tokens in order to skip them:
matcher.nextToken(); // eat the "-"
matcher.nextToken(); // again
System.out.println("Date/Time: " + matcher.nextToken("]"));
//matcher.nextToken(" "); // again
System.out.println("Request: " + matcher.nextToken("\""));
matcher.nextToken(" "); // again
System.out.println("Response: " + matcher.nextToken());
System.out.println("ByteCount: " + matcher.nextToken());
System.out.println("Referer: " + matcher.nextToken("\""));
matcher.nextToken(" "); // again
System.out.println("User-Agent: " + matcher.nextToken("\""));
}
}
/**
* Common fields for Apache Log demo.
*/
interface LogExample {
/** The number of fields that must be found. */
public static final int NUM_FIELDS = 9;
/** The sample log entry to be parsed. */
public static final String logEntryLine = "123.45.67.89 - - [27/Oct/2000:09:27:09 -0400] \"GET /java/javaResources.html HTTP/1.0\" 200 10450 \"-\" \"Mozilla/4.6 [en] (X11; U; OpenBSD 2.8 i386; Nav)\"";
}
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