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Access Log analysis / String Tokenizer
Fundamental classes example from a Well House Consultants training course
More on Fundamental classes [link]
Source code: Access.java Module: J714
/* Access Log analysis in Java - example
This example uses the StringTokenizer to separate out the various fields on a line ... a web log file has different delimiters along the line, so we have the separator being changed as we go! */ import java.util.*; import java.io.*; // for test program only public class Access { // Access Log file (NCSA format) analysis String Host; String Time; String Request; String Method; String URL; int status; int size = 0; String Referer; String UserAgent; /* Sample data line: 180.193.30.81 - - [11/Nov/2010:03:32:39 +0000] "GET /resources/J703.html HTTP/1.1" 200 21984 "http://www.wellho.net/course/sjfull.html" "Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.9.0.19) Gecko/2010031422 Firefox/3.0.19" */ public Access (String Data) { StringTokenizer Splitter = new StringTokenizer(Data," \t"); String skip; Host = Splitter.nextToken(); skip = Splitter.nextToken(); skip = Splitter.nextToken("["); Time = Splitter.nextToken(" \t"); skip = Splitter.nextToken("\""); Request = Splitter.nextToken(); skip = Splitter.nextToken(" \t"); status = Integer.parseInt(Splitter.nextToken(" \t")); try { size = Integer.parseInt(Splitter.nextToken(" \t")); } catch (Exception e) { size = 0; } skip = Splitter.nextToken("\""); Referer = Splitter.nextToken(); skip = Splitter.nextToken(); UserAgent = Splitter.nextToken(); // Use another String Tokenizer on the HTTP Request Splitter = new StringTokenizer(Request); Method = Splitter.nextToken(); URL = Splitter.nextToken(); } // Test code public static void main (String [] args) throws IOException { BufferedReader Source = new BufferedReader( new FileReader( args[0])); String Line = Source.readLine(); Access Earliest = new Access(Line); System.out.println("Access to web page "+Earliest.URL); System.out.println("Information returned (in bytes) "+Earliest.size); System.out.println("Called by "+Earliest.UserAgent); } } /* Sample Output: munchkin:j714 grahamellis$ java Access ac_20101111 Access to web page /resources/J703.html Information returned (in bytes) 21984 Called by Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.9.0.19) Gecko/2010031422 Firefox/3.0.19 munchkin:j714 grahamellis$ */ Learn about this subject
This module and example are covered on the following public courses:
* Learning to Program in Java * Java Bootcamp * Java Programming for the Web Also available on on site courses for larger groups Books covering this topic
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This example comes from our "Fundamental classes" training module. You'll find a description of the topic and some
other closely related examples on the "Fundamental classes" module index page.
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