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Utility classes ArrayList and Hashmap set up to help analyse data file
Fundamental classes example from a Well House Consultants training course
More on Fundamental classes [link]
Source code: Tshirt.java Module: J714
import java.io.*;
import java.util.*; /* Read data from a server log file and count the number of accesses to lines containing a certain word "Swindon". Use the ArrayList and HashMap utility classes to get a list of the IP addresses, and a table of the IP addresses with a note of how many times each has been used. */ public class Tshirt { public static void main (String [] args) throws FileNotFoundException, IOException { int countplace = 0, countlines = 0; int iptop; String RemoteIp; BufferedReader Suck = new BufferedReader(new FileReader(args[0])); String Stuff; // Read and store all Swindon interest by IP ArrayList<String> Iprecords = new ArrayList<String>(); // Also store a count of visits from each different IP HashMap Counters = new HashMap(); while ((Stuff = Suck.readLine()) != null) { countlines ++; iptop = Stuff.indexOf(" "); RemoteIp = Stuff.substring(0,iptop); if (Stuff.indexOf("Swindon") >= 0) { // Store onto an ArrayList Iprecords.add(RemoteIp); // Also store into a HashMap // Get count so far for this IP from Hashmap Integer temp = (Integer)Counters.get(RemoteIp); // If this is an IP we have not seen before, set 0 if (temp == null) temp = new Integer(0); // Store one more than previous value into Hashmap Integer newval = new Integer(1+temp.intValue()); Counters.put(RemoteIp,newval); countplace++; } } System.out.println("Total " + countlines); System.out.println("Matched " + countplace); // And print out IP list too for (int k=0; k<Iprecords.size(); k++) { String iprecalled = Iprecords.get(k); System.out.println(iprecalled); } System.out.println("----------------"); // Print out IP list with times each occurred from the HashMap // Get the keys so that we can handle them each in turn [keyset] Set HostKeys = Counters.keySet(); // Make an iterator which can step through the keyset one by one Iterator It = HostKeys.iterator(); // "while we still have data available from the iterator ..." while (It.hasNext()) { // " ... get the next piece of data [key]" String HostNow = (String)(It.next()); int c = ((Integer)Counters.get(HostNow)).intValue(); // Print out the IP addresses and the counts alongside System.out.println((String)HostNow + " - " + c); } } } /* Sample output - wizard:jn10 graham$ java Tshirt ac_20101105 Total 134652 Matched 49 207.46.195.225 67.195.112.232 67.195.112.232 66.249.65.122 207.46.195.234 66.249.65.122 208.115.111.250 209.51.162.220 207.46.13.98 207.46.195.230 95.150.152.116 195.246.108.11 195.246.108.11 195.246.108.11 195.246.108.11 207.46.13.44 195.246.108.11 207.46.204.222 207.46.204.222 66.249.66.134 66.249.66.134 66.249.66.134 67.195.115.231 66.249.66.59 77.88.27.25 66.249.66.119 66.249.66.130 66.249.66.130 66.249.66.130 66.249.66.130 66.249.66.130 66.249.66.130 66.249.66.130 66.249.66.130 66.249.66.130 66.249.66.130 66.235.124.57 207.46.204.233 66.249.66.119 66.249.66.119 67.195.112.232 66.249.66.119 79.142.66.55 220.181.94.224 217.160.182.81 217.160.182.81 217.160.182.81 217.160.182.81 66.249.66.119 ---------------- 66.249.66.130 - 10 95.150.152.116 - 1 66.249.66.59 - 1 207.46.204.222 - 2 195.246.108.11 - 5 207.46.204.233 - 1 220.181.94.224 - 1 209.51.162.220 - 1 77.88.27.25 - 1 207.46.13.98 - 1 66.249.66.134 - 3 217.160.182.81 - 4 66.235.124.57 - 1 67.195.115.231 - 1 207.46.195.230 - 1 207.46.195.225 - 1 67.195.112.232 - 3 207.46.13.44 - 1 66.249.65.122 - 2 208.115.111.250 - 1 79.142.66.55 - 1 66.249.66.119 - 5 207.46.195.234 - 1 wizard:jn10 graham$ */ Learn about this subject
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