processcount.java

对Windows系统产生的非常巨大的日志文件进行分累统计并进行格式打印.手动去搜索统计某个或几个你所关心事件或内容几乎不太可能。

/**
 * 
 */
package logfileAnalyse;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;
import java.util.TreeMap;
import java.util.Collections;

/**
 * @author Jack
 *
 */
public class ProcessCount extends EventCount {

	private static final int PRINT_MAX_LENGTH = 60; 
	private String ProcessEvent;
    private Map<String, Event> process;	
	public int eToPoffset;
	
	/**
	 * 
	 */
	public ProcessCount() {
		/*
		 * Initial the offset from the field of Event to the field of Process name
		 */
		eToPoffset = 7;
		ProcessEvent = "592";
		process = new TreeMap<String, Event>();
	}

	/**
	 * Accept filename to be analysed
	 * 
	 * @param fileIn
	 * 			filename to be analysed
	 */
	public ProcessCount(String filename) {
		this();
		fileIn = new File(filename);
		if (!fileIn.exists()) {
			System.err.println(filename + " doses not exits.");
			System.exit(1);
		}
		fileNum++;
	}
	
		/*
	    * Processes the data(from the log file ) one line at a time, tokenizes the
	    * events and stores the process in a TreeMap with the process as the key 
	    * and a process number as the value.	 
	    */
		public void calculate() {
			
		    BufferedReader reader = null;
		    String line = null;
		    StringTokenizer st = null;
		    
		    try{
		    	reader = new BufferedReader(new FileReader(fileIn));
		        line = reader.readLine();
		        while(line != null) {
		            st = new StringTokenizer(line, DELIMITER);
		            while(st.hasMoreTokens()) {
		            	String token = st.nextToken();
		            	if( isProcess(token) ) {
		            		for(int i = 0; i < eToPoffset; i++) {
			            		if(!st.hasMoreTokens())
			            			break;
		            			token = st.nextToken();
		            		}
		            		token = getProcessName(token);
		            		Event value = process.get(token);
		            		if(value == null)
	            				process.put(token, new Event(token));
		            		else {
		            			value.increment();
		            			process.put(token, value);
		            		}
		            	}
		            }
		            line = reader.readLine();
		         }
		    } catch(IOException ioe) {
		    	ioe.printStackTrace();
		    }
		}

		/*
		 * input string is process or not
		 */
		public boolean isProcess(String input) {
			
			
			if(input.equals(ProcessEvent))
				return true;
			else
				return false;
		}
		
		/*
		 * obtain the process directory and name from the input string
		 * 
		 * @param str
		 * 			input string
		 */
		public String getProcessName(String str) {
			String strPrefix = "Image File Name: ";
			String st;
			
			st = str.substring(strPrefix.length());
			
			return st;
		}
		
		/* (non-Javadoc)
		 * @see java.lang.Object#toString()
		 */
		@Override
		public String toString() {
					
		    StringBuffer strbf = new StringBuffer();
		    
		    String sEvt = "Process Name";
		    String sFrq = "Frequency";
		    String s1 = " ";
		    String s2 = "-";

		    List<Event> entries = new ArrayList<Event>();
		    entries.addAll(process.values());
		    Collections.sort(entries, new Event());
		       
			strbf.append(sEvt);
			for(int i = 0; i < (PRINT_MAX_LENGTH - sEvt.length() - sFrq.length()); i++)
				strbf.append(s1);
			
			strbf.append(sFrq).append(NEWLINE);
			for(int i = 0; i < PRINT_MAX_LENGTH; i++)
				strbf.append(s2);
			
			strbf.append(NEWLINE);
			
		    for(Event evt : entries) {
		    	evt.PRINT_MAX_LENGTH = PRINT_MAX_LENGTH;
		    	strbf.append(evt).append(NEWLINE);
		    }

			for(int i = 0; i < PRINT_MAX_LENGTH; i++)
				strbf.append(s2);

			strbf.append(NEWLINE);
		    
		    return new String(strbf);
	   }
		
	
}