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‎Capture.PNG

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‎ChatBot.java

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import java.util.*;
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import java.text.*;
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public class ChatBot
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{
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public TreeMap<String,String> quesResponseMap=null;
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public TreeMap<String,String> localQuesResponseMap=null;
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public Set<String> questions=null;
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public Collection<String> answers=null;
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public String botAnswer="";
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public String chatHistory="";
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public String username="";
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public static final String BOT_INTRO="Hi! I am ChatBot 1.0 \nEnter your name ...\n";
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public static final String SORRY_RESPONSE = "Sorry! I did't get you.";
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public static final String SYSTEM_ERROR ="Sorry! there is an error in my system.";
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public static final String LEARN_REQUEST ="WHat should be my answer to this statement?";
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public static final String EXIT ="BYE! Have a nice day.";
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public static final String DATABASE ="KnowledgeBase.txt";
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public static final String BOT_NAME="Bot : ";
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public ChatBot() throws Exception
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{
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this.quesResponseMap=KnowledgeBase.getKnowledgeBase(ChatBot.DATABASE);
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this.localQuesResponseMap = new TreeMap<String,String>();
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if(this.quesResponseMap == null)
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this.botAnswer=ChatBot.SORRY_RESPONSE ;
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else
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{
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questions = quesResponseMap.keySet();
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answers = quesResponseMap.values();
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}
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}
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public String saveQuestionAndResponse(String question , String response)
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{
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this.quesResponseMap.put(question,response);
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this.localQuesResponseMap.put(question,response);
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this.botAnswer="Okey. Got it!";
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return this.botAnswer;
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}
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public String getResponse(String question)
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{
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double globalRank=0.200;
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String localQuestion="";
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try{
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for(String ques:questions)
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{
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double localRank=StringSimilarity.similarity(ques,question);
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if(globalRank <localRank)
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{
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globalRank = localRank;
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localQuestion=ques;
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}
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}
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if(localQuestion.trim()!=""){
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this.botAnswer=quesResponseMap.get(localQuestion);
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if(this.botAnswer.trim().toLowerCase().contains("timedate")) {this.botAnswer = new Date().toString();}
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}
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else
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this.botAnswer=ChatBot.SORRY_RESPONSE+" "+ChatBot.LEARN_REQUEST;
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}catch(Exception e)
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{
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this.botAnswer=ChatBot.SYSTEM_ERROR;
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}
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return this.botAnswer;
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}
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public void checkExit(String exitStmt) throws Exception
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{
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if(exitStmt.toLowerCase().contains("exit"))
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{
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this.chatHistory += ChatBot.BOT_NAME+ChatBot.EXIT;
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System.out.print(ChatBot.BOT_NAME+ChatBot.EXIT );
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KnowledgeBase.saveNewKnowledge(this.localQuesResponseMap,ChatBot.DATABASE);
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KnowledgeBase.saveLogs(this.chatHistory,this.username);
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System.exit(0);
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}
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}
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public static void main(String arg[]) throws Exception
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{
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Scanner sc= new Scanner(System.in);
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ChatBot cb= new ChatBot();
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System.out.println(ChatBot.BOT_INTRO);
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cb.username=sc.nextLine();
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cb.chatHistory += "\n\n"+ChatBot.BOT_NAME+"Hi "+cb.username+". How can I help you?\r\n";
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System.out.println("\n\n"+ChatBot.BOT_NAME+"Hi "+cb.username+". How can I help you?");
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while(true)
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{
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System.out.print(cb.username+" : ");
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String question = sc.nextLine();
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cb.chatHistory += cb.username+" : "+question+"\r\n";
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cb.checkExit(question.trim());
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String response = cb.getResponse(question);
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cb.chatHistory += ChatBot.BOT_NAME+response+"\r\n";
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System.out.println(ChatBot.BOT_NAME+response);
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if(response.toLowerCase().contains("sorry"))
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{
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System.out.print(cb.username+" : ");
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response = sc.nextLine();
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cb.chatHistory += cb.username+" : "+response;
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cb.checkExit(response.trim());
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cb.chatHistory += ChatBot.BOT_NAME+cb.saveQuestionAndResponse(question,response)+"\r\n";
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System.out.println(ChatBot.BOT_NAME+cb.saveQuestionAndResponse(question,response));
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}
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}
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}
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}

‎KnowledgeBase.java

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import java.util.*;
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import java.io.*;
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import java.text.*;
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public class KnowledgeBase
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{
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public static TreeMap<String,String> quesResponseMap=null;
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public static TreeMap<String,String> getKnowledgeBase(String fileName) throws Exception
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{
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quesResponseMap = new TreeMap<String,String>();
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RandomAccessFile raf = new RandomAccessFile(fileName, "rw");
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raf.seek(0);
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while(raf.getFilePointer()<raf.length())
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{
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String line= raf.readLine().trim();
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if(!line.trim().isEmpty()){
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String[] lines = line.split("~");
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String question = lines[0];
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String answer = lines[1];
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quesResponseMap.put(question,answer);
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}
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}
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raf.close();
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return quesResponseMap;
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}
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public static void saveNewKnowledge(TreeMap<String,String> newKnowledge ,String fileName) throws Exception
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{
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RandomAccessFile raf = new RandomAccessFile(fileName, "rw");
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long fileLength = raf.length();
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raf.seek(fileLength);
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String toBeWritten="\n";
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for(Map.Entry<String,String> entry : newKnowledge.entrySet()) {
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String key = entry.getKey();
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String value = entry.getValue();
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toBeWritten += key+" ~ "+value+"\r\n";
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}
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raf.writeBytes(toBeWritten);
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raf.close();
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}
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public static void saveLogs(String chat,String username) throws Exception
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{
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File dir = new File(System.getProperty("user.dir")+"/logs");
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dir.mkdir();
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Date date = new Date() ;
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SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss") ;
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String fileName="Chat History with "+username+" on "+dateFormat.format(date)+".txt";
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File file = new File(dir,fileName);
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file.createNewFile();
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RandomAccessFile raf = new RandomAccessFile(file, "rw");
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raf.writeBytes(chat);
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raf.close();
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}
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}

‎KnowledgeBase.txt

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How are You ~ I am Fine. What About you?
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What is your name ~ My name is ChatBot 1.0
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where do you live ~ I live in your system
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I am Fine ~ That's Good.
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‎StringSimilarity.java

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import java.util.Scanner;
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public class StringSimilarity {
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public static double similarity(String s1, String s2) {
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String longer = s1, shorter = s2;
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if (s1.length() < s2.length()) {
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longer = s2; shorter = s1;
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}
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int longerLength = longer.length();
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if (longerLength == 0) { return 1.0; }
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return (longerLength - editDistance(longer, shorter)) / (double) longerLength;
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}
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public static int editDistance(String s1, String s2) {
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s1 = s1.toLowerCase();
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s2 = s2.toLowerCase();
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int[] costs = new int[s2.length() + 1];
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for (int i = 0; i <= s1.length(); i++) {
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int lastValue = i;
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for (int j = 0; j <= s2.length(); j++) {
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if (i == 0)
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costs[j] = j;
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else {
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if (j > 0) {
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int newValue = costs[j - 1];
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if (s1.charAt(i - 1) != s2.charAt(j - 1))
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newValue = Math.min(Math.min(newValue, lastValue),
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costs[j]) + 1;
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costs[j - 1] = lastValue;
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lastValue = newValue;
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}
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}
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}
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if (i > 0)
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costs[s2.length()] = lastValue;
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}
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return costs[s2.length()];
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}
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public static void printSimilarity(String s, String t) {
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System.out.println(String.format(
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"%.3f is the similarity between \"%s\" and \"%s\"", similarity(s, t), s, t));
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}
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}

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