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ClientHandler.java
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ClientHandler.java
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import java.net.Socket;
import java.util.ArrayList;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.OutputStreamWriter;
import java.io.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class ClientHandler
{
public static ArrayList<ClientHandler> clientHandlers = new ArrayList<>();
private Socket socket;
private BufferedReader bufferReader;
private BufferedWriter bufferWriter;
private String clientUsername;
private String clientPassword;
private String newuser = "dlshskjhdkhskfiuwfwie6f7wyeffw8fw7fyw8yfe";
private String broadcaststring = "kljfldkfgge6r78g68g76er7ggeg87erwe67sdvx687bg7r7jy/8";
private String authorisechat = "jdshfkdjfhskuhfkdjfh564dfg65s4fb5d4bd6b@873gbdjkhkjf";
boolean login = false;
public ClientHandler(Socket socket)
{
try
{
while(!login)
{
createtable();
this.socket = socket;
this.bufferWriter = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
this.bufferReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
this.clientUsername = bufferReader.readLine();
this.clientPassword = bufferReader.readLine();
if(clientUsername.equals(newuser))
{
String nm = clientPassword;
String pas = bufferReader.readLine();
String rolno = bufferReader.readLine();
String depart = bufferReader.readLine();
adduser(nm, pas,rolno,depart);
this.clientUsername = nm;
this.clientPassword = pas;
login = true;
}
if(checkuser(clientUsername, clientPassword)=="True")
{
this.bufferWriter.write(authorisechat);
this.bufferWriter.newLine();
this.bufferWriter.flush();
clientHandlers.add(this);
broadcastMessage(" has entered the chat");
login = true;
getinput();
}
else
{
this.bufferWriter.write("You are not authorised to chat");
this.bufferWriter.newLine();
this.bufferWriter.flush();
//closeEverything(socket, bufferReader, bufferWriter);
}
}
}
catch(IOException e)
{
closeEverything(socket,bufferReader,bufferWriter);
}
}
public void getinput()
{
try
{
new Thread(
new Runnable()
{
@Override
public void run()
{
String messageFromClient;
while(socket.isConnected())
{
try
{
String header = bufferReader.readLine();
if(header.equals(broadcaststring))
{
messageFromClient = bufferReader.readLine();
broadcastMessage(messageFromClient);
}
}
catch(IOException e)
{
System.out.println("A Client exited");
closeEverything(socket,bufferReader,bufferWriter);
break;
}
}
}
}).start();
}
catch(Exception e)
{
closeEverything(socket, bufferReader, bufferWriter);
System.out.println("Client exited");
}
}
public void broadcastMessage(String messageToSend)
{
for(ClientHandler clientHandler : clientHandlers)
{
try
{
if(!clientHandler.clientUsername.equals(clientUsername))
{
clientHandler.bufferWriter.write(this.clientUsername+": "+messageToSend);
clientHandler.bufferWriter.newLine();
clientHandler.bufferWriter.flush();
}
}
catch(IOException e)
{
closeEverything(socket,bufferReader,bufferWriter);
}
}
}
public void removeClientHandler()
{
clientHandlers.remove(this);
broadcastMessage(" has left the chat");
}
public void closeEverything(Socket socket,BufferedReader bufferReader,BufferedWriter bufferWriter)
{
removeClientHandler();
try
{
if(bufferReader != null)
{
bufferReader.close();
}
if(bufferWriter != null)
{
bufferWriter.close();
}
if(socket != null)
{
socket.close();
}
}
catch(IOException e)
{
}
}
public void adduser(String name,String pass,String rollno,String department)
{
try
{
Connection con = DriverManager.getConnection("jdbc:derby:users;create=true");
PreparedStatement ps = con.prepareStatement("Insert into users values(?,?,?,?)");
ps.setString(1,name);
ps.setString(2,rollno);
ps.setString(3,pass);
ps.setString(4,department);
ps.executeUpdate();
con.commit();
con.close();
}
catch(Exception e)
{
e.printStackTrace();
System.out.println("Unable to add user");
}
}
public String checkuser(String name,String pass)
{
int count = 0;
try
{
Connection con = DriverManager.getConnection("jdbc:derby:users;create=true");
String sql="SELECT * FROM users";
Statement st = con.createStatement();
ResultSet rs = st.executeQuery(sql);
while(rs.next())
{
String uname = rs.getString("name");
String upass = rs.getString("pass");
if(name .equals(uname))
{
if(pass.equals(upass))
{
count = count+1;
}
}
}
}
catch(Exception e)
{
}
if(count>0)
{
return "True";
}
else
{
return "False";
}
}
public void createtable()
{
try
{
Connection con = DriverManager.getConnection("jdbc:derby:users;create=true");
Statement st = con.createStatement();
st.executeUpdate("Create table users(name varchar(30),rollno varchar(10),pass varchar(30),department varchar(30))");
System.out.println("dbCreated");
System.out.println("tableCreated");
con.commit();
con.close();
}
catch(Exception v)
{
}
}
}