I am modifying a tutorial I found on how to create a TCP Chat Server that accepts multiple clients. I will eventually create a client class as well, but so far I am testing it with TELNET.
I want the server to continually check for input so I can use key words to preform server functions. So string word "EXIT" to disconnect the client and the string word "Name:" to print "OK".
This is what I was thinking but it doesn't work:
public void run()
{
String line;
try
{
while(true)
{
if (input.readline("EXIT"))//Should close and remove client
{
clients.remove(this);
users.remove(name);
break;
}
if(input.readline("Name:"))//Should print OK with username
{
System.out.println("OK");
}
boradcast(name,line); // method of outer class - send messages to all
}// end of while
} // try
catch(Exception e)
{
System.out.println(e.getMessage());
}
} // end of run()
}
}
Here is the whole server class
// Chat Server runs at port no. 9020
import java.io.*;
import java.util.*;
import java.net.*;
import static java.lang.System.out;
public class TCPServer
{
Vector<String> users = new Vector<String>();
Vector<HandleClient> clients = new Vector<HandleClient>();
int PORT = 9020;
int NumClients = 10;
public void process() throws Exception
{
ServerSocket server = new ServerSocket(PORT,NumClients);
out.println("Server Connected...");
while( true)
{
Socket client = server.accept();
HandleClient c = new HandleClient(client);
clients.add(c);
} // end of while
}
public static void main(String ... args) throws Exception
{
new TCPServer().process();
} // end of main
public void boradcast(String user, String message)
{
// send message to all connected users
for (HandleClient c : clients)
if (!c.getUserName().equals(user))
{
c.sendMessage(user,message);
}
}
class HandleClient extends Thread
{
String name = "";
BufferedReader input;
PrintWriter output;
public HandleClient(Socket client) throws Exception
{
// get input and output streams
input = new BufferedReader(new InputStreamReader(client.getInputStream())) ;
output = new PrintWriter (client.getOutputStream(),true);
output.println("Welcome to Bob's Chat Server!\n");
// read name
output.println("Please Enter a User Name: ");
name = input.readLine();
users.add(name); // add to vector
output.println("Welcome "+name+" we hope you enjoy your chat today");
start();
}
public void sendMessage(String uname,String msg)
{
output.println( uname + ":" + msg);
}
public String getUserName()
{
return name;
}
public void run()
{
String line;
try
{
while(true)
{
if (input.readline("EXIT"))
{
clients.remove(this);
users.remove(name);
break;
}
if(input.readline(name))
{
System.out.println("OK");
}
boradcast(name,line); // method of outer class - send messages to all
}// end of while
} // try
catch(Exception e)
{
System.out.println(e.getMessage());
}
} // end of run()
} // end of inner class
} // end of Server
Without knowing exactly what you're looking to do when an input line equals the current username, I think this is more what you're looking for:
public void run(){
try{
while(true){
String line = input.readLine();
if("EXIT".equals(line)){
clients.remove(this);
users.remove(name);
break;
}else if(name.equals(line)){
System.out.println("OK");
}
boradcast(name, line); // method of outer class - send messages to all
}// end of while
} // try
catch(Exception e){
System.out.println(e.getMessage());
}
} // end of run()
This addresses a few issues:
input.readline
is not a method, but input.readLine
is - and it doesn't accept any parameters. (This should have shown up as a compile error.) line
String. name
- loosing whatever the user had entered for the previous line.
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