tcp chat client server program in java
TCP chat client server program in java
Chat Program Java is a continuous communication between two systems. Networking chapter also (apart threads, DS etc.) proves that Java language is simple to develop applications that are difficult (requires extra practice and experience) in other languages.
Before going into the details of client-server communication, it is advised to go through Networking – Introduction and Communication with TCP/IP Protocol to know the terms and basics of networking and the way Java supports.
Chat communication is the process of exchanging messages between two systems continuously. Anyone can break the communication. Both systems come with the following same responsibilities.
- Reading from keyboard. Uses an input stream like BufferedReader connected to System.in.
- Sending data to the other system what is read from keyboard. Uses an output stream like PrintWriter connected to getOutputStream() method of Socket.
- Receiving data from the other system. Uses an input stream like BufferedReader connected to getInputStream() method of Socket.
As the responsibilities are same, both client and server programs contain the same stream objects and same code. The order of using stream objects varies in the while loop.
Client program: GossipClient.java
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import java.io.*;
import java.net.*;
public class GossipClient
{
public static void main(String[] args) throws Exception
{
Socket sock = new Socket("127.0.0.1", 3000);
// reading from keyboard (keyRead object)
BufferedReader keyRead = new BufferedReader(new InputStreamReader(System.in));
// sending to client (pwrite object)
OutputStream ostream = sock.getOutputStream();
PrintWriter pwrite = new PrintWriter(ostream, true);
// receiving from server ( receiveRead object)
InputStream istream = sock.getInputStream();
BufferedReader receiveRead = new BufferedReader(new InputStreamReader(istream));
System.out.println("Start the chitchat, type and press Enter key");
String receiveMessage, sendMessage;
while(true)
{
sendMessage = keyRead.readLine(); // keyboard reading
pwrite.println(sendMessage); // sending to server
pwrite.flush(); // flush the data
if((receiveMessage = receiveRead.readLine()) != null) //receive from server
{
System.out.println(receiveMessage); // displaying at DOS prompt
}
}
}
}
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Note: To come out of the chat, type Ctrl+C.
Server program: GossipServer.java
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import java.io.*;
import java.net.*;
public class GossipServer
{
public static void main(String[] args) throws Exception
{
ServerSocket sersock = new ServerSocket(3000);
System.out.println("Server ready for chatting");
Socket sock = sersock.accept( );
// reading from keyboard (keyRead object)
BufferedReader keyRead = new BufferedReader(new InputStreamReader(System.in));
// sending to client (pwrite object)
OutputStream ostream = sock.getOutputStream();
PrintWriter pwrite = new PrintWriter(ostream, true);
// receiving from server ( receiveRead object)
InputStream istream = sock.getInputStream();
BufferedReader receiveRead = new BufferedReader(new InputStreamReader(istream));
String receiveMessage, sendMessage;
while(true)
{
if((receiveMessage = receiveRead.readLine()) != null)
{
System.out.println(receiveMessage);
}
sendMessage = keyRead.readLine();
pwrite.println(sendMessage);
pwrite.flush();
}
}
}
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tcp chat client server program in java
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kutty
February 13, 2018
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