Writing Socket Program in Java

Let us consider a client and ServerSocket, so that we can create a sender and listener. Here is the client code:


import java.net.*;
import java.io.*;

public class Client {

public static void main(String[] args) throws IOException{

Socket cls=null;
BufferedReader br=null;
try{
cls= new Socket(InetAddress.getLocalHost(),195);
br = new BufferedReader(new InputStreamReader(cls.getInputStream()));
}
catch (UnknownHostException uh){
System.out.println("host unknown");
System.exit(0);
}
String inp,si;
while((inp=br.readLine())!=null)
{
System.out.println(inp);
}
br.close();
cls.close();
}
}

and this is how you can write a server socket

import java.net.*;

import java.io.*;

public class Servsoc {

public static void main (String args[]) throws IOException{

ServerSocket ss=null;

try{

ss = new ServerSocket(195);

}

catch (IOException ioe)

{

System.out.println("error in finding port 95");

System.exit(1);

}

Socket soc = null;

soc = ss.accept();

System.out.println("connection accepted at : " + soc);

DataOutputStream out = new DataOutputStream(soc.getOutputStream());

String si, clstr;

BufferedReader kybd = new BufferedReader (new InputStreamReader(System.in));

System.out.println("Ready to send message, type exit to end session");

while(!(si =kybd.readLine()).equals("exit")){

int ln = si.length();

for (int i=0; i<ln;i++){

out.write(13);

out.write(10);

out.write(12);

out.flush();

}

out.close();

kybd.close();

ss.close();

}

}

}

Run Server first and then Client and see that the message you typed is getting transferred.