A socket connection means the two machines have information about each other’s network location (IP Address) and TCP port. The java.net.Socket class represents a Socket. Here, we are going to look at the approach of connecting to socket 6123.
Approach:
- Create an object of Socket class and pass 6123 as an argument.
- Accept connections with accept() method of ServerSocket class.
- Get the address of the connection with getInetAddress() method of Socket class and getHostAddress() of InetAddress class.
Server Code:
Java
// Make a server to allow the connection to the socket 6123 import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
public class Server {
public static void main(String[] args) { check(); }
private static void check()
{
try {
// Creating object of ServerSocket class
ServerSocket connection
= new ServerSocket( 6123 );
while ( true ) {
System.out.println( "Listening" );
// Creating object of Socket class
Socket socket = connection.accept();
// Creating object of InetAddress class
InetAddress address
= socket.getInetAddress();
System.out.println(
"Connection made to "
+ address.getHostAddress());
pause( 1000 );
// close the socket
socket.close();
}
}
catch (IOException e) {
System.out.println( "Exception detected: " + e);
}
}
private static void pause( int ms)
{
try {
Thread.sleep(ms);
}
catch (InterruptedException e) {
}
}
} |
Output
Client Code:
Java
// A Java program for a Client import java.net.*;
import java.io.*;
public class Client {
// initialize socket and input output streams
private Socket socket = null ;
private DataInputStream input = null ;
private DataOutputStream out = null ;
// constructor to put ip address and port
public Client(String address, int port)
{
// establish a connection
try {
socket = new Socket(address, port);
System.out.println( "Connected" );
// takes input from terminal
input = new DataInputStream(System.in);
// sends output to the socket
out = new DataOutputStream(
socket.getOutputStream());
}
catch (UnknownHostException u) {
System.out.println(u);
}
catch (IOException i) {
System.out.println(i);
}
// string to read message from input
String line = "" ;
// keep reading until "Over" is input
while (!line.equals( "Over" )) {
try {
line = input.readLine();
out.writeUTF(line);
}
catch (IOException i) {
System.out.println(i);
}
}
// close the connection
try {
input.close();
out.close();
socket.close();
}
catch (IOException i) {
System.out.println(i);
}
}
public static void main(String args[])
{
Client client = new Client( "127.0.0.1" , 6123 );
}
} |
Output
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