java.net.SocketException in Java with Examples

// Java Program to Illustrate SocketException
// Server Side App

// Importing required classes
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketTimeoutException;

// Main class
public class SimpleServerApp {

    // Main driver method
    public static void main(String[] args)
        throws InterruptedException
    {

        new Thread(new SimpleServer()).start();
    }

    static class SimpleServer implements Runnable {

        // run() method for thread
        @Override public void run()
        {

            ServerSocket serverSocket = null;

            // Try block to check for exceptions
            try {

                serverSocket = new ServerSocket(3333);
                serverSocket.setSoTimeout(0);

                // Till condition holds true
                while (true) {

                    try {
                        Socket clientSocket
                            = serverSocket.accept();

                        // Creating an object of
                        // BufferedReader class
                        BufferedReader inputReader
                            = new BufferedReader(
                                new InputStreamReader(
                                    clientSocket
                                        .getInputStream()));

                        System.out.println(
                            "Client said :"
                            + inputReader.readLine());
                    }

                    // Handling the exception
                    catch (SocketTimeoutException e) {

                        // Print the exception along with
                        // line number
                        e.printStackTrace();
                    }
                }
            }

            // Catch block to handle the exceptions
            catch (IOException e1) {

                // Display the line where exception occurs
                e1.printStackTrace();
            }

            finally {

                try {
                    if (serverSocket != null) {
                        serverSocket.close();
                    }
                }
                catch (IOException e) {

                    e.printStackTrace();
                }
            }
        }
    }
}

// Java Program to Illustrate SocketException
// Client Side App

// Importing required classes
import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.SocketException;
import java.net.UnknownHostException;

// Class 1
// Main class
public class SimpleClientApp {

    // Main driver method
    public static void main(String[] args)
    {

        // Calling inside main()
        new Thread(new SimpleClient()).start();
    }

    // Class 2
    // Helper class
    static class SimpleClient implements Runnable {

        // run() method for the thread
        @Override public void run()
        {

            // Initially assign null to our socket to be
            // used
            Socket socket = null;

            // Try block to e=check for exceptions
            try {

                socket = new Socket("localhost", 3333);

                // Creating an object of PrintWriter class
                PrintWriter outWriter = new PrintWriter(
                    socket.getOutputStream(), true);

                // Display message
                System.out.println("Wait");

                // making thread to sleep for 1500
                // nanoseconds
                Thread.sleep(15000);

                // Display message
                outWriter.println("Hello Mr. Server!");
            }
            // Catch block to handle the exceptions

            // Catch block 1
            catch (SocketException e) {

                // Display the line number where exception
                // occurred using printStackTrace() method
                e.printStackTrace();
            }

            // Catch block 2
            catch (InterruptedException e) {
                e.printStackTrace();
            }

            // Catch block 3
            catch (UnknownHostException e) {
                e.printStackTrace();
            }

            // Catch block 4
            catch (IOException e) {
                e.printStackTrace();
            }

            finally {

                try {

                    // If socket goes NULL
                    if (socket != null)

                        // Close the socket
                        socket.close();
                }
                catch (IOException e) {

                    e.printStackTrace();
                }
            }
        }
    }
}