Example of sending a String through a Socket in Java.

SendStringOverSocket.java

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;

public class Client {
    public static void main(String[] args) throws IOException {
        // need host and port, we want to connect to the ServerSocket at port 7777
        Socket socket = new Socket("localhost", 7777);
        System.out.println("Connected!");

        // get the output stream from the socket.
        OutputStream outputStream = socket.getOutputStream();
        // create a data output stream from the output stream so we can send data through it
        DataOutputStream dataOutputStream = new DataOutputStream(outputStream);

        System.out.println("Sending string to the ServerSocket");

        // write the message we want to send
        dataOutputStream.writeUTF("Hello from the other side!");
        dataOutputStream.flush(); // send the message
        dataOutputStream.close(); // close the output stream when we're done.

        System.out.println("Closing socket and terminating program.");
        socket.close();
    }
}


import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    public static void main(String[] args) throws IOException {
        // don't need to specify a hostname, it will be the current machine
        ServerSocket ss = new ServerSocket(7777);
        System.out.println("ServerSocket awaiting connections...");
        Socket socket = ss.accept(); // blocking call, this will wait until a connection is attempted on this port.
        System.out.println("Connection from " + socket + "!");

        // get the input stream from the connected socket
        InputStream inputStream = socket.getInputStream();
        // create a DataInputStream so we can read data from it.
        DataInputStream dataInputStream = new DataInputStream(inputStream);

        // read the message from the socket
        String message = dataInputStream.readUTF();
        System.out.println("The message sent from the socket was: " + message);

        System.out.println("Closing sockets.");
        ss.close();
        socket.close();
    }
}

//Server Output
/*
ServerSocket awaiting connections...
Connection from Socket[addr=/127.0.0.1,port=62085,localport=7777]!
The message sent from the socket was: Hello from the other side!
Closing sockets.
*/

// Client Output
/*
Connected!
Sending string to the ServerSocket
Closing socket and terminating program.
*/

thnk you!

If you only knew how helpful this was to me... thank you!

line 51 was not printed in Server output

how do you code the exception handlers?

Love you a lot!!!!!!!!!!!!!

Thank you for this helpful example!

This is beautiful

very nice!

Awesome. Thx a lot.

Multiple hours and dozens of pages leading to nothing were all erased with this one example, thank you!