Read and write directly to a socket from terminal.

Main.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;

public class Main {
    
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("ip:");
        final String host = scanner.nextLine();
        System.out.print("port:");
        final int port = Integer.parseInt(scanner.nextLine());
        try {
            final Socket socket = new Socket(host, port);
            System.out.println("Established connection with " + host + ":" + port + "...");
            
            Thread read = new Thread(new Runnable() {public void run() {
                BufferedReader br = null;
                try {
                    br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                } catch (IOException e2) {
                    try {
                        socket.close();
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }
                    scanner.close();
                    System.err.println("[Error] Failed to open input stream.");
                    System.exit(1);
                }
                String str = "";
                try {
                    while ((str = br.readLine()) != null) {
                        System.out.println(str);
                    }
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
                
                try {
                    br.close();
                } catch (IOException e) {
                    System.err.println("[Error] Socket closed.");
                    System.exit(1);
                }
            }});
            
            Thread write = new Thread(new Runnable() {public void run() {
                PrintWriter writer = null;
                try {
                    writer = new PrintWriter(socket.getOutputStream(), true);
                } catch (IOException e) {
                    try {
                        socket.close();
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }
                    scanner.close();
                    System.err.println("[Error] Failed to open output stream.");
                    System.exit(1);
                }
                
                while(true) {
                    writer.println(scanner.nextLine());
                    System.out.println("[Sent!]");
                }
            }});
            
            read.start();
            write.start();
        } catch(Exception e) {
            System.err.println("[Error] Unable to establish connection.");
            System.exit(1);
        }
    }
    
}