NAD Chapter 8 - 1 & 2 solutions

ClientApp.java

package app;

import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.util.Scanner;

public class ClientApp {
    public static void main(String[] args) throws Exception {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter your name: ");
        String name = in.nextLine();
        System.out.print("Enter your age: ");
        int age = in.nextInt();
        System.out.print("Enter your message: ");
        String message = in.next();
        User user = new User(name, age, message);
        System.out.println("User info: " + user);
        Socket serverSocket = new Socket("127.0.0.1", 50000);
        ObjectOutputStream oos = new ObjectOutputStream(serverSocket.getOutputStream());
        ObjectInputStream ois = new ObjectInputStream(serverSocket.getInputStream());
        oos.writeObject(user);
        User recieved = (User)ois.readObject();
        System.out.println("Recieved from server: " + recieved);
        serverSocket.close();
        in.close();
    }
}

ServerApp.java

package app;

import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class ServerApp {
    public static void main(String[] args) throws Exception {
        ServerSocket serverSocket = new ServerSocket(50000);
        Socket clientSocket = serverSocket.accept();
        System.out.println("Client " + clientSocket.getInetAddress().getHostAddress() + ":" + clientSocket.getPort() + " has connected");
        ObjectOutputStream oos = new ObjectOutputStream(clientSocket.getOutputStream());
        ObjectInputStream ois = new ObjectInputStream(clientSocket.getInputStream());
        User recieved = (User)ois.readObject();
        System.out.println("Recieved from client: " + recieved);
        oos.writeObject(recieved);
        serverSocket.close();
    }
}

User.java

package app;

import java.io.Serializable;

public class User implements Serializable {
    private String name;
    private int age;
    private String message;


    public User() {
    }

    public User(String name, int age, String message) {
        this.name = name;
        this.age = age;
        this.message = message;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return this.age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getMessage() {
        return this.message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    @Override
    public String toString() {
        return "{" +
            " name='" + getName() + "'" +
            ", age='" + getAge() + "'" +
            ", message='" + getMessage() + "'" +
            "}";
    }

}