I've got a client/server protocol running through TCP/IP. Without the code:
String fileName = "output.txt";
final boolean append = true, autoflush = true;
PrintStream printStream = new PrintStream(new FileOutputStream(fileName,append));
...
...
System.setOut(printStream);
I can get the output I want in the server terminal. However, when I add the code (from above) only the part of the terminal displays the output, and the rest gets saved in the text file. I'm glad it saves in the text file, but I want it to output to the terminal as well for demonstration purposes.
What can I do to alter the code to achieve getting it to output onto the terminal, but also save the terminal in the output.txt file?
Below are the server and client code if you'd like to test it.
Server.java
package TCPSocket;
import java.io.*;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
public class TCPServer{
private ServerSocket server;
/**
* The TCPServer constructor initiate the socket
* @param ipAddress
* @param port
* @throws Exception
*/
public TCPServer(String ipAddress, int port) throws Exception {
if (ipAddress != null && !ipAddress.isEmpty())
this.server = new ServerSocket(port, 1, InetAddress.getByName(ipAddress));
else
this.server = new ServerSocket(0, 1, InetAddress.getLocalHost());
}
/**
* The listen method listen to incoming client's datagrams and requests
* @throws Exception
*/
private void listen() throws Exception {
// listen to incoming client's requests via the ServerSocket
//add your code here
String data = null;
Socket client = this.server.accept();
String clientAddress = client.getInetAddress().getHostAddress();
System.out.println("\r\nNew client connection from " + clientAddress);
String serverIP = "192.168.56.1"; // local IP address
int port = 7077;
String fileName = "output.txt";
final boolean append = true, autoflush = true;
PrintStream printStream = new PrintStream(new FileOutputStream(fileName,append));
// print received datagrams from client
BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
while ( (data = in.readLine()) != null && !data.equals("QUIT")) {
try {
if (data.startsWith("HELLO")) {
System.out.println("\r\nC: " + data);
System.out.println("\r\nS: 250 " + data.toLowerCase() + ", pleased to meet you");
} else if (data.startsWith("MAIL FROM: ")) {
System.out.println("\r\nC: " + data);
System.out.println("\r\nS: 250 ok");
} else if (data.startsWith("RCPT TO: ")) {
System.out.println("\r\nC: " + data);
System.out.println("\r\nS: 250 ok");
} else if (data.equals("DATA")) {
System.out.println("\r\nC: " + data);
System.out.println("\r\nS: 354 End data with <CR><LF>.<CR><LF>");
} else if (data.equals(".")) {
System.out.println("\r\nC: " + data);
System.out.println("\r\nS: 250 ok Message accepted for delivery");
} else
System.out.println("\r\nC: " + data);
client.sendUrgentData(1);
System.setOut(printStream);
} catch (IOException e) {
System.out.println(e);
}
}
System.out.println("\r\nC: " + data);
System.out.println("\r\nS: 221 " + serverIP + " closing connection");
}
public InetAddress getSocketAddress() {
return this.server.getInetAddress();
}
public int getPort() {
return this.server.getLocalPort();
}
public static void main(String[] args) throws Exception {
// set the server address (IP) and port number
//add your code here
String serverIP = "192.168.56.1"; // local IP address
int port = 7077;
if (args.length > 0) {
serverIP = args[0];
port = Integer.parseInt(args[1]);
}
// call the constructor and pass the IP and port
//add your code here
TCPServer server = new TCPServer(serverIP, port);
System.out.println("\r\nRunning Server: " +
"Host=" + server.getSocketAddress().getHostAddress() +
" Port=" + server.getPort());
System.out.println("220 gov.uk");
server.listen();
}
}
Client.java
package TCPSocket;
import java.io.*;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.Socket;
import java.util.Scanner;
public class TCPClient{
private Socket tcpSocket;
private InetAddress serverAddress;
private int serverPort;
private Scanner scanner;
/**
* @param serverAddress
* @param serverPort
* @throws Exception
*/
private TCPClient(InetAddress serverAddress, int serverPort) throws Exception {
this.serverAddress = serverAddress;
this.serverPort = serverPort;
//Initiate the connection with the server using Socket.
//For this, creates a stream socket and connects it to the specified port number at the specified IP address.
//add your code here
this.tcpSocket = new Socket(this.serverAddress, this.serverPort);
this.scanner = new Scanner(System.in);
}
/**
* The start method connect to the server and datagrams
* @throws IOException
*/
private void start() throws IOException {
String input;
//create a new PrintWriter from an existing OutputStream (i.e., tcpSocket).
//This convenience constructor creates the necessary intermediateOutputStreamWriter, which will convert characters into bytes using the default character encoding
while (true) {
input = scanner.nextLine();
PrintWriter output = new PrintWriter(this.tcpSocket.getOutputStream(), true);
output.println(input);
output.flush();
try{
if(input.equals("QUIT")){
tcpSocket.close();
break;
}
}catch (IOException e) {
System.out.println(e);
}
}
}
public static void main(String[] args) throws Exception {
// set the server address (IP) and port number
//add your code here
InetAddress serverIP = InetAddress.getByName("192.168.56.1"); // local IP address
int port = 7077;
if (args.length > 0) {
serverIP = InetAddress.getByName(args[0]);
port = Integer.parseInt(args[1]);
}
// call the constructor and pass the IP and port
//add your code here
TCPClient client = new TCPClient(serverIP, port);
System.out.println("\r\n Connected to Server: " + client.tcpSocket.getInetAddress());
client.start();
}
}
