/*

ROT-1 server.

Java version of:

https://github.com/cirosantilli/cpp-cheat/tree/f31150c42331407fd434a7e912ca64642710fea2/posix/socket/inet

*/

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintStream;

import java.net.ServerSocket;

import java.net.Socket;

public class ServerSocketCheat {

public static void main(String[] args) throws IOException {

final int port = 12345;

ServerSocket listener = new ServerSocket(port);

System.out.printf("listening on port %d%n", port);

while (true) {

System.out.println("waiting for client");

Socket socket = listener.accept();

System.out.printf("client connected from: %s%n", socket.getRemoteSocketAddress().toString());

BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

PrintStream out = new PrintStream(socket.getOutputStream());

for (String inputLine; (inputLine = in.readLine()) != null;) {

System.out.println("received:");

System.out.println(inputLine);

StringBuilder outputStringBuilder = new StringBuilder("");

char inputLineChars[] = inputLine.toCharArray();

for (char c : inputLineChars)

outputStringBuilder.append(Character.toChars(c + 1));

out.println(outputStringBuilder);

}

socket.close();

}

// Unreachable: user must Ctrl + C to exit.

//listener.close();

}

}