Deadly Dungeon Java Snippet

Client.java

/*
 * Copyright (c) 2017, Just AS. All rights reserved.
 */

package com.gojust.deadlydungeon.client;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class Client {
    private static String url = "http://deadly-dungeon.gojust.eu";

    public static class InvalidDirectionException extends Exception {
        private static final long serialVersionUID = -2071306614069491368L;

        public InvalidDirectionException(final String message) {
            super(message);
        }
    }

    public static void main(final String[] args) {
        try {
            System.out.println(Client.getMap());
            System.out.println("---");
            System.out.println(Client.walk('S'));
        } catch (final Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public static String getMap() throws IOException {
        final URL url = new URL(Client.url);

        final HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setRequestMethod("GET");
        con.setRequestProperty("Accept", "text/plain");

        try {
            return Client.getMapFromConnection(con);
        } finally {
            con.disconnect();
        }
    }

    public static String walk(final char direction) throws IOException, InvalidDirectionException {
        final URL url = new URL(Client.url);

        final HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setRequestMethod("POST");
        con.setRequestProperty("Accept", "text/plain");
        con.setDoOutput(true);

        try (DataOutputStream wr = new DataOutputStream(con.getOutputStream())) {
            wr.write(direction);
        }

        try {
            if (con.getResponseCode() == 400) {
                throw new InvalidDirectionException("Invalid direction");
            }
            return Client.getMapFromConnection(con);
        } finally {
            con.disconnect();
        }
    }

    private static String getMapFromConnection(final HttpURLConnection con) throws IOException {
        final BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String inputLine;
        final StringBuffer content = new StringBuffer();
        while ((inputLine = in.readLine()) != null) {
            content.append(inputLine + "\n");
        }
        in.close();
        return content.toString();
    }
}