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POServer with Multiple Clients (Java) - sending strings
 

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    <p>I'm writing a program that's basically a card game involving a server that handles the game logic and multiple clients (up to four) that are essentially the players. The clients all of GUIs made using JFrame. Anyway, one part involves pressing a button on one of the JFrames. This should send a string to the server, and the server should return a new string to ALL the clients. However, my code is not working. Here's a brief overview what I have so far:</p> <p>SERVER CODE:</p> <pre><code>public class Server { ServerSocket ss = null; ArrayList&lt;Game&gt; clients; //'Game' is essentially my Handle A Client class //bunch of other variables that store things like players, etc public Server() { try { ss = new ServerSocket(7777); } catch (Exception e) { e.printStackTrace(); System.exit(0); } idGen = 0; numPs = 0; tPlayers = new ArrayList&lt;Player&gt;(); cPlayers = new ArrayList&lt;Player&gt;(); clients = new ArrayList&lt;Game&gt;(); while (true) { try { Socket s = ss.accept(); Game g = new Game(s, this, idGen); clients.add(g); Thread thr = new Thread(g); thr.start(); idGen++; } catch (Exception e) { System.out.println("got an exception" + e.getMessage()); } System.out.println("got a connection"); try { Player obj = null; FileInputStream fis = new FileInputStream("User_Database.sav"); //serializes the player object and reads from file ObjectInputStream oi = new ObjectInputStream(fis); while ((obj = (Player) oi.readObject()) != null) { tPlayers.add(obj); } oi.close(); } catch (IOException ie) { } catch (ClassNotFoundException e) { System.out.println("Class not found exception."); } } } public class Game implements Runnable { int id; Socket mySocket; Server serv; PrintWriter out; BufferedReader in; public Game(Socket s, Server ser, int i) { mySocket = s; id = i; serv = ser; try { out = new PrintWriter(mySocket.getOutputStream(), true); in = new BufferedReader(new InputStreamReader(mySocket.getInputStream())); } catch (Exception e) { e.printStackTrace(); System.exit(0); } } public void run() { while (true) { try { String msg = in.readLine(); if (msg == "p") { serv.paintGame(); //this is the thing that should send out multiple strings } else { //does some other stuff } } catch (Exception e) { e.printStackTrace(); } } } } } </code></pre> <p>And here is the paintGame() within server. It creates some strings and then sends those to the client:</p> <pre><code>public void paintGame(){ String tCards = ""; System.out.println("Adding words to strings"); if(numPs == 2){ tCards = "" + h1.get(0).gif + "_" + h2.get(0).gif + ""; } else if(numPs == 3){ tCards = "" + h1.get(0).gif + "_" + h2.get(0).gif + "_" + h3.get(0).gif + ""; } else if(numPs == 4){ tCards = "" + h1.get(0).gif + "_" + h2.get(0).gif + "_" + h3.get(0).gif + "_" + h4.get(0).gif + ""; } System.out.println("Finished adding"); for(int i = 0; i &lt; clients.size(); i++){ try{ clients.get(i).out.println(tCards); clients.get(i).out.flush(); } catch (Exception e){} } } </code></pre> <p>And finally here is the part of the client that should send out and read the strings:</p> <pre><code> public void paintGame() { String s = "p"; String[] c; String d = "_"; try { out5 = new PrintWriter(socket.getOutputStream(), true); in5 = new BufferedReader(new InputStreamReader(socket.getInputStream())); out5.println(s); } catch (IOException e) { e.printStackTrace(); } while (s != null) { try { System.out.println(s); s = in5.readLine(); } catch (Exception e) { e.printStackTrace(); } } System.out.println("Separating string!"); if (s != null) { c = s.split(d); for (int i = 0; i &lt; c.length; i++) { System.out.println(c[i]); cPaint.add(c[i]); } System.out.println("Strings separated!"); } else { System.out.println("ERROR! Null string"); } } </code></pre> <p>I'm mostly not sure about that last part. I actually have no idea how the other clients are going to get the strings that are sent and read them, since none of the clients are continuously sending/reading strings (they only send strings if a button is pressed).</p> <p>EDIT: Sorry about the weird formatting ._.</p>
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