服务器与多个客户端（Java） - 发送字符串

我正在写一个程序，基本上是涉及一个服务器，处理游戏逻辑和多个客户端（最多四个），基本上是球员的纸牌游戏。客户端使用JFrame制作的所有GUI。无论如何，一部分涉及按下其中一个JFrame上的按钮。这应该向服务器发送一个字符串，并且服务器应该向所有客户端返回一个新字符串。但是，我的代码不起作用。这里简要介绍一下我到目前为止有：服务器与多个客户端（Java） - 发送字符串

服务器代码：

public class Server { 

    ServerSocket ss = null; 
    ArrayList<Game> 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<Player>(); 
     cPlayers = new ArrayList<Player>(); 
     clients = new ArrayList<Game>(); 

     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(); 
       } 
      } 
     } 
    } 
}

这里是服务器中的paintGame（）。它创建一些字符串，然后把这些给客户端：

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 < clients.size(); i++){ 
     try{ 
      clients.get(i).out.println(tCards); 
      clients.get(i).out.flush(); 
     } 

      catch (Exception e){}    
    } 
}

最后这里是客户端应该发出和读取琴弦的部分：

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 < c.length; i++) { 
      System.out.println(c[i]); 
      cPaint.add(c[i]); 
     } 
     System.out.println("Strings separated!"); 
    } else { 
     System.out.println("ERROR! Null string"); 
    } 

}

我大多不知道关于最后一部分。我实际上不知道其他客户端如何获取发送和读取的字符串，因为没有客户端持续发送/读取字符串（如果按下按钮，它们只发送字符串）。

编辑：抱歉关于奇怪的格式._。

来源

2012-10-16 user1748578