当我想使用套接字发送对象时出现Java异常

我想做一个服务器-客户机应用程序，服务器将在其中等待对象，当服务器得到对象时，然后用它做一些事情。但当服务器想要获取对象时，我遇到了问题

服务器：

public static void main(String[] argv) throws IOException {
    String command;
    List<Game> games = new ArrayList<>();
    List<Player> players = new ArrayList<>();

    serverSocket = new ServerSocket(9999);

    while(true){
        System.out.println("Waiting for player");
        Socket socket = serverSocket.accept();
        System.out.println("Player connected, waiting for command");

        ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
        System.out.println("Output created");

        Player p = new Player(out);
        players.add(p);
        ObjectInputStream in = new ObjectInputStream(socket.getInputStream());
        System.out.println("input created");
        ServerReceiver receiver = new ServerReceiver(games, players, in);
        receiver.start();

    }
}

public class ServerReceiver extends Thread{

private List<Game> games;
private List<Player> players;
private ObjectInputStream in;

public ServerReceiver(List<Game> games, List<Player> players, ObjectInputStream in) throws IOException{
    this.games = games;
    this.players = players;
    this.in = in;
}

@Override
public void run(){
    CommandMessage message = null;
    System.out.println("in thread");
    while(true){
        try {
            message = (CommandMessage) in.readObject();

        } catch (IOException ex) {
            Logger.getLogger(ServerReceiver.class.getName()).log(Level.SEVERE, null, ex);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(ServerReceiver.class.getName()).log(Level.SEVERE, null, ex);
        }

    }
}

和服务器输出：

Waiting for player
Player connected, waiting for command
Output created
input created
Waiting for player
in thread
III 16, 2014 12:24:20 DOP. Comunication.ServerReceiver run
SEVERE: null
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException:   Comunication.CommandMessage
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1354)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at Comunication.ServerReceiver.run(ServerReceiver.java:40)
Caused by: java.io.NotSerializableException: Comunication.CommandMessage
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
at Client.main(Client.java:37)

客户端输出：

Connected
0
Exception in thread "main" java.io.NotSerializableException: Comunication.CommandMessage
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
at Client.main(Client.java:37)
Java Result: 1

---

我能做错什么？或者，如果我的想法不好，有人能告诉我如何做得更好吗？

错误信息非常清楚。CommandMessage类未实现可序列化。修复此问题。

您在循环中读取一个对象，但当客户端断开连接时，您必须以某种方式处理异常，并且不从ObjectInputStream读取要序列化的其他对象，通过网络发送时所做的操作必须实现可序列化：

错误消息表示您尝试发送的对象不可序列化，因此您可以添加

CommandMessage

的代码，因为这是您似乎要发送的类吗？第一个问题：

是否实现了Serializable

？我添加了Serializable，客户端错误消失，但仍然存在服务器错误，所以现在对服务器执行相同的操作我添加Serializable，但仍然存在此异常：

严重：java.io.ObjectInputStream$BlockDataInputStream.peekByte处的null java.io.EOFEException（ObjectInputStream.java:2598）在java.io.ObjectInputStream.readObject0（ObjectInputStream.java:1318）在com.ServerReceiver.run（ServerReceiver.java:40）的java.io.ObjectInputStream.readObject（ObjectInputStream.java:370）上

这是一个新问题，但它只是意味着您试图在读取循环中读取流的末尾。捕获EOFEException并在获得它时关闭和中断。这并没有回答所问的问题。它回答了在对我的答案的评论中提出的一个问题，我在13小时前已经回答了这个问题。

Connected
0
Exception in thread "main" java.io.NotSerializableException: Comunication.CommandMessage
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
at Client.main(Client.java:37)
Java Result: 1