Question

所以基本上我正在编写一个客户端 - 服务器多人游戏。我有一个SeverCommunicationThread，如果他收到RequestForGame就会创建一个gameThread来创建gameThread。当我发送一个RequestForGame异常时抛出java.io.StreamCorruptedException：无效的类型代码：00 我认为这是因为两个线程都试图读取相同的ObjectInputStream，我对它的工作原理并不太了解，我只知道如何使用它。你能帮我理解问题是什么以及如何解决？谢谢:)）

public class ServerCommunicationThread extends Thread{
private Socket connectionSocket;
private ObjectInputStream inFromClient;
private ObjectOutputStream outToClient;
private String nickname;
private ServerModelManager model;


public ServerCommunicationThread(Socket connectionSocket,
        ServerModelManager model) throws IOException {
    this.connectionSocket = connectionSocket;
    inFromClient = new ObjectInputStream(connectionSocket.getInputStream());
    outToClient = new ObjectOutputStream(connectionSocket.getOutputStream());
    this.model = model;
    start();

}

public void run() {
    try {
        String nickname = (String) inFromClient.readObject();
        if (model.exists(nickname)){
            System.out.println(nickname + " already exists");
            outToClient.writeObject(new MessageForClient("Please choose another nickname"));
        }
        else
        {
            System.out.println(nickname + " connected, adding to list");
            model.addClient(nickname, connectionSocket,outToClient,inFromClient);
            this.nickname=nickname;
        }
        while(true){
            Object o= inFromClient.readObject();//StreamCorruptedexception
            if(o instanceof RequestForGame)
            {
                RequestForGame r=(RequestForGame)o;
                String userToPlayWith=r.getUserToPlayWith();
                if(userToPlayWith.equals(nickname))
                {
                    String message="Playing with yourself makes your palms hairy, choose another opponent";
                    outToClient.writeObject(message);
                }
                else
                {
                System.out.println("received request to play with "+userToPlayWith+". starting game");
                ClientRepresentative client1=model.getClient(nickname);
                ClientRepresentative client2=model.getClient(userToPlayWith);
                ServerGameThread s=new ServerGameThread(client2,client1,client2.getInStream(),client1.getInStream(),client1.getOutStream(),client2.getOutStream());
                }
            }
            else if(o instanceof String)
            {
                String s=(String) o;
                if(s.equals("i want to quit"))
                {
                    model.deleteClient(nickname);
                    inFromClient.close();
                    String q="quit";
                    outToClient.writeObject(q);
                    connectionSocket.close();
                    System.out.println(nickname+"has quit without exc");
                }
            }
        }
    } catch (EOFException e) {
        System.out.println(nickname+" has quit");
    }
    catch (SocketException e)
    {
        System.out.println(nickname+" has quit");
    }

    catch (Exception e) {

        e.printStackTrace();
    }
}

}
 public class ServerGameThread extends Thread {

private ClientRepresentative client1,client2;
private ObjectInputStream inFromClient1,inFromClient2;
private ObjectOutputStream outToClient1,outToClient2;
private Field gameField; 
public ServerGameThread(ClientRepresentative client1, ClientRepresentative client2,ObjectInputStream inFromClient1,ObjectInputStream inFromClient2,ObjectOutputStream outToClient1,ObjectOutputStream outToClient2)
{
    System.out.println("startin game thred");
    this.client1=client1;//client 1 goes first
    this.client2=client2;//client 2 started game


        this.inFromClient1=inFromClient1;
        this.inFromClient2=inFromClient2;
        this.outToClient1=outToClient1;
        this.outToClient2=outToClient2;


        gameField=new Field();
        System.out.println("check");
        start();
}
public void run()
{
    System.out.println("Starting game. players: "+client1.getNickname()+";"+client2.getNickname());
    try {
        outToClient1.writeObject(gameField);
        outToClient2.writeObject(gameField);
        while(true)
        {
            try {
                System.out.println("listening to "+client1.getNickname());
                Object o1=inFromClient1.readObject();//read move from client 1.**//StreamCorruptedexception**

                while(!(o1 instanceof PlayerMove))
                {
                    o1=inFromClient1.readObject();//read move from client 1.
                }
                PlayerMove move1=(PlayerMove)o1;
                System.out.println("received move "+move1+" sending to "+client2.getNickname());
                outToClient2.writeObject(move1);
                System.out.println("listening to "+client2.getNickname());
                Object o2=inFromClient2.readObject();//read move from client 1.
                while(!(o2 instanceof PlayerMove))
                {   
                    o2=inFromClient2.readObject();//read move from client 1.
                }
                PlayerMove move2=(PlayerMove)o2;
                System.out.println("received move "+move2+" sending to "+client1.getNickname());
                outToClient1.writeObject(move2);
            }
                catch (ClassNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}
}

model.addClient方法虽然我认为问题不在这里

  public void addClient(String nickname, Socket       clientSocket,ObjectOutputStream stream,ObjectInputStream inStream)
{
    clients.addClient(nickname, clientSocket,stream,inStream);//add to arraylist
//send client list to all clients
    String[] users=this.getAvailableClients();
    ObjectOutputStream[] streams=clients.getOutStreams();
    for(int i=0;i<streams.length;i++)
    {
        try {
            streams[i].writeObject(users);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

将对象发送到服务器的客户端代理，这些方法由GUI中的用户操作触发

  public class Proxy {
final int PORT = 1337;
String host;
String nickname;
private Socket clientSocket;
private ObjectOutputStream outToServer;
private ObjectInputStream inFromServer;
private ClientModelManager manager;
public Proxy(String nickname,String host,ClientModelManager manager)
{
    this.nickname=nickname;
    this.host=host;
    this.manager=manager;
    this.connect(nickname);
}
public void connect(String nick)
{
    Socket clientSocket;
    try {
        clientSocket = new Socket(host, PORT);
        System.out.println("client socket created");
        outToServer = new ObjectOutputStream(clientSocket.getOutputStream());
        inFromServer=new ObjectInputStream(clientSocket.getInputStream());
        outToServer.flush();
        outToServer.writeObject(nick);
        ClientReceiverThread t=new ClientReceiverThread(inFromServer,manager);
        t.start();
    } catch (Exception e) {
        e.printStackTrace();
    } 
}
public void makeRequest(String user)
{
    try
    {
    outToServer.writeObject(new RequestForGame(user));
    }
    catch(IOException e)
    {
        e.printStackTrace();
    }
}
public void quit()
{
    try {
        outToServer.writeObject(new String("i want to quit"));
        //clientSocket.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}
public void sendMove(PlayerMove move)
{
    try {
        outToServer.writeObject(move);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

}

Answer 1

如果您

，可能会发生此问题

在同一个套接字上构造一个新的ObjectInputStream或ObjectOutputStream，而不是在套接字的生命周期中使用相同的套接字;
在同一个套接字上使用另一种流;或者，
使用对象流来读取或写入不是对象的内容并且您不同步。

Answer 2

如果读取序列化对象的JVM没有对象的正确类/ jar文件，也会发生这种情况。这通常会产生ClassNotFoundException，但如果您有不同的jar / class版本且版本之间的serialVersionUID没有更改，则会生成StreamCorruptedException。（如果存在类名冲突，也可能出现此异常。例如：包含具有相同完整类名的不同类的jar，尽管它们可能也需要相同的serilVersionUID）。

检查客户端是否具有正确版本的jar和类文件。

Answer 3

如果您通过添加此方法为类实现自定义反序列化例程，我还会遇到另一种可能性：

private void readObject( ObjectInputStream objectInputStream ) throws IOException

然后必须在进一步读取输入流之前调用并调用objectInputStream.defaultReadObject（）以正确初始化对象。

我错过了这个，尽管返回的对象没有抛出异常，但是下一次读取的对象流容易引起无效的类型代码异常。

此链接提供有关流程的更多信息：http://osdir.com/ml/java.sun.jini/2003-10/msg00204.html。

Answer 4

如果ObjectInputStream只构造一次，然后只是将它的引用传递给另一个Thread，那么只需将该对象的访问权限放在synchronized块中，以确保只有一个线程可以访问它一次一个对象。

每当您从ObjectInputStream阅读时，只需在synchronized块内访问它，如果它在多个线程之间共享。

示例代码:(为所有readObject()}

出现

...
String nickname = null;
synchronized (inFromClient) {
    nickname = (String) inFromClient.readObject();
}

Answer 5

我也有这个例外。之所以发生这种情况是因为我为Server类和Client类使用了两个线程。我用一个线程来发送和接收对象。那没关系。如果您不熟悉synchronized，这是解决问题的简便方法。

Answer 6

java.io.StreamCorruptedException：类型代码无效：00

我最近遇到了这个问题，但没有做OP所做的事情。快速谷歌搜索并没有找到任何有用的东西，因为我认为我解决了它，我正在用我的解决方案发表评论。

TLDR：不要让多个线程同时写入同一输出流（而是轮流）。当客户端尝试读取数据时会导致问题。解决方案是锁定写入输出。

我正在做一些与OP非常相似的事情，制作一个多人游戏（客户端 - 服务器模型）游戏。我有一个类似OP的线程正在监听流量。在我的服务器端发生的事情是，服务器有多个线程同时写入客户端的流（没有想到它是可能的，游戏是半转基础）。正在读取传入流量的客户端线程正在抛出此异常。为了解决这个问题，我基本上锁定了写入客户端流的部分（在服务器端），因此服务器端的每个线程都必须在写入流之前获取锁。

java.io.StreamCorruptedException：类型代码无效：00

6 个答案: