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 创建一个游戏线程,它就会创建一个游戏线程。 当我发送 RequestForGame 异常时抛出 java.io.StreamCorruptedException: invalid type code: 00 我认为这是因为两个线程都尝试读取相同的 ObjectInputStream,我对它的工作原理不太了解,我只知道如何使用它。您能帮我了解问题所在以及如何解决吗? 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 方法虽然我不认为问题出在这里
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,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();
}
}
}
如果您在同一个套接字上构建新的
ObjectInputStream
或 ObjectOutputStream
,而不是在套接字的生命周期内使用相同的,则可能会发生此问题;如果您还在同一套接字上使用另一种流;或者,如果您使用对象流来读取或写入非对象的内容,那么您就会失去同步。
如果读取序列化对象的 JVM 没有该对象的正确类/jar 文件,也可能会发生这种情况。这通常会产生
ClassNotFoundException
,但如果您有不同的 jar/类版本,并且 serialVersionUID
在版本之间没有更改,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
)。
检查客户端是否有正确版本的 jar 和类文件。
如果通过添加此方法为类实现自定义反序列化例程,我遇到了另一种可能性:
private void readObject( ObjectInputStream objectInputStream ) throws IOException
然后必须调用 objectInputStream.defaultReadObject() ,并在进一步读取输入流之前调用以正确初始化对象。
我错过了这一点,尽管对象返回时没有抛出异常,但下一次读取对象流却令人困惑地引发了无效类型代码异常。
此链接提供有关该过程的更多信息:http://osdir.com/ml/java.sun.jini/2003-10/msg00204.html.
我也有这个例外。发生这种情况是因为我对服务器类和客户端类使用了两个线程。我使用一个线程来发送和接收对象。然后就没事了。如果您不熟悉
synchronized
,这是解决问题的简单方法。
如果
ObjectInputStream
仅构造一次,然后将其引用传递给另一个线程,则只需将此对象的访问包含在 synchronized
块中,以确保一次只有一个线程可以访问该对象。
每当您从
ObjectInputStream
读取数据时,如果它在多个线程之间共享,只需在 synchronized
块内访问它。
示例代码:(对所有出现的
readObject()
执行此操作)
...
String nickname = null;
synchronized (inFromClient) {
nickname = (String) inFromClient.readObject();
}
java.io.StreamCorruptedException:无效类型代码:00
我最近遇到了这个问题,但没有做OP所做的事情。进行了快速的谷歌搜索,没有找到任何太有帮助的东西,因为我认为我解决了它,所以我正在对我的解决方案发表评论。
TLDR:不要让多个线程同时写入同一个输出流(而是轮流)。当客户端尝试读取数据时会导致问题。解决方案是锁定输出写入。
我正在做一些与OP非常相似的事情,制作多人(客户端-服务器模型)游戏。我有一个像 OP 这样的线程正在监听流量。在我的服务器端发生的情况是,服务器有多个线程同时写入客户端的流(认为这是不可能的,游戏是半回合制的)。读取传入流量的客户端线程抛出此异常。为了解决这个问题,我基本上在写入客户端流(在服务器端)的部分上加了一个锁,因此服务器端的每个线程都必须在写入流之前获得锁。
我的问题是 gradle JVM 配置不正确。请检查设置中是否使用了兼容的JDK
1. File | Setting | Build, Execution, Deployment | Build Tools | Gradle | Gradle JVM (Here is my problem)
2. Please select the correct your own JDK directory installation in the local computer (default dir in windows is located at the path "C:\Program Files\Java\jdk-17")
希望对大家有帮助