getInputStream块? [英] getInputStream blocks?
问题描述
使用输入/输出流在客户端和服务器之间传递对象.我可以使用我的服务器发送和接收对象,现在我希望客户端现在只能发送该对象.所以我给我的客户一个ObjectInputStream.但是,当我初始化它时,它会阻塞!一直在搜索并找到答案,但没有解决方案.
Using Input/Output stream to pass objects between my client and server. I can both send and receive objects with my server, and and now i want the same for the client which as of now only can send. So i gave my client an ObjectInputStream. However, when i initilazie it, it blocks! Been searching around and found answers but no solution.
请帮助!
public GameConnection(String strPort, TextArea chat)
{
this.port = Integer.parseInt(strPort);
System.out.println("GameConnection::Constructor(): Connecting on port " + port);
this.chat = chat;
connect = new Connection();
sendObject();
}
public void sendObject()
{
try
{
obj_stream.writeObject(new String("GameServer received a message!"));
}
catch(Exception e){System.out.println("GameConnection::sendObject(): " + e);}
}
protected class Connection extends Thread
{
private boolean alive = true;
public Connection()
{
try
{
socket = new Socket(host, port);
System.out.println("Connected to GAMESERVER" + host + " on port + " + port);
obj_stream = new ObjectOutputStream(socket.getOutputStream());
// Next line BLOCKS!!!
//ObjectInputStream stream = new ObjectInputStream(socket.getInputStream());
}
catch (IOException ioe)
{
System.out.println("Connection::constructor() " + ioe);
Terminate();
}
catch (NullPointerException npe)
{
System.out.println("Connection::constructor() " + npe);;
Terminate();
}
}
我尝试在不同的线程中使用它们,但是它有同样的问题,至少对我来说是这样的:(
I tried using them in different threads but it had the same problem, at least for me :(
推荐答案
是的,这个问题已经被问过很多次了.对象流格式具有标头,并且ObjectInputStream在构造时读取该标头.因此,它将一直阻塞,直到它通过套接字接收到该标头为止.假设您的客户端/服务器代码看起来相似,则在构造ObjectOutputStream之后,刷新它.这将迫使标头数据通过网络.
yes, this question has been asked many times before. the object stream format has a header, and the ObjectInputStream reads that header on construction. therefore, it is blocking until it receives that header over the socket. assuming your client/server code looks similar, after you construct the ObjectOutputStream, flush it. this will force the header data over the wire.
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