[英]JAVA what causes end of stream on network sockets?
据我了解end of stream
的全部end of stream
是告诉输入流何时停止读取数据,这在文件流中是有意义的,但是当它是一个ObjectInputStream
为什么我希望它停止读取对象(如果我可以发送另一个)在将来。
在我的情况下,只要ObjectInputStream
决定导致流结束的原因,就会抛出EOFException
。
代码段:
发送:
public synchronized void sendCommand(CommandBase command){
try {
commandOutputStream.writeUnshared(command);
commandOutputStream.flush();
System.out.println("Sent " + command.getAction().toString());
} catch (IOException e) {
System.out.println("Failed to send " + command.getAction().toString());
try {
commandOutputStream.close();
running = false;
this.dispose();
System.out.println("Closing command output stream");
} catch (IOException e1) {
e1.printStackTrace();
}
e.printStackTrace();
}
}
接收
while(going && tcpSender.running){
//Get action from stream
try {
System.out.println("Available bytes: " + commandInputStream.available());
Object command = ((CommandBase) commandInputStream.readObject());
System.out.println("Action received");
if (command instanceof CommandBase) {
if(((CommandBase)command).getAction().equals(ActionType.MouseAction)){
System.out.println("Mouse action");
//JOptionPane.showMessageDialog(null, "Received Mouse Action");
((MouseCommand)command).doAction(operator);
}else if(((CommandBase)command).getAction().equals(ActionType.KeyboardAction)){
System.out.println("Keyboard action");
//JOptionPane.showMessageDialog(null, "Received Keyboard Action: " + ((KeyboardCommand)command).toString());
((KeyboardCommand)command).doAction(operator);
}else if(((CommandBase)command).getAction().equals(ActionType.CheckBooleanAction)){
System.out.println("Check boolean action");
udpSender.notifyThis((CheckBooleanCommand)command);
}else{
//JOptionPane.showMessageDialog(null, "Received unknown command " + ((CommandBase)command).getAction().toString());
System.out.println("Action type is: " + ((CommandBase)command).getAction().toString());
}
}
} catch (EOFException e) {
System.out.println("EOF-Exception - end of stream reached");
e.printStackTrace();
continue;
} catch(IOException e){
System.out.println("IO-Exception - Unable to read action \n Closing socket");
try {
commandInputStream.close();
System.out.println("Closed command input stream");
} catch (IOException e1) {
e1.printStackTrace();
}
e.printStackTrace();
going = false;
tcpSender.running = false;
} catch (ClassNotFoundException e) {
System.out.println("Class not found - failed to cast to Action");
e.printStackTrace();
}
}
TL; DR: ObjectInputStream
如何确定它是流的结尾,并且是什么原因造成的? 我该如何解决这个问题?
错误信息:
`
java.io.ObjectInputStream $ BlockDataInputStream.peekByte处的java.io.EOFException(未知源)
在java.io.ObjectInputStream.readObject0(未知来源)
在java.io.ObjectInputStream.readObject(未知来源)
ObjectInputStream
如何确定它是流的结尾
当ObjectInputStream
尝试从基础流中读取时,就会发生这种情况,并且该流返回-1
...,这意味着已到达流的末尾。
是什么原因造成的?
在这种情况下,最可能的解释是远端(发送方)已关闭其套接字,或者它崩溃了……这将导致套接字关闭。
(从理论上讲,连接可能已断开,但这仅可能在晦涩的情况下发生,因此请忽略它。)
我该如何解决这个问题?
您需要了解为什么发送端关闭了套接字。 不幸的是,由于您提供的代码不是MCVE,我们不能说出原因。
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