Is it possible to read from ObjectInputStream
in while loop which will terminate by exception thrown by socket timeout socket.setSoTimeout(4000);
while(Object obj = ois.readObject()) { <-- Not Working
//do something with object
}
while(Object obj = ois.readObject()) { <-- Not Working
//do something with object
}
When you say 'not working', what you really mean is 'not compiling', for reasons that are stated in the compiler message: Object
isn't a boolean
expression, and you can't declare a variable in a while
condition.
However the code isn't valid anyway. The correct way to read to end of stream of an arbitrary ObjectInputStream
is catch EOFException
, for example as follows:
try
{
for (;;)
{
Object object = in.readObject();
// ...
}
}
catch (SocketTimeoutException exc)
{
// you got the timeout
}
catch (EOFException exc)
{
// end of stream
}
catch (IOException exc)
{
// some other I/O error: print it, log it, etc.
exc.printStackTrace(); // for example
}
Note that the suggestion in comments to test the readObject()
return value for null
is not correct. It will only return null
if you wrote a null
.
This is not working because the statement was written inside while() is not a boolean expression, So we can write this as below:
Object obj = null;
while ((obj = ois.readObject()) != null) {
//do something with object
}
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