question about streams

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Jackie - 28 Apr 2006 22:27 GMT

Hello

I have a little problem with the following code (s2c is a socket):

is = s2c.getInputStream();
br = new BufferedReader(new InputStreamReader(is));
oi = new ObjectInputStream(is); //here my program hangs. How can I
solve this? Or is it impossible to make 2 streams from one InputStream?

As a student, I'm just starting with java. So maybe it's something very
stupid:)
Thanks, Chris

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Monique Y. Mudama - 28 Apr 2006 22:55 GMT

> Hello
>
[quoted text clipped - 7 lines]
> As a student, I'm just starting with java. So maybe it's something very
> stupid:)

What are you trying to accomplish by doing this?

Depending on what you're trying to do, would it make sense to do

oi = new ObjectInputStream(br);

?

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Jackie - 29 Apr 2006 09:29 GMT

br is a character stream, while oi (ObjectInputStream) is of course a
bytestream, so i don't think oi = new ObjectInputStream(br); will work
i have to send and receive tekst en objects through a socket. i can
also recieve my Strings with an objectinputstream but i want to use a
bufferedreader because i need some functions of it that
objectinputstream doesn't have. So i just want to be able to set an
objectinputstream on the inputstream of the socket while there is also
constantly an bufferedreader on the inputstream. Is there a way to do
so?

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Rhino - 29 Apr 2006 15:55 GMT

> br is a character stream, while oi (ObjectInputStream) is of course a
> bytestream, so i don't think oi = new ObjectInputStream(br); will work
> i have to send and receive tekst en objects

"tekst en" objects??

What's that in English?

Even if I assume that this is just sloppy typing with transposed characters,
I can't think of any English word that resembles this that would make sense
in this context.....

> through a socket. i can
> also recieve my Strings with an objectinputstream but i want to use a
[quoted text clipped - 3 lines]
> constantly an bufferedreader on the inputstream. Is there a way to do
> so?

--
Rhino

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Chris Uppal - 29 Apr 2006 16:33 GMT

> "tekst en" objects??
>
> What's that in English?

Text and objects.

-- chris

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EJP - 30 Apr 2006 08:51 GMT

> br is a character stream, while oi (ObjectInputStream) is of course a
> bytestream, so i don't think oi = new ObjectInputStream(br); will work
[quoted text clipped - 5 lines]
> constantly an bufferedreader on the inputstream. Is there a way to do
> so?

Both ObjectInputStream and BufferedReader do buffering internally, so
they are *bound* to interfere with each other no matter which way you
stack them up. You might think that new BufferedReader(new
InputStreamReader(new ObjectInputStream(socket.getInputStream()))) might
be plausible but it isn't. You need to rethink your requirement.

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Gordon Beaton - 29 Apr 2006 10:37 GMT

> I have a little problem with the following code (s2c is a socket):
>
> is = s2c.getInputStream();
> br = new BufferedReader(new InputStreamReader(is));
> oi = new ObjectInputStream(is); //here my program hangs. How can I
> solve this? Or is it impossible to make 2 streams from one InputStream?

You will likely create more problems than you solve by forking the
stream that way. Reconsider your design.

However the ObjectInputStream constructor hangs for a completely
unrelated reason: it is waiting for corresponding ObjectOutputStream
constructor to send some header information.

/gordon

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