Re: Java socket....

From:

=?ISO-8859-15?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>

Newsgroups:

comp.lang.java.programmer

Date:

Mon, 19 Apr 2010 19:48:50 -0400

Message-ID:

<4bccebdb$0$284$14726298@news.sunsite.dk>

On 19-04-2010 06:10, Felce e Mirtillo wrote:

Hi all,

I'm writing an application to interface a device ( industrial balance )
to a PC via TCP/IP... well the device acts as Server and my application
is a listening client.

Th client receive a single string
<stx>dd/mm/yyyy;hh:mm;0000000000;A;0000000000<etx>
that I read with... a method like this:

...
byte[] buffer = new byte[100];
int count = 0, offset = 0;

count = socket.getInputStream().read();
while (count > 0 && count != 3) {
buffer[offset++] = count;
count = socket.getInputStream().read();
}
String line = new String(buffer, 1, offset);
String[] dati = new String[5]
offset = 0;
for(StringTokenizer t = new StringTokenizer(line, ";");
t.hasMoreTokens();) dati[offset++] = t.nextToken();
...

well the method is in a loop where I'd would trap
some events. The most important is... if someone
swich off the device and then switch off... the
previous method remain 'blocked' waiting the next
byte ...
I've tryed several Socket methods.. but no one of
them is usefull in order to intercept the death
of tcp/ip connection...

What can I do... ???

Eventually you will get an exception, but it takes time.

TCP/IP was designed to be able to handle slow unreliable network,
so it is patient.

To lower it you could try:

socket.setSoTimeout(1000);

Arne

PS: I think the code would be simpler if you wrapped the
InputStream in a BufferedReader and used String.split
instead of StringTokenizer.

(I apologize for my poor english.. I hope it is better than your average
italian :P :P )