Java TCP socket listener

Question

I have very simple TCP socket listener. I want to stop receiving data when the character is null or #.

while ((line = in.readLine()) != null && !line.equals("#")){
    tcpData = tcpData + line;
    }
server.close();

is not closing the socket as code flows. The socket closed only when I am closing from Hyperterminal. What I missed ?

1. Is the "#" sent by server? 2. Does the server end that line? 3. Does the server close the connection? — Fildor
– Fildor, Commented Nov 24, 2015 at 8:35
Have you considered consulting the Javadoc? There are three other read methods. — user207421
– user207421, Commented Nov 24, 2015 at 17:33

user207421 · Accepted Answer · 2015-11-24 08:52:14Z

1

Because readLine() only returns null at end of stream, which only occurs in TCP sockets when the peer has closed the connection.

... and clearly you are never sending a line consisting of # plus a line terminator.

answered Nov 24, 2015 at 8:52

user207421

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2 Comments

Haim Rodrik Over a year ago

Remote terminal sending sensor data . For example string as $353323058181636,EV,D,T,567888.9,+12C,FFFFE000# which $ is start character and # is end of data character. Each packet coming every minute. In my case when data ends socket need close the socket.

user207421 Over a year ago

So you're reading lines but it isn't sending lines. So don't use readLine().

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