How do I create a TCP socket in Java?
How do I create such a TCP connection that it terminates only when I tell it to otherwise it remains open?
How do I use keepalives to know whether the server or client is still available?
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2 Answers
How do I create a TCP socket in Java?
Socket socket = new Socket(hostname, port);
http://docs.oracle.com/javase/tutorial/networking/sockets/index.html
How do I create such a TCP connection that it terminates only when I tell it to otherwise it remains open?
They will remain open until either you or the other end closes it.
How do I use keepalives to know whether the server or client is still available?
That is up to you. You can send different messages, one of which is a heartbeat which tells the other end you are alive.
A common thing to do if you are sending binary messages is to send the length as an unsigned short or int value. I use a message of "length" 0 as a heartbeat.
1 Comment
user207421
Your message of length zero would never get sent unless it has some application protocol around it. I assume that's what you mean?
The class java.net.Socket is what you are searching for.
