CODEWITHSUNDEEP
android
Cong Hui
Cong Hui

Reputation: 633

can't connect to the server, TCP socket android

I am trying to open up a TCP socket in my client application so that it can talk to my server.
after going through the documentation, i am curious about the socket constructor, which takes two parameters.

Socket(InetAddress dstAddress, int dstPort)
Creates a new streaming socket connected to the target host specified by the parameters dstAddress and dstPort.

and its description is as above. So as I learned, after creating the socket, I should have explicitly called the connect function in order for it to connect to the server. But in some TCP client sample codes I found online, none of them actually calls the connect function

connect(SocketAddress remoteAddr, int timeout)

So I am thinking if the constructor automatically connects to the server after being created? the three-ways handshake is done. or I have to explicitly call the connect function after the constructor? Thank you so much

Upvotes: 0

Views: 1392

Answers (2)

Philipp Reichart
Philipp Reichart

Reputation: 20961

Only the two constructors that don't take any kind of target do not connect:

  • Socket() Creates a new unconnected socket.

  • Socket(Proxy) Creates a new unconnected socket using the given proxy type.

All the other constructors where you pass the target as hostname or address do connect:

  • Socket(String, int) Creates a new streaming socket connected to the target host specified by the parameters dstName and dstPort.

  • Socket(String, int, InetAddress, int) Creates a new streaming socket connected to the target host specified by the parameters dstName and dstPort.

  • Socket(InetAddress, int) Creates a new streaming socket connected to the target host specified by the parameters dstAddress and dstPort.

  • Socket(InetAddress, int, InetAddress, int) Creates a new streaming socket connected to the target host specified by the parameters dstAddress and dstPort.

I left out the two deprecated constructors.

This is straight from the Android API documentation for java.lang.Socket.

Upvotes: 1

rciovati
rciovati

Reputation: 28063

Socket constructors work according with the documentation, some make also connection, other not. Please see: http://download.oracle.com/javase/6/docs/api/java/net/Socket.html

Handshake is automatically done, you don't need to take care of it.

Upvotes: 0

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