Setting a timeout for socket operations

Question

When I create a socket   Socket socket   new Socket ipAddress  port     It throws an exception  which is OK  because the IP address is not available   The test variables where String ipAddress    192 168 0 3  and int port   300    The problem is  how do I set it to timeout for that socket   When I create the socket  how do I reduce the time before I get a UnknownHostException and get the socket to timeout

User · Answer

Use the Socket   constructor  and connect SocketAddress endpoint  int timeout  method instead   In your case it would look something like   Socket socket   new Socket    socket connect new InetSocketAddress ipAddress  port   1000       Quoting from the documentation     connect  public void connect SocketAddress endpoint  int timeout  throws IOException       Connects this socket to the server with a specified timeout value  A timeout of zero is interpreted as an infinite timeout  The connection will then block until established or an error occurs       Parameters       endpoint - the SocketAddress    timeout - the timeout value to be used in milliseconds        Throws       IOException - if an error occurs during the connection     SocketTimeoutException - if timeout expires before connecting     IllegalBlockingModeException - if this socket has an associated channel  and the channel is in non-blocking mode      IllegalArgumentException - if endpoint is null or is a SocketAddress subclass not supported by this socket      Since           1 4

User · Answer

You can t control the timeout due to UnknownHostException  These are DNS timings  You can only control the connect timeout given a valid host  None of the preceding answers addresses this point correctly   But I find it hard to believe that you are really getting an UnknownHostException when you specify an IP address rather than a hostname   EDIT To control Java s DNS timeouts see this answer

User · Answer

Use the default constructor for Socket and then use the connect   method

User · Answer

You don t set a timeout for the socket  you set a timeout for the operations you perform on that socket   For example socket connect otherAddress  timeout   Or socket setSoTimeout timeout  for setting a timeout on read   operations   See   http   docs oracle com javase 7 docs api java net Socket html

User · Answer

You could use the following solution   SocketAddress sockaddr   new InetSocketAddress ip  port      Create your socket Socket socket   new Socket       Connect with 10 s timeout socket connect sockaddr  10000     Hope it helps

[java] Setting a timeout for socket operations

Examples related to java

Examples related to sockets