java - How to make client socket wait for server socket -


if client socket opens before server socket, java generate connectionexception. have check whether server available , keep waiting before executing

socketchannel.open(hostname, port)

in client thread. i've found related api:

inetaddress.getbyname(hostname).isreachable()

however, still can't tell whether socket on specific port open. think problem should common didn't useful information google , other places.

boolean scanning=true; while(scanning) {     try     {         socketchannel.open(hostname, port);         scanning=false;     }     catch(connectionexception e)     {         system.out.println("connect failed, waiting , trying again");         try         {             thread.sleep(2000);//2 seconds         }         catch(interruptedexception ie){             ie.printstacktrace();         }     }  }

this code sonics comment


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