Java Sockets TCP send and receive -

i tried many examples , none worked expect. need?

1. send packet through ip , port.
2. wait until server response , close socket.

example:

[client] send: "hi server" [client] wait [server] send: "hi client" [client] receive response [client] close socket 

i need tcp client, server side solved.

tried: http://www.careerbless.com/samplecodes/java/beginners/socket/socketbasic1.php

my code

public class sendpacket {      public void send() throws exception{          socket socket = null;         objectoutputstream oos = null;         objectinputstream ois = null;          socket = new socket(ip, port);         oos = new objectoutputstream(socket.getoutputstream());          string msg = "dspsyssts";         oos.write(msg.getbytes());         oos.flush();          //read server response message         ois = new objectinputstream(socket.getinputstream());         string message = (string) ois.readobject();          runwincmd runcmd = new runwincmd();         runcmd.run("notepad.exe \"" + message + "\"");         //close resources         ois.close();         oos.close();      } } 

you have initialise streams in particular order.

try (not tested):

public class sendpacket {      public void send() throws exception{          socket socket = null;         objectoutputstream oos = null;         objectinputstream ois = null;          socket = new socket(ip, port);         oos = new objectoutputstream(socket.getoutputstream());         ois = new objectinputstream(socket.getinputstream());          string msg = "dspsyssts";         oos.write(msg.getbytes());         oos.flush();          //read server response message         string message = (string) ois.readobject();          runwincmd runcmd = new runwincmd();         runcmd.run("notepad.exe \"" + message + "\"");         //close resources         ois.close();         oos.close();         socket.close();//!!!!      } }