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String str = "String that you want to transmit";

// Create a socket to the host
String hostname = hostName;

int port = portNumber;

InetAddress addr = InetAddress.getByName(hostname);

Socket socket = new Socket(addr, port);

// Send data
BufferedWriter wr = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "BIG5"));

wr.write(str);

wr.flush();

// Get response
BufferedReader rd = new BufferedReader(new InputStreamReader(socket.getInputStream(),"BIG5"));

String line;

while ((line = rd.readLine()) != null) 

{

System.out.println(line);

}
wr.close();

rd.close();

}

 catch (Exception e) 

{

}

ref : http://www.exampledepot.com/egs/java.net/PostSocket.html