Sending information over tcp/ip or internet

[Sportsdude11751]

Hey, I have a client program that I would like to send a String or any type of information to the server, I was wondering how you would send the information to the server as well as have the server read it, thanks!

[nescafe]

Do have some code that you've been working on??

If not, take at look here for starters: http://java.sun.com/docs/books/tutor...ets/index.html

[Joe Beam]

Knock Knock example

http://java.sun.com/docs/books/tutor...entServer.html

[OctaviaAndreea]

Hello,
Here it is a simple client/server application:

SERVER:

import java.net.*;
import java.io.*;

class reply{

ServerSocket server=null; //soclul server-ului
Socket ClientSocket=null; //soclul returnat dupa aceptarea conexiunii
PrintWriter out=null; //fluxul de iesire
BufferedReader in=null; //fluxul de intrare
InputStreamReader ISR=null;
String intrare=null;
String iesire=null;

public reply(){}

//realizarea conexiunii
protected void connect()
{
try{
server=new ServerSocket(2008); //port-ul server-ului va fi 2008
}catch(IOException e)
{
System.out.println("Eroare 1:"+e.getMessage());
System.exit(1);
}

try{
//se asteapta conectarea clientilor
System.out.println("Astept clientii!!!");
ClientSocket=server.accept();
}catch(IOException e)
{
System.out.println("Eroare 2:"+e.getMessage());
System.exit(1);
}

try{
//dupa realizarea conexiunii se pregatesc fluxurile I/O ce vor facilita transferul de informatii
System.out.println("Client conectat.");
out=new PrintWriter(ClientSocket.getOutputStream(),true);
ISR=new InputStreamReader(ClientSocket.getInputStream());
in=new BufferedReader(ISR);

//primul mesaj de la server pe care il vede client-ul
out.println("Buna, tocmai te-ai conectat!!!");

//atata timp cat client-ul trimite text diferit de "Pa!" server-ul il trimite inapoi
//pe post de raspuns
while((intrare=in.readLine())!=null)
{
System.out.println("Recive:"+intrare);
if(intrare.equals("Pa!"))break;
out.println("reply: "+intrare);
}

//dupa "ruperea" conexiunii server-ul "face curat"
System.out.println("Conexiune anulata!!!");
out.close();
in.close();
ClientSocket.close();
server.close();

}catch(IOException e)
{
System.out.println("Eroare 3:"+e.getMessage());
System.exit(1);
}
}
}

public class ServerSide{
public static void main(String[] args)
{
reply t=new reply();
t.connect();
}
}

CLIENT:

import java.net.*;
import java.io.*;

class contact_server{

Socket soclu=null; //soclul client-ului
PrintWriter out=null; //flux de iesire
BufferedReader in=null; //flux de intrare
InputStreamReader ISR=null;
String intrare=null;
String iesire=null;

BufferedReader message=null; //s-a utilizat un obiect BufferedReader pentru a permite introducerea
//de text de la consola

public contact_server(){}

void send_message()
{
try{
//pentru cei care ruleaza aplicatiile pe masini diferite
//va puteti conecta folosind adresa IP a server-ului
//InetAddress addr = InetAddress.getByName("10.44.65.81");
//daca nu aveti un server si rulati ambele aplicatii pe acelasi calculator
//atunci procedati astfel:
InetAddress addr = InetAddress.getLocalHost();

int port = 2008;

//se creeaza soclul folosind adresa si port-ul pe care ruleaza server-ul
soclu=new Socket(addr,port);
}catch(IOException e)
{
System.out.println("Eroare 1:"+e.getMessage());
System.exit(1);
}

//se deschid fluxurile I/O pentru a putea comunica cu server-ul
try{
out=new PrintWriter(soclu.getOutputStream(),true);
ISR=new InputStreamReader(soclu.getInputStream());
in=new BufferedReader(ISR);

//trimiterea de mesaje server-ului se poate face atata timp cat acesta
//nu returneaza un null
while((intrare=in.readLine())!=null)
{
//se tipareste la consola mesajul receptionat de la server
System.out.println("Server "+intrare);

//se permite introducerea de text de la consola
message=new BufferedReader(new InputStreamReader(System.in));
System.out.flush();
System.out.print("Send:");
iesire=message.readLine();
//se trimite efectiv mesajul dorit catre server
if (iesire!=null)out.println(iesire);
else break;
}

//se inchide conexiunea
System.out.println("Conexiune anulata!!!");
out.close();
in.close();
message.close();
soclu.close();

}catch(IOException e)
{
System.out.println("Eroare 2:"+e.getMessage());
System.exit(1);
}
}
}

public class ClientSide{
public static void main(String[] args){
contact_server t=new contact_server();
t.send_message();
}
}

P.S. Ignore the code // !!!