socket example
http://zerioh.tripod.com/ressources/sockets.html
// Server
public class Provider
{
ServerSocket providerSocket;
Socket connection = null;
ObjectOutputStream out;
ObjectInputStream in;
String message;
Provider()
{
}
void run()
{
try
{
// 1. creating a server socket
providerSocket = new ServerSocket(2004, 10);
// 2. Wait for connection
System.out.println("Waiting for connection");
connection = providerSocket.accept();
System.out.println("Connection received from "
+ connection.getInetAddress().getHostName());
// 3. get Input and Output streams
out = new ObjectOutputStream(connection.getOutputStream());
out.flush();
in = new ObjectInputStream(connection.getInputStream());
sendMessage("Connection successful");
// 4. The two parts communicate via the input and output streams
do
{
try
{
message = (String) in.readObject();
System.out.println("client>" + message);
if (message.equals("bye"))
sendMessage("bye");
} catch (ClassNotFoundException classnot)
{
System.err.println("Data received in unknown format");
}
} while (!message.equals("bye"));
} catch (IOException ioException)
{
ioException.printStackTrace();
} finally
{
// 4: Closing connection
try
{
in.close();
out.close();
providerSocket.close();
} catch (IOException ioException)
{
ioException.printStackTrace();
}
}
}
void sendMessage(String msg)
{
try
{
out.writeObject(msg);
out.flush();
System.out.println("server>" + msg);
} catch (IOException ioException)
{
ioException.printStackTrace();
}
}
public static void main(String args[])
{
Provider server = new Provider();
while (true)
{
server.run();
}
}
}
// Client
public class Requester
{
Socket requestSocket;
ObjectOutputStream out;
ObjectInputStream in;
String message;
Requester()
{
}
void run()
{
try
{
// 1. creating a socket to connect to the server
requestSocket = new Socket("localhost", 2004);
System.out.println("Connected to localhost in port 2004");
// 2. get Input and Output streams
out = new ObjectOutputStream(requestSocket.getOutputStream());
out.flush();
in = new ObjectInputStream(requestSocket.getInputStream());
// 3: Communicating with the server
do
{
try
{
message = (String) in.readObject();
System.out.println("server>" + message);
sendMessage("Hi my server");
message = "bye";
sendMessage(message);
} catch (ClassNotFoundException classNot)
{
System.err.println("data received in unknown format");
}
} while (!message.equals("bye"));
} catch (UnknownHostException unknownHost)
{
System.err.println("You are trying to connect to an unknown host!");
} catch (IOException ioException)
{
ioException.printStackTrace();
} finally
{
// 4: Closing connection
try
{
in.close();
out.close();
requestSocket.close();
} catch (IOException ioException)
{
ioException.printStackTrace();
}
}
}
void sendMessage(String msg)
{
try
{
out.writeObject(msg);
out.flush();
System.out.println("client>" + msg);
} catch (IOException ioException)
{
ioException.printStackTrace();
}
}
public static void main(String args[])
{
Requester client = new Requester();
client.run();
}
}