TCPIP Client (handling specific exceptions)

[ravian]

I have a TCPIP client with following code.

try {
	smtpSocket = new Socket("javabook", 22122);
	os = new DataOutputStream(smtpSocket.getOutputStream());
	is = new DataInputStream(smtpSocket.getInputStream());
	} catch (Exception ex) {
	System.out.println("Some error has occured");
	}

I want to catch specific exceptions for Port and for hostname. Please advice.

[javagk]

It is always a wise idea to catch specific exceptions. Try the following:

try {
     smtpSocket = new Socket("javabook", 22122);
     os = new DataOutputStream(smtpSocket.getOutputStream());
     is = new DataInputStream(smtpSocket.getInputStream());
     } catch (UnknownHostException e) {
        System.err.println("Don't know about host: hostname");
     } catch (IOException e) {
	System.err.println("Couldn't get I/O for the connection to: hostname");
}

[ravian]

Thanks javagk.
I tested it and it works perfectly fine.

[javaplus]

Thanks guys. It was helpful.
Just checked the Java docs and it says:

public Socket(InetAddress address, int port)
Throws:
IOException - if an I/O error occurs when creating the socket. 
SecurityException - if a security manager exists and its checkConnect method doesn't allow the operation.