Hi Juergen!
A few days ago you answered my question concerning javaīs
mailto-protocol and the exception produced by the appended source:
java.net.UnknownHostException: mailhost
Juergen> Sounds like a setup problem. Can you ping mailhost?
No. Another nice GUY suggested to mention the localhost as
mailhost in /etc/hosts. Appending the line "127.0.0.1 mailhost"
I was able to ping the mailhost. But that seems just to shift
the problem. Executing the program now leads to a
ConnectionRefused-Exception ...
You said the appended source works fine with your machine
and I agree that it most probably will be a setup-problem with
the mail-deamon. Could you just mail me the corresponding
line of your /etc/hosts? As far as I read the hosts-manpage
this line will customize the behavior of the mailhost.
This method might keep me out of irrelevant details ;-)
Christian
*********************** SendMail.java ****************************
import java.io.*;
import java.net.*;
public class SendMail {
public static void main(String[] args) {
try {
// If the user specified a mailhost, tell the system about it.
if (args.length >= 1) System.getProperties().put("mail.host",
args[0]);
// A Reader stream to read from the console
BufferedReader in = new BufferedReader(new
InputStreamReader(System.in));
// Ask the user for the from, to, and subject lines
System.out.print("From: ");
String from = in.readLine();
System.out.print("To: ");
String to = in.readLine();
System.out.print("Subject: ");
String subject = in.readLine();
// Establish a network connection for sending mail
URL u = new URL("mailto:" + to); // Create a mailto: URL
URLConnection c = u.openConnection(); // Create a URLConnection
for it
c.setDoInput(false); // Specify no input from
this URL
c.setDoOutput(true); // Specify we'll do output
System.out.println("Connecting..."); // Tell the user what's
happening
System.out.flush(); // Tell them right now
c.connect(); // Connect to mail host
PrintWriter out = // Get output stream to mail
host
new PrintWriter(new OutputStreamWriter(c.getOutputStream()));
// Write out mail headers. Don't let users fake the From address
out.println("From: \"" + from + "\" <" +
System.getProperty("user.name") + "@" +
InetAddress.getLocalHost().getHostName() + ">");
out.println("To: " + to);
out.println("Subject: " + subject);
out.println(); // blank line to end the list of headers
// Now ask the user to enter the body of the message
System.out.println("Enter the message. " +
"End with a '.' on a line by itself.");
// Read message line by line and send it out.
String line;
for(;;) {
line = in.readLine();
if ((line == null) || line.equals(".")) break;
out.println(line);
}
// Close the stream to terminate the message
out.close();
// Tell the user it was successfully sent.
System.out.println("Message sent.");
System.out.flush();
}
catch (Exception e) {
System.err.println(e);
System.err.println("Usage: java SendMail [<mailhost>]");
}
}
}
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