/* * Copyright (c) 2000 David Flanagan.  All rights reserved. * This code is from the book Java Examples in a Nutshell, 2nd Edition. * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied. * You may study, use, and modify it for any non-commercial purpose. * You may distribute it non-commercially as long as you retain this notice. * For a commercial use license, or to purchase the book (recommended), * visit http://www.davidflanagan.com/javaexamples2. */package com.davidflanagan.examples.net;import java.io.*;import java.net.*;/** * This program sends e-mail using a mailto: URL **/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 its URLConnection            c.setDoInput(false);                  // Specify no input from it            c.setDoOutput(true);                  // Specify we'll do output            System.out.println("Connecting...");  // Tell the user            System.out.flush();                   // Tell them right now            c.connect();                          // Connect to mail host            PrintWriter out =                     // Get output stream to host                new PrintWriter(new OutputStreamWriter(c.getOutputStream()));            // Write out mail headers.  Don't let users fake the From address            out.print("From: \"" + from + "\" <" +		      System.getProperty("user.name") + "@" + 		      InetAddress.getLocalHost().getHostName() + ">\n");            out.print("To: " + to + "\n");            out.print("Subject: " + subject + "\n");            out.print("\n");  // 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.print(line + "\n");            }	                // Close (and flush) the stream to terminate the message             out.close();            // Tell the user it was successfully sent.            System.out.println("Message sent.");        }        catch (Exception e) {  // Handle any exceptions, print error message.            System.err.println(e);            System.err.println("Usage: java SendMail [<mailhost>]");        }    }}