smtp.rar_smtp java_stmp

import java.io.*; import java.net.*; import java.util.*; public class SMTPClientDemo { protected int port = 25; protected String hostname = "localhost"; protected String from = ""; protected String to = ""; protected String subject = ""; protected String body = ""; protected Socket socket; protected BufferedReader br; protected PrintWriter pw; // Constructs a new instance of the SMTP Client public SMTPClientDemo() throws Exception { try { getInput(); sendEmail(); } catch (Exception e) { System.out.println ("Error sending message - " + e); } } public static void main(String[] args) throws Exception { // Start the SMTP client, so it can send messages SMTPClientDemo client = new SMTPClientDemo(); } // Check the SMTP response code for an error message protected int readResponseCode() throws Exception { String line = br.readLine(); System.out.println("< "+line); line = line.substring(0,line.indexOf(" ")); return Integer.parseInt(line); } // Write a protocol message both to the network socket and to the screen protected void writeMsg(String msg) throws Exception { pw.println(msg); pw.flush(); System.out.println("> "+msg); } // Close all readers, streams and sockets protected void closeConnection() throws Exception { pw.flush(); pw.close(); br.close(); socket.close(); } // Send the QUIT protocol message, and terminate connection protected void sendQuit() throws Exception { System.out.println("Sending QUIT"); writeMsg("QUIT"); readResponseCode(); System.out.println("Closing Connection"); closeConnection(); } // Send an email message via SMTP, adhering to the protocol known as RFC 2821 protected void sendEmail() throws Exception { System.out.println("Sending message now: Debug below"); System.out.println("--------------------------------------------------------------"); System.out.println("Opening Socket"); socket = new Socket(this.hostname,this.port); System.out.println("Creating Reader & Writer"); br = new BufferedReader(new InputStreamReader(socket.getInputStream())); pw = new PrintWriter(new OutputStreamWriter(socket.getOutputStream())); System.out.println("Reading first line"); int code = readResponseCode(); if(code != 220) { socket.close(); throw new Exception("Invalid SMTP Server"); } System.out.println("Sending helo command"); writeMsg("HELO "+InetAddress.getLocalHost().getHostName()); code = readResponseCode(); if(code != 250) { sendQuit(); throw new Exception("Invalid SMTP Server"); } System.out.println("Sending mail from command"); writeMsg("MAIL FROM:<"+this.from+">"); code = readResponseCode(); if(code != 250) { sendQuit(); throw new Exception("Invalid from address"); } System.out.println("Sending rcpt to command"); writeMsg("RCPT TO:<"+this.to+">"); code = readResponseCode(); if(code != 250) { sendQuit(); throw new Exception("Invalid to address"); } System.out.println("Sending data command"); writeMsg("DATA"); code = readResponseCode(); if(code != 354) { sendQuit(); throw new Exception("Data entry not accepted"); } System.out.println("Sending message"); writeMsg("Subject: "+this.subject); writeMsg("To: "+this.to); writeMsg("From: "+this.from); writeMsg(""); writeMsg(body); code = readResponseCode(); sendQuit(); if(code != 250) throw new Exception("Message may not have been sent correctly"); else System.out.println("Message sent"); } // Obtain input from the user protected void getInput() throws Exception { // Read input from user console String data=null; BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); // Request hostname for SMTP server System.out.print("Please enter SMTP server hostname: "); data = br.readLine(); if (data == null || data.equals("")) hostname="localhost"; else hostname=data; // Request the sender's email address System.out.print("Please enter FROM email address: "); data = br.readLine(); from = data; // Request the recipient's email address System.out.print("Please enter TO email address :"); data = br.readLine(); if(!(data == null || data.equals(""))) to=data; System.out.print("Please enter subject: "); data = br.readLine(); subject=data; System.out.println("Please enter plain-text message ('.' character on a blank line signals end of message):"); StringBuffer buffer = new StringBuffer(); // Read until user enters a . on a blank line String line = br.readLine(); while(line != null) { // Check for a '.', and only a '.', on a line if(line.equalsIgnoreCase(".")) { break; } buffer.append(line); buffer.append("\n"); line = br.readLine(); } buffer.append(".\n"); body = buffer.toString(); } }