[JAVA100 example]045, sending a message using the SMTP protocol

Import java.net.*;


import java.io.*;


/**


* <p>title: Send mail using SMTP </p>


* <p>description: This example sends mail based on the SMTP protocol </p>
by using the socket method

* <p>copyright:copyright (c) 2003</p>


* <p>Filename:sendSMTPMail.java</p>


* @version 1.0


*/


public class Sendsmtpmail {


/**


*<br> Method Description: Main method


*<br> Input Parameters: 1. Server ip;2. Email address


*<br> return type:


*/


public static void Main (string[] arges) {


if (arges.length!=2) {


System.out.println ("Use Java sendsmtpmail hostname | mail to ");


return;


　 }


Sendsmtpmail t = new Sendsmtpmail ();


T.sendmail (Arges[0], arges[1]);


　 }


/**


*<br> Method Description: Send mail


*<br> input parameter: String mailserver mail receiving server


*<br> input parameter: String recipient receive mail address


*<br> return type:


*/


public void SendMail (string mailserver, String recipient) {


try {


//With socket Open 25 port


socket s = new socket (mailserver, 25);


//cache input and output


BufferedReader in = new BufferedReader


(New InputStreamReader (S.getinputstream (), "8859_1"));


BufferedWriter out = new BufferedWriter


(New OutputStreamWriter (S.getoutputstream (), "8859_1"));


//issue "HELO" command to express greetings to the server


send (in, out, "HELO theworld");


//Tell the server my email address, some servers have to check this address


send (in, out, "MAIL from: <>");


//Use the "RCPT to" command to tell the server to explain the e-mail address of the message


send (in, out, "RCPT to:" + recipient);


Sending a "DATA" means that the following will be the message body


send (in, out, "DATA");


//Use subject command to annotate message subject


Send (out, "Subject: This is a test program!") ");


//Use "from" to mark the source of the message


Send (out, "From:riverwind <>");


Send (out, "\ n");


//Message body


Send (out, "This is a message sent using the SMTP protocol!") If disturb please delete! ");


Send (out, "\n.\n");


//Send "QUIT" Port Mail


send (in, out, "QUIT");


S.close ();


　　　}


catch (Exception e) {


E.printstacktrace ();


　　　}


　 }


/**


*<br> Method Description: Send a message and receive a reply


*<br> input Parameters:


*<br> return type:


*/


public void Send (BufferedReader in, BufferedWriter out, String s) {


try {


Out.write (s + "\ n");


Out.flush ();


System.out.println (s);


s = in.readline ();


System.out.println (s);


　　　}


catch (Exception e) {


E.printstacktrace ();


　　　}


　 }


/**


*<br> Method Description: Overloaded method. Write information to the socket


*<br> input parameter: BufferedWriter out output buffer


*<br> input parameter: Information written by String s


*<br> return type:


*/


public void Send (BufferedWriter out, String s) {


try {


Out.write (s + "\ n");


Out.flush ();


System.out.println (s);


　　　}


catch (Exception e) {


E.printstacktrace ();


　　　}


　 }


}