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JSP AND OTHER WEB COMPONENTS
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The complete SMTP protocol specification is in RFC 821, which can be found at http://wwwfreesoftorg/CIE/RFC/821/indexhtm
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JSP: The Complete Reference
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SMTP mail can be sent simply by opening a javanetSocket to the mail host, and using its input and output streams, as shown in the example This socket-based approach has the advantage of being easy to implement, but it becomes more complex when things like attachments are added For this reason, few applications use it directly
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The sunnetsmtpSmtpClient Class
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Another option is to use the sunnetsmtpSmtpClient supplied with the Java Runtime Environment (JRE) from Sun Microsystems This class is a thin object-oriented wrapper around the raw SMTP socket protocol The SmtpClient version of the preceding example is listed here:
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import javaio*; import sunnet*; import sunnetsmtp*; public class MailTest { public static void main(String[] args) throws Exception { SmtpClient client = new SmtpClient("maillyricnotecom"); clientfrom("phanna@lyricnotecom"); clientto("phanna@lyricnotecom"); PrintStream out = clientstartMessage(); outprintln("SUBJECT: Mail test"); outprintln("This is a test of the mail system"); outprintln("This is only a test"); outprintln("Beeeeeeeeeeeeeeeeeeeeeeeep"); outprintln("This concludes the test of the mail system"); clientcloseServer(); } }
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While this approach is marginally simpler than using sockets, it suffers from one major drawback: the sunnet* classes are undocumented and subject to change Sun allows them to be used (indeed, the Sun JRE won t work without them), but warns they can be changed or dropped from future versions with no notice
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The JavaMail API
The third option is the JavaMail API JavaMail is a set of API s that model the components of a mail system in an abstract way a pluggable architecture for POP, SMTP, IMAP, and other mail protocols JavaMail is available for JDK 11x and higher, and is a required component of the Java 2 Enterprise Edition (J2EE) JavaMail includes classes both for sending and receiving mail Only the sending side is considered here The JavaMail classes and complete documentation can be downloaded from http://javasuncom/products/javamail JavaMail s highlights are illustrated here, with the same example shown previously:
import javautil*; import javaxmail*; import javaxmailinternet*; public class JavaMailTest { public static void main(String[] args) throws Exception { // Create a session with the LyricNote mail host Properties props = new Properties(); propsput("mailhost", "maillyricnotecom"); Session mailSession = SessiongetInstance(props, null); // Create address objects for the sender and receiver Address fromUser = new InternetAddress("phanna@lyricnotecom"); Address toUser = new InternetAddress("phanna@lyricnotecom"); // Create the message body Message body = new MimeMessage(mailSession); bodysetFrom(fromUser); bodysetRecipient(MessageRecipientTypeTO, toUser);
JSP AND OTHER WEB COMPONENTS
JSP: The Complete Reference
bodysetSubject("Mail Test"); bodysetContent( "This is a test of the mail system\n" + "This is only a test\n" + "Beeeeeeeeeeeeeeeeeeeeeeeeeeeeep\n" + "This concludes the test of the mail system", "text/plain"); // Send the message Transportsend(body); } }
Typically, seven steps are involved in sending mail with JavaMail: 1 Create a session to the mail host using SessiongetInstance() 2 Create sender and recipient address objects with new InternetAddress() 3 Create a message body with new MimeMessage(Session session) 4 Specify the addresses with the Message object s setFrom() and setRecipient() 5 Specify the subject with setSubject() 6 Specify the message body and encoding type with setContent() 7 Send the message with Transportsend(message) The first step creates a new Session object Session acts as the connection to the mail host A new instance of this object is obtained by calling the static method SessiongetInstance(Properties props, Authenticator auth) The properties supplied to this method must include, at a minimum, the mail host The auth parameter can be null if no authentication is required Step two represents the sender and recipient(s) as InternetAddress objects This class models addresses according to RFC 822, Standard for the Format of ARPA Internet Text Messages, which can be obtained from http://wwwfreesoftorg/CIE/RFC Next, a message body object is created with new MimeMessage() This class represents a multipart Internet mail message, including its content and headers The constructor takes a reference to the Session object, so the message can be related to the mail host and other session parameters
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