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If you'd like to see what is going on behind the scenes, or need further information for debugging purposes, simply set the maildebug property to a String value of "true" In this example, you could add the following line here:
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propput ("maildebug", "true");
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We pass this information on to JavaMail, when we request an instance of the Session class, by using the static method SessiongetInstance() It takes as a parameter a Properties object and an Authenticator object (which can be set to null)
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// Get a session, with the specified properties Session mySession = SessiongetInstance (prop, null);
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Once you have a Session object, you can then begin to create a mail message Remember that the Message class is an abstract class, so we need to use a concrete implementation We create a new instance of a MimeMessage (which is used to handle a variety of message types, including plain text), and pass to its constructor our Session object (needed later when we want to transmit the messsage) Then we can begin to populate our message with data, such as the subject and message contents
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// Create a message to send, specifying our session Message message = new MimeMessage (mySession); messagesetSubject ("Test message"); messagesetContent ("This is a test message", "text/plain");
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Addressing the message is slightly more complicated We can't specify a "To:" or "From:" address simply by passing a String Instead, an Address instance must be passed For news messages, we would pass a NewsAddress instance, but for mail messages we pass an InternetAddress instance You'll notice too that for the "From:" address, two parameters are used An InternetAddress can take a raw e-mail address, or an e-mail address and a personal name In this case, we use "nobody@nowherecom" as the e-mail address, and "SendMailDemo" as the person NOTE An InternetAddress is not the same as a javanetInetAddress There are also different types of recipient addresses (TO, CC, and BCC) A TO address is sent to the named recipient, while a CC address is sent as a carbon copy A BCC address is sent as a blind carbon copy; that is, other recipients of the message won't know that it was sent to the address listed as BCC The address types are represented by constants defined in MessageRecipientType:
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// Create an InternetAddress, for specifying recipient InternetAddress toAddr = new InternetAddress ( to ); messagesetRecipient (MessageRecipientTypeTO, toAddr); // Create an InternetAddress, for specifying sender address InternetAddress fromAddr= new InternetAddress ( "nobody@nowherecom", "SendMailDemo" ); messagesetFrom (fromAddr);
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Finally, we are able to send the message Sending the message is the easiest part of all Simply call the static method Transportsend( Message ), and the message will be sent Transport knows the correct mail settings, because our message knows the correct Session instance, which was created earlier If you want finer control over message sending, you can request a Transport instance and open connections yourself For a single message, however, this is the easiest way of delivery
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// Send the message Transportsend(message);
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We also need to wrap most of this code in exception handlers, as there are plenty of errors that can occur at runtime For example, the address specified by the user might not be an actual address (if the user mixed up the order of parameters) The SMTP server might be incorrect, or might be down These are a few of the many errors that can occur at runtime For this reason, applications must at least catch a MessagingException Running SendMailDemo You'll need to specify the hostname for an SMTP server on your local network, or the SMTP server of your Internet service provider You'll also need to specify your e-mail address, so that you can check whether the message was delivered correctly The syntax for the SendMailDemo is as follows:
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