JSP and JavaMail (2)

3. Introduction to common classes of JavaMail
Instructions in advance:
Users who have never used JavaMail can understand these introductions, but it doesn't matter. There are specific examples in the subsequent articles. You can also come back to view the usage of these classes.
(1) javax. mail. Properties class
JavaMail needs Properties to create a session object. It will look for the string "mail. smtp. host". The attribute value is the host that sent the mail.
Usage:
Properties props = new Properties ();
Props. put ("mail. smtp. host", "smtp.163.com"); // you can replace it with your smtp host name.
(2) javax. mail. Session class
This Session class represents an email session in JavaMail. Each JavaMail-based application has at least one session, but can have any number of sessions.
In this example, the Session object needs to know the SMTP server used to process the mail.
Usage:
Session sendMailSession;
SendMailSession = Session. getInstance (props, null );
(3) javax. mail. Transport class
An email can be sent or received. JavaMail uses two different classes to complete these two functions: Transport and Store. Transport are used to send information, while Store is used to receive mail. For this tutorial, we only need to use the Transport object.
Usage:
Transport transport;
Transport = sendMailSession. getTransport ("smtp ");
Use the getTransport method of the JavaMail Session object to initialize the Transport. The passed string declares the protocol used by the object, such as "smtp ". This saves us a lot of time. Because JavaMail has many built-in protocol implementation methods.
Note: JavaMail does not absolutely support every protocol. Currently, it supports IMAP, SMTP, and POP3.
(4) javax. mail. MimeMessage class
The Message object stores the actually sent email information. The Message object is created as a MimeMessage object and needs to know which JavaMail session should be selected.
Usage:
Message newMessage = new MimeMessage (sendMailSession );
(5) javax. mail. InternetAddress class
Once you have created a Session and Message, and entered the content into the Message, you can use Address to determine the mail Address. Like Message, Address is also an abstract class. You are using the Javax. mail. internet. InternetAddress class.
Usage:
InternetAddress from = new InternetAddress ("xxf@cafe.com ");
(6) javax. mail. Store class
The Store class implements reading, writing, monitoring, and searching operations on specific mail protocols. You can use the Javax. mail. Store class to access the Javax. mail. Folder class.