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This article introduces how to achieve Mail email sending and receiving function in Java, the content is very detailed, interested friends can refer to, hope to be helpful to you.

JavaMail API can be divided into the following three categories according to its functions:

①, API for creating and parsing messages

②, API for sending mail

③, API for receiving email

The above three types of API are composed of multiple classes in JavaMail, but there are mainly four core classes. When we write programs, we can easily write Java mail handlers by keeping these four core classes in mind.

①, Message class: the javax.mail.Message class is the core API for creating and parsing messages, which is an abstract class, usually using its subclass javax.mail.internet.MimeMessage class. Its instance object represents an email. When the client program sends mail, it first uses the JavaMail API that created the mail to create a Message object that encapsulates the mail data, and then passes this object to the mail sending API (Transport class) to send. When the client program receives the mail, the mail receiving API encapsulates the received mail data in the instance of the Message class, and the client program uses the mail parsing API to parse the received mail data from this object.

②, Transport class: the javax.mail.Transport class is the core API class that sends mail, and its instance object represents the mail sending object that implements a certain mail sending protocol, such as SMTP protocol. After the client program creates the Message object, it only needs to use the mail to send API to get the Transport object, then pass the Message object to the Transport object, and call its sending method, and then send the mail to the specified SMTP server.

③, Store class: the javax.mail.Store class is the core API class that receives mail. Its instance object represents the mail receiving object that implements a certain mail receiving protocol, such as POP3 protocol. When the client program receives mail, it only needs to use the mail receiving API to get the Store object, and then call the receiving method of the Store object to obtain the mail data from the specified POP3 server. And encapsulate the mail data into a Message object that represents the message.

④, Session class: the javax.mail.Session class is used to define the environment information required by the entire application, and to collect session information for the client to establish a network connection with the mail server, such as the hostname, port number, and mail sending and receiving protocols adopted by the mail server. The Session object builds Transport and Store objects for sending and receiving mail based on this information, and provides information support when creating Message objects for clients.

On how to achieve Mail email sending and receiving function in Java is shared here, I hope the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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