Send email via Java code 1 (58), java code send email 58

Send email via Java code 1 (58), java code send email 58

Email protocol:

Email: SMTP (Simple Mail Transport Protocal)

Email receiving protocol: pop3 (Post Office Protocal 3)

IMAP can also receive emails by sending emails with the new protocol.

(Step-by-step interaction with servers)

SMTP:

Ehlo <space> <your domain name> <press enter> Ehlo-Server

Auth <SP> Login <CRLF> Login Request

Mail <SP> From: <reverse-path> <CRLF> Sender email: www@aa.com

Rcpt <SP> To: <forword-path> <CRLF> Recipient address: eee@aa.com

Data <CRLF> The following are data

Quit <CRLF> Exit

Email sending and receiving process:

Generally, smtp and pop3 are two servers (host ).

The Smtp mail port is 25.

POP3 port 110.

Mail example

1 install foxmail:

// Base64 encode the user name and password

@ Test

Public VoidBase64 (){

String name = "wj_leaf12345 ";

String pwd = "1qaz2wsx ";

BASE64Encoder en =NewBASE64Encoder ();

Name = en. encode (name. getBytes ());

Pwd = en. encode (pwd. getBytes ());

System.Err. Println (name );

System.Err. Println (pwd );

}

3. Send emails using java code

To send an email in java, you must import a new package.

Mail. jar-core package for sending emails

Activation. jar-encryption of users and passwords.

There are three core classes in mail. jar:

Javax. mail. Session-refers to the Session with the mail server. You only need one project.

Javax. mail. Message (Interface)-prepare to send data information.

MimeMessage-you can set data types.

Transport-it has a method to send messages.

Step 1: import two jar packages

Step 2: send a simple email

Public VoidSendMail ()ThrowsException {

// Step 1: declare the properties Object Information

Properties prop =NewProperties ();

// Set which server to connect

Prop. setProperty ("mail. host", "smtp.126.com ");

// Set whether to verify

Prop. setProperty ("mail. smtp. auth", "true ");

// Step 2: declare the user name and password

Authenticator auth =NewAuthenticator (){

// This request returns the user and password object

PublicPasswordAuthentication getPasswordAuthentication (){

PasswordAuthentication pa =

NewPasswordAuthentication ("aaa", "sss ");

ReturnPa;

}

};

/// Step 2: Obtain the Session object

Session session =

Session.GetDefaultInstance(Prop, auth );

// Set the session debugging mode

Session. setDebug (True);

// Step 3: declare Information

MimeMessage mm1 =

NewMimeMessage (session );

// Step 4: Set the sender email

Address from =NewInternetAddress ("wj@126.com ");

Mm1.setFrom (from );

// Step 5: Set the recipient

Mm1.setRecipient (RecipientType.TO,NewInternetAddress ("wj@163.com "));

Mm1.setRecipient (RecipientType.CC,NewInternetAddress ("554@qq.com "));

Mm1.setRecipient (RecipientType.BCC,NewInternetAddress ("wj@ss.cn "));

// Step 6: Set the topic

Mm1.setSubject ("this is an email sent in Java 3 ");

Mm1.setContent ("Hello, this is an email sent in java, 3333 try again", "text/plain; charset = UTF-8 ");

// Step 7:

Transport.Send(Mm1 );

}

 

Step 3: send an email with a hyperlink

Mm1.setSubject ("this is an email sent using Java sfasdf3 ");

Mm1.setContent ("Hello, this is an email sent in java, <a href = 'HTTP: // www.baidu.com '> Baidu </a>", "text/html; charset = UTF-8 ");

// Step 7:

Transport.Send(Mm1 );

Step 4: email with a letter

Public VoidSendFile ()ThrowsException {

Properties p =NewProperties ();

P. setProperty ("mail. host", "smtp.163.com ");

P. setProperty ("mail. smtp. auth", "true ");

Session s = Session.GetDefaultInstance(P,NewAuthenticator (){

@ Override

PublicPasswordAuthentication getPasswordAuthentication (){

Return NewPasswordAuthentication ("ww", "123 ");

}

});

S. setDebug (True);

 

// Declare MimeMessage

MimeMessage msg =NewMimeMessage (s );

Msg. setFrom (NewInternetAddress ("ww@163.com "));

Msg. setRecipient (RecipientType.TO,NewInternetAddress ("ww@126.com "));

Msg. setSubject ("image ");

// Step 1: declare the multi-process Part

MimeMultipart mm =NewMimeMultipart ();

// Step 2: declare

MimeBodyPart body1 =NewMimeBodyPart ();

// Step 3: Set the delimiter

DataSource ds =NewFileDataSource (NewFile ("./img/a.jpg "));

DataHandler dh =NewDataHandler (ds );

Body1.setDataHandler (dh );

// The name must be set.

Body1.setFileName (MimeUtility.EncodeText("Beauty .jpg "));

MimeBodyPart body2 =NewMimeBodyPart ();

// Step 3: Set the delimiter

DataSource ds2 =NewFileDataSource (NewFile ("./img/B .jpg "));

DataHandler dh2 =NewDataHandler (ds2 );

Body2.setDataHandler (dh2 );

// The name must be set.

Body2.setFileName (MimeUtility.EncodeText("Beauty 2.jpg "));

MimeBodyPart body3 =NewMimeBodyPart ();

// Step 3: Set the delimiter

DataSource ds3 =NewFileDataSource (NewFile ("./img/mworkflow "));

DataHandler dh3 =NewDataHandler (ds3 );

Body3.setDataHandler (dh3 );

// The name must be set.

Body3.setFileName (MimeUtility.EncodeText("The last century "));

// Add body1 to mm

Mm. addBodyPart (body1 );

Mm. addBodyPart (body2 );

Mm. addBodyPart (body3 );

Msg. setContent (mm );

// Send

Transport.Send(Msg );

}