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

Source: Internet
Author: User
Tags base64 encode mail example

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 );

}


 

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.