Java Send mail example to explain _java

The example of this article explains the detailed process of Java email, for your reference, the specific content as follows

1. Mail Agreement

E-mail: SMTP (Simple Mail transport protocal)

protocol for receiving mail: POP3 (Post Office protocal 3)

IMAP new Protocol Send mail also can receive mail.

(Step-by-Step interaction with the server)

Smtp:

2, the process of sending and receiving mail:

Typically, SMTP and POP3 are two servers (hosts).

SMTP Mail has a port of 25.

The POP3 port is 110.

Example of sending a message

1), Installation Foxmail:

2), to send the mail, the user name and password to Base64 code

 The username and password are base64 encoded

 @Test public

 void base64 () {

  String name = "wj_leaf12345";

  String pwd = "1qaz2wsx";

  Base64encoder en = new Base64encoder ();

  Name = En.encode (Name.getbytes ());

  PWD = En.encode (Pwd.getbytes ());

  SYSTEM.ERR.PRINTLN (name);

  System.err.println (PWD);

 }

3, email via Java code

To send a message in Java, you must import a new package

mail.jar– the core package of outgoing mail

activation.jar– encrypts the user and password.

There are three core classes in Mail.jar:

Javax.mail.session– refers to a session with a mail server. Just one on the whole project.

Javax.mail.Message (interface)-Prepares to send data information.

MimeMessage-You can set the type of data information.

transport– it has a way to send messages.

First step: Import two jar packages

Step two: Send a simple message

public void SendMail () throws exception{//First step: Declare properties object put information properties prop = new properties ();

  Set up which server to connect Prop.setproperty ("Mail.host", "smtp.126.com");

  Sets whether to validate Prop.setproperty ("Mail.smtp.auth", "true"); Step two: Declare user name and password Authenticator auth = new Authenticator () {//This Shantiu returns the user and password object public passwordauthentication Getpass

    Wordauthentication () {passwordauthentication pa = new Passwordauthentication ("AAA", "SSS");

   Return PA;

  }

  };

  Step two: Get Session object Session session = Session.getdefaultinstance (Prop,auth);

  Sets the debug mode Session.setdebug (True) of the session;

  

  Step three: Declare information mimemessage MM1 = new MimeMessage (session);

  Fourth Step: Set Sender email address from = new InternetAddress ("wj@126.com");

  Mm1.setfrom (from);

  Fifth step: Set the recipient mm1.setrecipient (Recipienttype.to,new internetaddress ("wj@163.com"));

  Mm1.setrecipient (recipienttype.cc, New internetaddress ("554@qq.com")); Mm1.setrecipient (RECIPIENTTYPE.BCC, New InterNetaddress ("wj@ss.cn"));

  Step Sixth: Set the theme Mm1.setsubject ("This is the message 3 in Java");

  Mm1.setcontent ("Hello, this is sent in Java Mail, 3333 try again", "text/plain;charset=utf-8");

 Seventh Step: Transport.send (MM1);

 

 }

Step three: V send a message with a hyperlink

Mm1.setsubject ("This is a mail sfasdf3 with Java");

  Mm1.setcontent ("Hello, this is a mail sent in Java, <a href= ' http://www.baidu.com ' > Baidu </a>", "Text/html;charset=utf-8");

  Seventh Step:

  transport.send (MM1);

Step Fourth: Message for a character piece

public void SendFile () throws exception{Properties P = new properties ();

  P.setproperty ("Mail.host", "smtp.163.com");

  P.setproperty ("Mail.smtp.auth", "true"); Session s = session.getdefaultinstance (P,new authenticator () {@Override public passwordauthentication GetPassword

   Authentication () {return new passwordauthentication ("ww", "123");

  }

  });

 

  S.setdebug (TRUE);

  Statement MimeMessage mimemessage msg = new MimeMessage (s);

  Msg.setfrom (New InternetAddress ("ww@163.com"));

  Msg.setrecipient (recipienttype.to, New internetaddress ("ww@126.com"));

  

  Msg.setsubject ("Picture's");

  First step: Declare the part mimemultipart mm = new Mimemultipart ();

  Step two: Declare mimebodypart body1 = new MimeBodyPart ();

  Step three: Set DataSource ds = new Filedatasource (New File ("./img/a.jpg"));

  DataHandler dh = new DataHandler (DS);

  Body1.setdatahandler (DH);

  You must set the name Body1.setfilename (Mimeutility.encodetext ("Belle. jpg"));

  MimeBodyPart body2 = new MimeBodyPart (); //Step Three: Set DataSource ds2 = new Filedatasource (New File ("./img/b.jpg"));

  DataHandler DH2 = new DataHandler (DS2);

  Body2.setdatahandler (DH2);

  You must set the name Body2.setfilename (Mimeutility.encodetext ("Beauty 2.jpg"));

  MimeBodyPart body3 = new MimeBodyPart ();

  Step three: Set DataSource DS3 = new Filedatasource (New File ("./img/m.mp3"));

  DataHandler dh3 = new DataHandler (DS3);

  Body3.setdatahandler (DH3);

  You must set the name Body3.setfilename (Mimeutility.encodetext ("The end of the century. mp3"));

  Add body1 to mm Mm.addbodypart (body1);

  Mm.addbodypart (BODY2);

  Mm.addbodypart (BODY3);

  

  Msg.setcontent (mm);

 Send Transport.send (msg);
 }

The above is the entire content of this article, I hope to help you learn.