Java Mail and Apache Mail sending Mail examples

I. introduction to email

An email is composed of a lot of information, the main information is as follows, other temporarily ignored, such as cc, etc. :

1. Recipient: the recipient's email address, e.g. (link: #)

2. Recipient name: most emails will be displayed, such as "loadfate" (link: #)

3. Sender: the sender's email address

4. Sender's name:

5. Subject: the subject of the email

6. Contents and attachments: main contents of the email

Two, using Java to send mail general steps

A typical project does not have a separate mail server, and usually USES someone else's server.

1. Set up SMTP server: different mail servers have different addresses, for example: smtp.qq.com represents tencent's SMTP server.

2. Authorization: use the account and password of the server to log in the server.

Create a message: create a message that contains all the information, such as sender, recipient, content, etc.

4. Set the attributes of the message: add data to the attributes of the message.

5, send mail: because of different packaging, the way of sending is not consistent.

Java Mail and Apache Mail

Apache Mail is the encapsulation of Java Mail, which is easier to use and has a better sense of logical hierarchy.

To use Java Mail, you only need to import one jar: mail.jar.

When using Apache Mail, you need to import two jars: mail.jar and commons-email-1.3.1.jar.

Four, use Java Mail to send Mail

 public static void main(String[] args) throws Exception {

         final String user = "779554589";

         final String password = "";

         String fromAddress = "779554589@qq.com";

         String toAddress = "loadfate@163.com";

         String subject = " Email test subject ";

         String content = " This is a test email <b> Ha ha </b>";

         //Configuration parameter 

         Properties props = new Properties();

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

         props.setProperty("mail.transport.protocol", "smtp");

         props.setProperty("mail.host", "smtp.qq.com");

         //Method 1: use the transport object to send mail 

         {

             //Generate a session 
 with arguments
             Session session = Session.getInstance(props);

             //Enable debug mode 

             session.setDebug(true);

             //Create a message and set the message 

             Message message = new MimeMessage(session);

             message.setFrom(new InternetAddress(fromAddress));

             message.setSubject(subject);

             message.setText(content);

             //Create a transport 

             Transport transport = session.getTransport();

             //Connect to SMTP server 

             transport.connect(user, password);

             //Send < br / >
             transport.sendMessage(message, new InternetAddress[] { new InternetAddress(toAddress) });

             transport.close();

         }

         //Method 2: use the Transport class static method to send mail 

         {

             //Session is generated to obtain an authorization connection 

             Session session = Session.getInstance(props, new Authenticator() {

                 @Override

                 protected PasswordAuthentication getPasswordAuthentication() {

                     return new PasswordAuthentication(user, password);

                 }

             });

             session.setDebug(true);

             //Create a message and set the message 

             Message message = new MimeMessage(session);

             message.setSubject(subject);

             message.setFrom(new InternetAddress(fromAddress));

             message.setRecipient(RecipientType.TO, new InternetAddress(toAddress));

             message.setContent(content, "text/html;charset=utf-8");

             //Directly, message generates 
 through an authorized Session
             Transport.send(message);

         }

     }

Use Apache Mail to send emails

 public class ApacheMailTest {

     //SMTP server 

     private String hostName = "smtp.qq.com";

     //Account number and password 

     private String userName = "779554589";

     private String password = " It's a secret ";

     //Sender 

     private String fromAddress = "779554589@qq.com";

     //Sender name 

     private String fromName = "loadfate";

     public static void main(String[] args) throws Exception {

         //Addressee and addressee name 

         String toAddress = "loadfate@163.com";

         String toName = "loadfate";

         ApacheMailTest test = new ApacheMailTest();

         //All exceptions are handled for easy browsing 

         test.sendSimpleEmail(toAddress, toName);

         test.sendHtmlEmail(toAddress, toName);

         test.sendMultiPartEmail(toAddress, toName);

         System.out.println(" Send complete ");

     }

     //Send a simple message, like a message 

     public void sendSimpleEmail(String toAddress, String toName) throws Exception {

         SimpleEmail email = new SimpleEmail();

         email.setHostName(hostName);//Set SMTP server 

         email.setAuthentication(userName, password);//Set the authorization information 

         email.setCharset("utf-8");

         email.setFrom(fromAddress, fromName, "utf-8");//Set the sender message 

         email.addTo(toAddress, toName, "utf-8");//Set the recipient information 

         email.setSubject(" The test subject ");//Set the topic 

         email.setMsg(" This is an easy test! ");//Set the message content to 

         email.send();//Send message 

     }

     //Send an email with Html content 

     public void sendHtmlEmail(String toAddress, String toName) throws Exception {

         HtmlEmail email = new HtmlEmail();

         email.setHostName(hostName);

         email.setAuthentication(userName, password);

         email.setCharset("utf-8");

         email.addTo(toAddress, toName, "utf-8");

         email.setFrom(fromAddress, fromName, "utf-8");

         email.setSubject(" This is a html mail ");

         //Set the HTML content so that when you actually use it, you can read the written HTML code from the text 

         email.setHtmlMsg("<div style='width:100px;height:200px;'>a</div>");

         email.send();

     }

     //Send complex emails, including attachments, etc. 

     public void sendMultiPartEmail(String toAddress, String toName) throws Exception {

         MultiPartEmail email = null;

         email = new MultiPartEmail();

         email.setHostName(hostName);

         email.setAuthentication(userName, password);

         email.setCharset("utf-8");

         email.addTo(toAddress, toName, "utf-8");

         email.setFrom(fromAddress, fromName, "utf-8");

         email.setSubject(" This is the email with attachment ");

         email.setMsg("<a href='#'> The test content </a>");

         //Add additional content to the message 

         EmailAttachment attachment = new EmailAttachment();

         attachment.setPath("D:\ mail .txt");//Local file 

         // attachment.setURL(new URL("http://xxx/a.gif"));// The remote file 

         attachment.setDisposition(EmailAttachment.ATTACHMENT);

         attachment.setDescription(" Description information ");

         //Set the attachment to display the name, must be coded, or Chinese will be garbled 

         attachment.setName(MimeUtility.encodeText(" mail .txt"));

         //Add an attachment to the message 

         email.attach(attachment);

         email.send();

     }

 }

 

Sixth, the attachment
Project folder: maildemo

Download address: (link: http://pan.baidu.com/s/1bn1Y6BX)

If you have any questions or Suggestions, please contact me

Document description:

1. Maildemo.zip :maildemo source code

2. Mail.jar: jar package of Java mail

3. Commons-email-1.3.1.jar :Apache Mail jar package