JavaMail API 傳送一個HTML電子郵件

下面是一個例子，從你的機器傳送HTML格式電子郵件。這裡通過使用JangoSMPT伺服器的郵件傳送到我們的目標電子郵件地址。

這個例子非常相似，傳送簡單的電子郵件，除非，這裡我們使用的是使用setContent()方法來設定內容的第二個引數為“"text/html"指定的HTML內容被包含在訊息中。通過這個例子，你可以傳送喜歡HTML內容。

傳送包含HTML內容的電子郵件，遵循的步驟是：

• 獲得一個Session

• 建立一個預設的MimeMessage物件，並設定發件人，收件人，主題（From, To, Subject）在訊息中。

• 設定使用使用setContent（實際的訊息），如下方法：

  message.setContent("<h1>This is actual message embedded in 
     HTML tags</h1>", "text/html");

• 傳送使用傳輸物件的訊息。

建立Java類

建立一個Java類檔案SendHTMLEmail，是其內容如下：

package com.yiibai;

import java.util.Properties;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class SendHTMLEmail {
   public static void main(String[] args) {
      // Recipient's email ID needs to be mentioned.
      String to = "[email protected]";

      // Sender's email ID needs to be mentioned
      String from = "[email protected]";
      final String username = "manishaspatil";//change accordingly
      final String password = "******";//change accordingly

      // Assuming you are sending email through relay.jangosmtp.net
      String host = "relay.jangosmtp.net";

      Properties props = new Properties();
      props.put("mail.smtp.auth", "true");
      props.put("mail.smtp.starttls.enable", "true");
      props.put("mail.smtp.host", host);
      props.put("mail.smtp.port", "25");

      // Get the Session object.
      Session session = Session.getInstance(props,
         new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
               return new PasswordAuthentication(username, password);
            }
	});

      try {
            // Create a default MimeMessage object.
            Message message = new MimeMessage(session);

   	   // Set From: header field of the header.
	   message.setFrom(new InternetAddress(from));

	   // Set To: header field of the header.
	   message.setRecipients(Message.RecipientType.TO,
              InternetAddress.parse(to));

	   // Set Subject: header field
	   message.setSubject("Testing Subject");

	   // Send the actual HTML message, as big as you like
	   message.setContent(
              "<h1>This is actual message embedded in HTML tags</h1>",
             "text/html");

	   // Send message
	   Transport.send(message);

	   System.out.println("Sent message successfully....");

      } catch (MessagingException e) {
	   e.printStackTrace();
	   throw new RuntimeException(e);
      }
   }
}

由於我們使用的是由主機提供商JangoSMTP提供 SMTP伺服器，我們需要驗證使用者名和密碼。javax.mail.PasswordAuthentication類用於驗證的密碼。

編譯並執行

Now that our class is ready, let us compile the above class. I've saved the class SendHTMLEmail.java to directory : /home/manisha/JavaMailAPIExercise. We would need the jars javax.mail.jar andactivation.jar in the classpath. Execute the command below to compile the class (both the jars are placed in /home/manisha/ directory) from command prompt:

javac -cp /home/manisha/activation.jar:/home/manisha/javax.mail.jar: SendHTMLEmail.java

Now that the class is compiled, execute the below command to run:

java -cp /home/manisha/activation.jar:/home/manisha/javax.mail.jar: SendHTMLEmail

Verify Output

You should see the following message on the command console:

Sent message successfully....

As I'm sending an email to my gmail address through JangoSMTP, the following mail would be received in my gmail account inbox: