How do I send an e-mail in Java?

Question

I need to send e-mails from a servlet running within Tomcat. I\'ll always send to the same recipient with the same subject, but with different contents.

What\'s a sim

Answer 1

Here is the simple Solution

Download these jars: 1. Javamail 2. smtp 3. Java.mail

Copy and paste the below code from [http://javapapers.com/core-java/java-email/][1]

Edit the ToEmail, Username and Password (Gmail User ID and Pwd)

Answer 2

import java.util.Properties;

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



public class sendMail {

    static  String  alertByEmail(String emailMessage){
        try{
                     
            final String fromEmail = "abc@gmail.com";
            final String password = "********"; //fromEmail password 
            final String toEmail = "xyz@gmail.com";
            System.out.println("Email configuration code start");
            Properties props = new Properties();
            props.put("mail.smtp.host", "smtp.gmail.com"); //SMTP Host set by default this
            props.put("mail.smtp.port", "587"); //TLS Port you can use 465 insted of 587
            props.put("mail.smtp.auth", "true"); //enable authentication
            props.put("mail.smtp.starttls.enable", "true"); //enable STARTTLS
            //create Authenticator object to pass in Session.getInstance argument
            Authenticator auth = new Authenticator() 
            {
            
                protected PasswordAuthentication getPasswordAuthentication() 
                {
                        return new PasswordAuthentication(fromEmail, password);
                }
            };
                        Session session = Session.getInstance(props, auth);
            
                        MimeMessage message = new MimeMessage(session);
                        message.setFrom(new InternetAddress(fromEmail));
                        message.addRecipient(Message.RecipientType.TO, new 
                                                              InternetAddress(toEmail));
                        message.setSubject("ALERT");
                        message.setText(emailMessage);//here you can write a msg what you want to send... just remove String parameter in alertByEmail method oherwise call parameter
                        System.out.println("text:"+emailMessage);
                        Transport.send(message);//here mail sending process start.
                        System.out.println("Mail Sent Successfully");
        }
        catch(Exception ex)
        {
                        System.out.println("Mail fail");
                        System.out.println(ex);
        }
        return emailMessage;
        
        }
public static void main(String[] args) {
    String emailMessage = "This mail is send using java code.Report as a spam";
    alertByEmail(emailMessage);
    }
}











https://github.com/sumitfadale/java-important-codes/blob/main/Send%20a%20mail%20through%20java 


enter code here

Answer 3

Add java.mail jar into your class path if it is non maven project Add the below dependency into your pom.xml execute the code

 <dependency>
        <groupId>javax.mail</groupId>
        <artifactId>mail</artifactId>
        <version>1.4</version>
    </dependency>

Below is the tested code

import java.util.Date;
    import java.util.Properties;

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

    public class MailSendingDemo {
        static Properties properties = new Properties();
        static {
            properties.put("mail.smtp.host", "smtp.gmail.com");
            properties.put("mail.smtp.port", "587");
            properties.put("mail.smtp.auth", "true");
            properties.put("mail.smtp.starttls.enable", "true");
        }
        public static void main(String[] args) {
            String returnStatement = null;
            try {
                Authenticator auth = new Authenticator() {
                    public PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication("yourEmailId", "password");
                    }
                };
                Session session = Session.getInstance(properties, auth);
                Message message = new MimeMessage(session);
                message.setFrom(new InternetAddress("yourEmailId"));            
                message.setRecipient(Message.RecipientType.TO, new InternetAddress("recepeientMailId"));
                message.setSentDate(new Date());
                message.setSubject("Test Mail");
                message.setText("Hi");
                returnStatement = "The e-mail was sent successfully";
                System.out.println(returnStatement);    
                Transport.send(message);
            } catch (Exception e) {
                returnStatement = "error in sending mail";
                e.printStackTrace();
            }
        }
    }

Answer 4

JavaMail can be a bit of a pain to use. If you want a simpler, cleaner, solution then have a look at the Spring wrapper for JavaMail. The reference docs are here:

http://static.springframework.org/spring/docs/2.5.x/reference/mail.html

However, this does mean you need Spring in your application, if that isn't an option then you could look at another opensource wrapper such as simple-java-mail:

simplejavamail.org

Alternatively, you can use JavaMail directly, but the two solutions above are easier and cleaner ways to send email in Java.

Answer 5

JavaMail is great if you can rely on an outside SMTP server. If, however, you have to be your own SMTP server, then take a look at Asprin.

Answer 6

I usually define my javamail session in the GlobalNamingResources section of tomcat's server.xml file so that my code does not depend on the configuration parameters:

<GlobalNamingResources>
    <Resource name="mail/Mail" auth="Container" type="javax.mail.Session"
              mail.smtp.host="localhost"/>
    ...
</GlobalNamingResources>

and I get the session via JNDI:

    Context context = new InitialContext();
    Session sess = (Session) context.lookup("java:comp/env/mail/Mail");

    MimeMessage message = new MimeMessage(sess);
    message.setFrom(new InternetAddress(from));
    message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
    message.setSubject(subject, "UTF-8");
    message.setText(content, "UTF-8");
    Transport.send(message);