用 Java 发送电子邮件

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;

//Main Class
public class FirstProgram {
    public static void main(String[] args) {
        //Turn off Two Factor Authentication
        //Turn off less secure app
        final String sender = "Write Yor Email Address"; // The sender email
        final String urpass = "The Password of your email here"; //keep it secure
        Properties set = new Properties();
        //Set values to the property
        set.put("mail.smtp.starttls.enable", "true");
        set.put("mail.smtp.auth", "true");
        set.put("mail.smtp.host", "smtp.gmail.com");
        set.put("mail.smtp.port", "587");
        Session session = Session.getInstance(set,new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(sender, urpass);
        }});

        try {
            //email extends Java's Message Class, check out javax.mail.Message class to read more
            Message email = new MimeMessage(session);
            email.setFrom(new InternetAddress("senderEmail")); //sender email address here
            email.setRecipients(Message.RecipientType.TO,
            InternetAddress.parse("receiverEmail")); //Receiver email address here
            email.setSubject("I am learning how to send emails using java"); //Email Subject and message
            email.setText("Hi, have a nice day! ");
            Transport.send(email);
            System.out.println("Your email has successfully been sent!");
        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }
}

Your email has successfully been sent!

import java.util.Date;
import java.util.Properties;
import javax.mail.Authenticator;
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 SendEmailUsingJavaOutlook {
    //Define contstant strings and set properties of the email
    final String SERVIDOR_SMTP = "smtp.office365.com";
    final int PORTA_SERVIDOR_SMTP = 587;
    final String CONTA_PADRAO = "sender email here";
    final String SENHA_CONTA_PADRAO = "sender password";
    final String sender = "Write your email again";
    final String recvr = "Whom do you want to send?";
    final String emailsubject = "Subject of the email";
    //Note: you can use the date function just like these strings
    final String msg = "Hi! I am sending this email from a java program.";

    public void Email() {
        //Set the session of email
        final Session newsession = Session.getInstance(this.Eprop(), new Authenticator() {
            @Override
            //password authenication
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(CONTA_PADRAO, SENHA_CONTA_PADRAO);
            }
        });
        //MimeMessage to take user input
        try {
            final Message newmes = new MimeMessage(newsession);
            newmes.setRecipient(Message.RecipientType.TO, new InternetAddress(recvr));
            newmes.setFrom(new InternetAddress(sender));
            newmes.setSubject(emailsubject); //Takes email subject
            newmes.setText(msg); // The main message of email
            newmes.setSentDate(new Date()); //You can set the date of the email here
            Transport.send(newmes);// Transfort the email
            System.out.println("Email sent!");
        } catch (final MessagingException ex) { //exception to catch the errors
            System.out.println("try hard!"); //failed
        }
    }
    //The permenant set of prperties containg string keys, the following configuration enables the SMPTs to function
    public Properties Eprop() {
        final Properties config = new Properties();
        config.put("mail.smtp.auth", "true");
        config.put("mail.smtp.starttls.enable", "true");
        config.put("mail.smtp.host", SERVIDOR_SMTP);
        config.put("mail.smtp.port", PORTA_SERVIDOR_SMTP);
        return config;
    }
    public static void main(final String[] args) {
        new SendEmailUsingJavaOutlook().Email();
    }
}

Email sent!

import org.apache.commons.mail.DefaultAuthenticator;
import org.apache.commons.mail.Email;
import org.apache.commons.mail.EmailException;
import org.apache.commons.mail.SimpleEmail;

public class SendMailWithApacheCommonsJava {
    @SuppressWarnings("deprecation")
    public static void main(String[] args) throws EmailException {
        Email sendemail = new SimpleEmail();
        sendemail.setSmtpPort(587);
        sendemail.setAuthenticator(new DefaultAuthenticator("uremail","urpassword"));//password and email
        sendemail.setDebug(false);
        sendemail.setHostName("smtp.gmail.com");
        sendemail.setFrom("uremail");
        sendemail.setSubject("The subject of your email");
        sendemail.setMsg("Your email Message"); Your Email Address
        sendemail.addTo("receivermail"); // Receiver Email Address
        sendemail.setTLS(true);
        sendemail.send(); //sending email
        System.out.println("You have sent the email using Apache Commons Mailing API");
    }
}

You have sent the email using Apache Commons Mailing API