com.bia.yahoomailjava.YahooMailService.java Source code

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Here is the source code for com.bia.yahoomailjava.YahooMailService.java

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/*
 * Copyright 2002-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.bia.yahoomailjava;

import java.util.Properties;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import javax.mail.*;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import org.apache.commons.validator.GenericValidator;
import org.apache.commons.validator.routines.EmailValidator;

/**
 *
 * @author intesar mohammed mdshannan@gmail.com
 */
public class YahooMailService {

    // set username/password and get started
    private static final String USERNAME = "<yahoo email>";
    private static final String PASSWORD = "<yahoo password>";
    //private static String EMAIL_CONTENT_TYPE = "text/html";
    //private static Logger logger = Logger.getLogger(YahooMailService.class);
    private static final YahooMailService instance = new YahooMailService();
    private ScheduledThreadPoolExecutor executor;

    private Session session;
    // If require enable it
    private InternetAddress[] bcc;

    private YahooMailService() {
        executor = new ScheduledThreadPoolExecutor(2);
    }

    public static YahooMailService getInstance() {
        return instance;
    }

    /**
     *
     * @param toAddress mandatory
     * @param subject mandatory
     * @param body optional
     * @return true email send, false invalid input
     */
    public boolean sendEmail(String toAddress, String subject, String body) {
        if (!isValidEmail(toAddress) || !isValidSubject(subject)) {
            return false;
        }

        String[] to = { toAddress };
        // Aysnc send email
        Runnable emailServiceAsync = new EmailServiceAsync(to, subject, body);
        executor.schedule(emailServiceAsync, 1, TimeUnit.MILLISECONDS);

        return true;
    }

    /**
     *
     * @param toAddresses mandatory
     * @param subject mandatory
     * @param body optional
     * @return true email send, false invalid input
     */
    public boolean sendEmail(String[] toAddresses, String subject, String body) {
        if (!isValidEmail(toAddresses) || !isValidSubject(subject)) {
            return false;
        }

        // Aysnc send email
        Runnable emailServiceAsync = new EmailServiceAsync(toAddresses, subject, body);
        executor.schedule(emailServiceAsync, 1, TimeUnit.MILLISECONDS);

        return true;

    }

    /**
     *
     * @param emails
     * @return
     */
    private boolean isValidEmail(String... emails) {
        if (emails == null) {
            return false;
        }
        for (String email : emails) {
            if (!EmailValidator.getInstance().isValid(email)) {
                return false;
            }
        }
        return true;
    }

    /**
     *
     * @param subject
     * @return
     */
    private boolean isValidSubject(String subject) {
        return !GenericValidator.isBlankOrNull(subject);
    }

    /*
     *
     * Aysnc send emails using command pattern
     *
     */
    private class EmailServiceAsync implements Runnable {

        String recipients[];
        String subject;
        String message;

        EmailServiceAsync(String recipients[], String subject, String message) {
            this.recipients = recipients;
            this.subject = subject;
            this.message = message;
        }

        public void run() {
            YahooMailService.this.sendSSMessage(recipients, subject, message);
        }
    }

    /**
     * session is created only once
     *
     * @return
     */
    private Session createSession() {

        if (session != null && false) {
            return session;
        }
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.mail.yahoo.com");
        props.put("mail.stmp.user", USERNAME);
        //To use TLS
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.password", PASSWORD);
        session = Session.getDefaultInstance(props, new Authenticator() {

            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(USERNAME, PASSWORD);
            }
        });
        return session;
    }

    /**
     * bcc -- incase you need to be copied on emails
     *
     * @return
     * @throws AddressException
     */
    private InternetAddress[] getBCC() throws AddressException {
        if (bcc != null) {
            return bcc;
        }
        bcc = new InternetAddress[1];
        bcc[0] = new InternetAddress("example@yahoo.com");
        return bcc;
    }

    /**
     *
     * @param recipients
     * @param subject
     * @param message
     * @param from
     * @throws MessagingException
     */
    private void sendSSMessage(String recipients[], String subject, String message) {

        try {

            InternetAddress[] addressTo = new InternetAddress[recipients.length];
            for (int i = 0; i < recipients.length; i++) {
                if (recipients[i] != null && recipients[i].length() > 0) {
                    addressTo[i] = new InternetAddress(recipients[i]);
                }
            }
            send(addressTo, subject, message);

        } catch (Exception ex) {
            //logger.warn(ex.getMessage(), ex);
            throw new RuntimeException(ex);
        }
    }

    /**
     *
     * @param addressTo
     * @param subject
     * @param message
     *
     */
    private void send(InternetAddress[] addressTo, String subject, String message) {
        try {
            MimeMessage msg = new MimeMessage(createSession());
            msg.setFrom(new InternetAddress(USERNAME));
            msg.setRecipients(MimeMessage.RecipientType.TO, addressTo);
            msg.setSubject(subject);
            msg.setText(message);
            Transport.send(msg);
        } catch (Exception ex) {
            //logger.warn(ex.getMessage(), ex);
            throw new RuntimeException(ex);
        }
    }

    /**
     *
     * @throws Throwable
     */
    @Override
    protected void finalize() throws Throwable {
        try {
            // releasing executor
            this.executor.shutdown();
            // logger.trace("EmailService executor released!");
            System.out.println("EmailService exector released!");
        } finally {
            super.finalize();
        }
    }

    /**
     *  call this method from ServletContextListener.contextDestroyed()
     *  This will release all work thread's when your app is undeployed
     */
    public void shutdown() {
        this.executor.shutdown();
    }
}