com.bia.monitor.service.EmailService.java Source code

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Here is the source code for com.bia.monitor.service.EmailService.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.monitor.service;

/**
 *
 * @author Intesar Mohammed mdshannan@gmail.com
 */
import java.util.Properties;
import javax.annotation.PreDestroy;
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;
import org.apache.log4j.Logger;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

@Service
public class EmailService {

    protected static Logger logger = Logger.getLogger(EmailService.class);
    // just set the username / password
    // example@gmail.com or example@zytoon.me
    private String USERNAME = "team@zytoon.me";
    private String PASSWORD = "Teamu123$";
    private String EMAIL_CONTENT_TYPE = "text/html";
    private String SMTP_HOST_NAME = "smtp.gmail.com";
    private String SMTP_PORT = "465";
    private String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";

    public EmailService() {
    }

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

    //    private static final EmailService instance = new EmailService();
    //    public static EmailService getInstance() {
    //        return instance;
    //    }

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

        String[] to = { toAddress };
        sendSSMessage(to, subject, body);
        return true;
    }

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

        sendSSMessage(toAddresses, subject, body);
        return true;

    }

    /**
     * validates email/emails 
     * @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 cannot be empty
     * @return 
     */
    private boolean isValidSubject(String subject) {
        return !GenericValidator.isBlankOrNull(subject);
    }

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

        if (session != null) {
            return session;
        }
        boolean debug = false;

        Properties props = new Properties();
        props.put("mail.smtp.host", SMTP_HOST_NAME);
        props.put("mail.smtp.auth", "true");
        props.put("mail.debug", "false");
        props.put("mail.smtp.port", SMTP_PORT);
        props.put("mail.smtp.socketFactory.port", SMTP_PORT);
        props.put("mail.smtp.socketFactory.class", SSL_FACTORY);
        props.put("mail.smtp.socketFactory.fallback", "false");
        session = Session.getDefaultInstance(props, new javax.mail.Authenticator() {

            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(USERNAME, PASSWORD); // todo add password before deploy
            }
        });

        session.setDebug(debug);
        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[2];
        bcc[0] = new InternetAddress("mdshannan@gmail.com");
        bcc[1] = new InternetAddress("atefahmed@gmail.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("Error sending email, please check to and from emails are correct!");
        }
    }

    /**
     *
     * @param addressTo
     * @param subject
     * @param message
     * @throws AddressException
     * @throws MessagingException
     */
    private void send(InternetAddress[] addressTo, String subject, String message)
            throws AddressException, MessagingException {
        logger.info("sending email.. " + addressTo);
        Message msg = new MimeMessage(createSession());
        InternetAddress addressFrom = new InternetAddress(USERNAME);
        msg.setFrom(addressFrom);
        msg.setRecipients(Message.RecipientType.TO, addressTo);

        // set bcc
        InternetAddress[] bcc1 = getBCC();
        msg.setRecipients(Message.RecipientType.BCC, bcc1);

        // Setting the Subject and Content Type
        msg.setSubject(subject);
        //String message = comment;
        msg.setContent(message, EMAIL_CONTENT_TYPE);

        Transport.send(msg);
    }

    /**
     *
     * @throws Throwable
     */
    @Override
    protected void finalize() throws Throwable {
        try {
            // releasing executor
            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
     */
    @PreDestroy
    public void shutdown() {
    }
}