added mailing class

src/main/java/com/commafeed/backend/services/MailService.java

@@ -0,0 +1,53 @@
+package com.commafeed.backend.services;
+
+import java.util.Properties;
+
+import javax.inject.Inject;
+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;
+
+import com.commafeed.backend.model.ApplicationSettings;
+import com.commafeed.backend.model.User;
+
+public class MailService {
+
+	@Inject
+	ApplicationSettingsService applicationSettingsService;
+
+	public void sendMail(User user, String subject, String content) throws Exception {
+
+		ApplicationSettings settings = applicationSettingsService.get();
+		
+		final String username = settings.getSmtpUserName();
+		final String password = settings.getSmtpPassword();
+		
+		String dest = user.getEmail();
+
+		Properties props = new Properties();
+		props.put("mail.smtp.auth", "true");
+		props.put("mail.smtp.starttls.enable", settings.isSmtpTls());
+		props.put("mail.smtp.host", settings.getSmtpHost());
+		props.put("mail.smtp.port", settings.getSmtpPort());
+
+		Session session = Session.getInstance(props,
+				new javax.mail.Authenticator() {
+					protected PasswordAuthentication getPasswordAuthentication() {
+						return new PasswordAuthentication(username, password);
+					}
+				});
+
+		Message message = new MimeMessage(session);
+		message.setFrom(new InternetAddress(username, "CommaFeed"));
+		message.setRecipients(Message.RecipientType.TO,
+				InternetAddress.parse(dest));
+		message.setSubject("CommaFeed - " + subject);
+		message.setText(content);
+
+		Transport.send(message);
+
+	}
+}