Introducing Spring Framework

Chapter 13
Adding E-mail and Scheduling Tasks
In this chapter, you are going to incorporate new features into your Spring application. Let’s imagine that you have
some users that like your My Documents application and they want to subscribe to an e-mail to receive the latest
documents that are inserted. Let’s also add some logic that verifies the location of all of the documents (remember
that the location is a physical path where the document’s type is a note or PDF and the location for a book type is a
URL); if the location is wrong or unavailable, the application will alert you to take some action about it.
Let’s start by creating your first e-mail example code.
Sending E-mails
The Spring Framework provides some libraries for sending e-mails in a very easy way. Listing 13-1 is an EmailService
class that just contains a send method. This method will have four parameters: from (the e-mail address where
the e-mail is being sent from), to (the recipient’s e-mail), subject (the e-mail’s subject), and the message
(the e-mail’s message).
Listing 13-1. EmailService.java
package com.apress.isf.spring.email;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mail.MailSender;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.stereotype.Service;
@Service
public class EmailService {
@Autowired
private MailSender mailSender;
public void send(String from, String to, String subject, String message) {
sendEmail(from,to,subject,message);
}
private void sendEmail(String from, String to, String subject, String message){
SimpleMailMessage mailMessage = new SimpleMailMessage();
mailMessage.setFrom(from);
mailMessage.setTo(to);
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