public interface OrderManager {

​

    void placeOrder(Order order);

}

// of course you would use DI in any real-world cases

JavaMailSenderImpl sender = new JavaMailSenderImpl();

sender.setHost("mail.host.com");

​

MimeMessage message = sender.createMimeMessage();

MimeMessageHelper helper = new MimeMessageHelper(message);

helper.setTo("test@host.com");

helper.setText("Thank you for ordering!");

​

sender.send(message);

<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">

  <property name="host" value="mail.mycompany.com"/>

</bean>

​

<!-- this is a template message that we can pre-load with default state -->

<bean id="templateMessage" class="org.springframework.mail.SimpleMailMessage">

  <property name="from" value="customerservice@mycompany.com"/>

  <property name="subject" value="Your order"/>

</bean>

​

<bean id="orderManager" class="com.mycompany.businessapp.support.SimpleOrderManager">

  <property name="mailSender" ref="mailSender"/>

  <property name="templateMessage" ref="templateMessage"/>

</bean>

import org.springframework.mail.MailException;

import org.springframework.mail.MailSender;

import org.springframework.mail.SimpleMailMessage;

​

public class SimpleOrderManager implements OrderManager {

​

    private MailSender mailSender;

    private SimpleMailMessage templateMessage;

​

    public void setMailSender(MailSender mailSender) {

        this.mailSender = mailSender;

    }

​

    public void setTemplateMessage(SimpleMailMessage templateMessage) {

        this.templateMessage = templateMessage;

    }

​

    public void placeOrder(Order order) {

​

        // Do the business calculations...

​

        // Call the collaborators to persist the order...

​

        // Create a thread safe "copy" of the template message and customize it

        SimpleMailMessage msg = new SimpleMailMessage(this.templateMessage);

        msg.setTo(order.getCustomer().getEmailAddress());

        msg.setText(

            "Dear " + order.getCustomer().getFirstName()

                + order.getCustomer().getLastName()

                + ", thank you for placing order. Your order number is "

                + order.getOrderNumber());

        try{

            this.mailSender.send(msg);

        }

        catch(MailException ex) {

            // simply log it and go on...

            System.err.println(ex.getMessage());

        }

    }

}