电子邮件

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;
	}

	@Override
	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());
		}
	}

}

class SimpleOrderManager : OrderManager {

	lateinit var mailSender: MailSender
	lateinit var templateMessage: SimpleMailMessage

	override fun 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

		val msg = SimpleMailMessage(this.templateMessage)
		msg.setTo(order.customer.emailAddress)
		msg.text = ("Dear " + order.customer.firstName
				+ order.customer.lastName
				+ ", thank you for placing order. Your order number is "
				+ order.orderNumber)
		try {
			mailSender.send(msg)
		} catch (ex: MailException) {
			// simply log it and go on...
			System.err.println(ex.message)
		}
	}
}

@Bean
JavaMailSender mailSender() {
	JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
	mailSender.setHost("mail.mycompany.example");
	return mailSender;
}

@Bean // this is a template message that we can pre-load with default state
SimpleMailMessage templateMessage() {
	SimpleMailMessage message = new SimpleMailMessage();
	message.setFrom("[email protected]");
	message.setSubject("Your order");
	return message;
}

@Bean
SimpleOrderManager orderManager(JavaMailSender mailSender, SimpleMailMessage templateMessage) {
	SimpleOrderManager orderManager = new SimpleOrderManager();
	orderManager.setMailSender(mailSender);
	orderManager.setTemplateMessage(templateMessage);
	return orderManager;
}

@Bean
fun mailSender(): JavaMailSender {
	return JavaMailSenderImpl().apply {
		host = "mail.mycompany.example"
	}
}

@Bean // this is a template message that we can pre-load with default state
fun templateMessage() = SimpleMailMessage().apply {
	from = "[email protected]"
	subject = "Your order"
}


@Bean
fun orderManager(javaMailSender: JavaMailSender, simpleTemplateMessage: SimpleMailMessage) = SimpleOrderManager().apply {
	mailSender = javaMailSender
	templateMessage = simpleTemplateMessage
}

<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
	<property name="host" value="mail.mycompany.example"/>
</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="[email protected]"/>
	<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>