Spring email 發送郵件

Spring提供了一个发送电子邮件的高级抽象层，它向用户屏蔽了底层邮件系统的一些细节，同时负责低层次的代表客户端的资源处理。

Spring邮件抽象结构
Spring邮件抽象层的主要包为org.springframework.mail。它包括了发送电子邮件的主要接口MailSender和 封装了简单邮件的属性如from, to,cc, subject, text的值对象叫做SimpleMailMessage。 一个以MailException为root的checked Exception继承树，它们提供了对底层邮件系统异常的高级别抽象。 请参考JavaDocs来得到关于邮件异常层次的更多的信息。

为了使用JavaMail中的一些特色如MIME类型的消息,Spring也提供了一个MailSender的子接口, 名为org.springframework.mail.javamail.JavaMailSender，同时也提供了一个对JavaMail的MIME类型的消息分块的回调interface， 名为org.springframework.mail.javamail.MimeMessagePreparator MailSender:
public interface MailSender {
/**
* Send the given simple mail message.
* @param simpleMessage message to send
* @throws MailException in case of message, authentication, or send errors
*/
public void send(SimpleMailMessage simpleMessage) throws MailException;
/**
* Send the given array of simple mail messages in batch.
* @param simpleMessages messages to send
* @throws MailException in case of message, authentication, or send errors
*/
public void send(SimpleMailMessage[] simpleMessages) throws MailException;
}
JavaMailSender:
public interface JavaMailSender extends MailSender {
/**
* Create a new JavaMail MimeMessage for the underlying JavaMail Session
* of this sender. Needs to be called to create MimeMessage instances
* that can be prepared by the client and passed to send(MimeMessage).
* @return the new MimeMessage instance
* @see #send(MimeMessage)
* @see #send(MimeMessage[])
*/
public MimeMessage createMimeMessage();
/**
* Send the given JavaMail MIME message.
* The message needs to have been created with createMimeMessage.
* @param mimeMessage message to send
* @throws MailException in case of message, authentication, or send errors
* @see #createMimeMessage
*/
public void send(MimeMessage mimeMessage) throws MailException;
/**
* Send the given array of JavaMail MIME messages in batch.
* The messages need to have been created with createMimeMessage.
* @param mimeMessages messages to send
* @throws MailException in case of message, authentication, or send errors
* @see #createMimeMessage
*/
public void send(MimeMessage[] mimeMessages) throws MailException;
/**
* Send the JavaMail MIME message prepared by the given MimeMessagePreparator.
* Alternative way to prepare MimeMessage instances, instead of createMimeMessage
* and send(MimeMessage) calls. Takes care of proper exception conversion.
* @param mimeMessagePreparator the preparator to use
* @throws MailException in case of message, authentication, or send errors
*/
public void send(MimeMessagePreparator mimeMessagePreparator) throws MailException;
/**
* Send the JavaMail MIME messages prepared by the given MimeMessagePreparators.
* Alternative way to prepare MimeMessage instances, instead of createMimeMessage
* and send(MimeMessage[]) calls. Takes care of proper exception conversion.
* @param mimeMessagePreparators the preparator to use
* @throws MailException in case of message, authentication, or send errors
*/
public void send(MimeMessagePreparator[] mimeMessagePreparators) throws MailException;
}
MimeMessagePreparator:
public interface MimeMessagePreparator {
/**
* Prepare the given new MimeMessage instance.
* @param mimeMessage the message to prepare
* @throws MessagingException passing any exceptions thrown by MimeMessage
* methods through for automatic conversion to the MailException hierarchy
*/
void prepare(MimeMessage mimeMessage) throws MessagingException;
}

使用Spring邮件抽象
让我们来假设有一个业务接口名为OrderManager public interface OrderManager {
void placeOrder(Order order);
}
同时有一个use case为：需要生成带有订单号的email信息,并向客户发送该订单。 为了这个目的我们会使用MailSender和SimpleMailMessage。

请注意,通常情况下,我们在业务代码中使用接口而让Spring ioc容器负责组装我们需要的合作者。

 

代码以及 配置看源代码：