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22.2.?使用Spring郵件抽象

假設(shè)某個(gè)業(yè)務(wù)接口名為OrderManager:

public interface OrderManager {

    void placeOrder(Order order);
}

我們同時(shí)假設(shè)有一個(gè)用例：需要生成帶有訂單號(hào)的email信件, 并向客戶發(fā)送該訂單。

22.2.1.?`MailSender` 和 `SimpleMailMessage` 的基本用法

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());            
        }
    }
}

上面的代碼的bean定義應(yīng)該是這樣的:

<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>

22.2.2.?使用 `JavaMailSender` 和 `MimeMessagePreparator`

下面是OrderManager的另一種實(shí)現(xiàn), 使用了MimeMessagePreparator回調(diào)接口。請(qǐng)注意在這個(gè)用例中，mailSender屬性是JavaMailSender類型，所以我們可以使用JavaMail的MimeMessage類：

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

import javax.mail.internet.MimeMessage;
import org.springframework.mail.MailException;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessagePreparator;

public class SimpleOrderManager implements OrderManager {

    private JavaMailSender mailSender;
    
    public void setMailSender(JavaMailSender mailSender) {
        this.mailSender = mailSender;
    }

    public void placeOrder(final Order order) {

        // Do the business calculations...

        // Call the collaborators to persist the order...
        
        MimeMessagePreparator preparator = new MimeMessagePreparator() {
        
            public void prepare(MimeMessage mimeMessage) throws Exception {
        
                mimeMessage.setRecipient(Message.RecipientType.TO, 
                        new InternetAddress(order.getCustomer().getEmailAddress()));
                mimeMessage.setFrom(new InternetAddress("mail@mycompany.com"));
                mimeMessage.setText(
                    "Dear " + order.getCustomer().getFirstName() + " "
                        + order.getCustomer().getLastName()
                        + ", thank you for placing order. Your order number is "
                        + order.getOrderNumber());
            }
        };
        try {
            this.mailSender.send(preparator);
        }
        catch (MailException ex) {
            // simply log it and go on...
            System.err.println(ex.getMessage());            
        }
    }
}

注意

以上的郵件代碼是一個(gè)橫切關(guān)注點(diǎn)，能被完美地重構(gòu)為自定義Spring AOP切面的候選者，這樣它就可以在目標(biāo)對(duì)象OrderManager的一些合適的連接點(diǎn)（joinpoint）中被執(zhí)行了。

Spring Framework的郵件支持直接提供兩種MailSender的實(shí)現(xiàn)。標(biāo)準(zhǔn)的JavaMail實(shí)現(xiàn)和基于Jason Hunter編寫的MailMessage類之上的實(shí)現(xiàn)，后者位于 com.oreilly.servlet包中。請(qǐng)查閱相關(guān)Javadocs以獲得進(jìn)一步的資料。

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22.2.?使用Spring郵件抽象

22.2.1.?MailSender 和 SimpleMailMessage 的基本用法

22.2.2.?使用 JavaMailSender 和 MimeMessagePreparator

注意

22.2.1.?`MailSender` 和 `SimpleMailMessage` 的基本用法

22.2.2.?使用 `JavaMailSender` 和 `MimeMessagePreparator`