通过 Spring 3 JavaMail 以 MIME 格式 Freemarker 模板创建多部分消息答案

【问题标题】：Create multi-part message in MIME format Freemarker template via Spring 3 JavaMail通过 Spring 3 JavaMail 以 MIME 格式 Freemarker 模板创建多部分消息
【发布时间】：2011-06-02 15:57:47
【问题描述】：

如何创建包含相同内容的文本和 HTML 版本的电子邮件？

当然，我想知道如何设置 freemarker 模板或将要发送的消息的标题。

当我查看 MIME 格式的消息多部分消息的来源时，我每次都会在收件箱中收到这些消息，而这就是其中的内容：

This is a multi-part message in MIME format.

------=_NextPart_000_B10D_01CBAAA8.F29DB300
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

...Text here...

------=_NextPart_000_B10D_01CBAAA8.F29DB300
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<html><body> html code here ... </body></html>

【问题讨论】：

标签： html spring email text mime

【解决方案1】：

使用 Spring 时，您可以：

  String plainText = "MyPleinText";
  String htmlText = "<html><body><h1>MyHTML</h1></body></html>";
  MimeMessage message = this.mailSender.createMimeMessage();
  MimeMessageHelper helper = new MimeMessageHelper(message, true, MAIL_ENCODING);
  helper.setText(plainText,htmlText);

它会完成这项工作。不涉及 Freemarker 的东西。

MailSender 可以是：

  <bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
    <property name="host" value="${smtp.host}" />
    <property name="port" value="${smtp.port}" />
    <property name="defaultEncoding" value="UTF-8" />
  </bean>

【讨论】：

【解决方案2】：

如果您发现任何不一致之处，请告诉我。我必须从非常复杂的对象中提取它，这就是它看起来如此的原因。

//some important imports
import freemarker.template.Template;
import org.springframework.mail.javamail.*;
import org.springframework.context.*;
import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;
import javax.mail.internet.MimeMessage;

private JavaMailSender mailSender;
private MessageSource messageSource;
private ExecutorService executor = Executors.newFixedThreadPool(50);

MimeMessagePreparator preparator = new MimeMessagePreparator() {
    public void prepare(MimeMessage mimeMessage) throws Exception {
        MimeMessageHelper message = new MimeMessageHelper(mimeMessage);

            message.setFrom(from);
            message.setTo(recipient);
            message.setSubject(subject);

            // Now the message body.
            Multipart mp = new MimeMultipart();

            BodyPart textPart = new MimeBodyPart();
            Template textTemplate = freemarkerConfig.getConfiguration().getTemplate(textEmailTemplate); // "/WEB-INF/emailText/*.ftl"
            final StringWriter textWriter = new StringWriter();
            textEmailTemplate.process(modelMap, textWriter);
            textPart.setText(textWriter.toString()); // sets type to "text/plain"


            BodyPart pixPart = new MimeBodyPart();
            Template pixTemplate = freemarkerConfig.getConfiguration().getTemplate(pixEmailTemplate); // "/WEB-INF/emailPix/*.ftl"
            final StringWriter pixWriter = new StringWriter();
            textEmailTemplate.process(modelMap, pixWriter);
            pixPart.setContent(pixWriter.toString(), "text/html");

            // Collect the Parts into the MultiPart
            mp.addBodyPart(textPart);
            mp.addBodyPart(pixPart);
            // Put the MultiPart into the Message
             message.setContent(mp);                  

     }
};

executor.submit(new SendMail(preparator));

class SendMail extends Thread {
    MimeMessagePreparator preparator;

    SendMail(MimeMessagePreparator preparator) {
        this.preparator = preparator;
    }

    public void run() {
        mailSender.send(preparator);
      }
}

【讨论】：