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will not automatically download offline content. There are various reasons for this that are unimportant to us, because the net result is that we cannot predict how our e-mail will appear to all users. The solution is to include the content within the e-mail itself and to reference it from the HTML. An example of the HTML used to reference an inline image is shown in Listing 8-13 (but note that this technique works for any inline content, not just images). In addition to explicitly referenced inline binary content such as images, we can include unreferenced attachments in our message. The user s mail client will typically make these available for download upon receipt, so if the purpose of your e-mail is purely to transfer a file, the binary should be included as a file, not as inline content. Our example sends the same image in both modes. The code marked in bold in Listing 8-13 is an image tag referencing an image to be included in the message.
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Listing 8-13. A Velocity Macro Containing a URI Referencing Inline Content
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## Sent whenever a timesheet is updated <html> <body> <h3>Timesheet updated</h3> <p>User ${timesheet.consultant.accountName} has updated one of their timesheets.</p> <p>Image attached. Should be equivalent to the following image:</p> <p><img src="cid:inlineImage"/></p> </body> </html> The cid: prefix is a URI representing message content (CID stands for common image descriptor). The inlineImage following this is the identifier we will be using to associate the link with the correct inline content. Naturally, you must select a unique name to identify unique content items. The naming format follows the RFC 1738 URL address specification, but I would recommend that you constrain yourself to simple letters and numbers. Listing 8-14 shows the implementation of our DAO to send the timesheet update with both the HTML content and images.
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Listing 8-14. Our DAO Implementation Supporting Both Attachments and Inline Images
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public class VelocityImageMailDaoImpl extends AbstractMailDaoImpl { private JavaMailSender mailSender; private String velocityMacroPath; private VelocityEngine velocityEngine; private Resource attachment; private Resource image;
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CHAPTER 8 SE NDING E-MAIL
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public void sendTimesheetUpdate(final Timesheet timesheet) { final MimeMessagePreparator preparator = new MimeMessagePreparator() { public void prepare(MimeMessage mimeMessage) throws Exception { final MimeMessageHelper message = new MimeMessageHelper( mimeMessage, true); message.setTo(rcptAddress); message.setSubject(subject); message.setFrom(fromAddress); message.addAttachment(attachment.getFilename(), attachment); final Map<String, Object> model = new HashMap<String, Object>(); model.put("timesheet", timesheet); final String text = VelocityEngineUtils .mergeTemplateIntoString(velocityEngine, velocityMacroPath, model); message.setText(text, true); message.addInline("inlineImage", image); } }; mailSender.send(preparator); } @Required public void setMailSender(final JavaMailSender mailSender) { this.mailSender = mailSender; } @Required public void setVelocityEngine(final VelocityEngine velocityEngine) { this.velocityEngine = velocityEngine; } @Required public void setVelocityMacroPath(final String velocityMacroPath) { this.velocityMacroPath = velocityMacroPath; } @Required public void setAttachment(final Resource attachment) { this.attachment = attachment; }
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@Required public void setImage(final Resource image) { this.image = image; } } Broadly speaking, this code is similar to the example given in Listing 8-10. The differences are in the attachment of the images. First, we add an attachment to the message. This can be done at any point within the prepare method. We then add the message text. Finally, we add an inline image. The ordering of the last two steps is mandatory: the body text that contains URIs referencing inline content must be added to the message before the inline images themselves are added. In Listing 8-14, I have specified the attachment and image properties as accepting a Resource object in preference to file paths. This allows the greatest flexibility in the type of resource definition that can be provided, and so in Listing 8-15 I have specified the properties as paths relative to the classpath.
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Listing 8-15. The Configuration of the Image-Aware DAO Implementation
<bean id="velocityImageEmailDao" class="com.apress.timesheets.mail.VelocityImageMailDaoImpl" parent="abstractEmailDao"> <property name="velocityEngine" ref="velocityEngine"/> <property name="velocityMacroPath" value="velocity/timesheet/attachments.vm"/> <property name="attachment" value="classpath:strawberry.jpg"/> <property name="image" value="classpath:strawberry.jpg"/> </bean>
Note If you have a large number of files, you may want to use an alternative mechanism to add the files to
your outgoing message. A flat directory structure containing the template files and images could be checked at runtime, allowing the images to be attached programmatically with CIDs based on their (necessarily unique) filenames. If generated files (for example, PDFs created by using the view technologies described in 6) are to be attached, the path to the file and a suitable unique identifier can be passed in with the model information.
In this case, as in many others, the use of a classpath-relative resource ensures that the application will be easy to port to other environments and other platforms. The rest of the configuration details in Listing 8-15 are similar to those of the other HTML example in Listing 8-11, except for the specific Velocity macro file to be loaded and the DAO implementation class.
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