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In this chapter, you have seen how the Spring Security framework allows access control to be injected into a web application. You have seen how paths can be protected, how user information can be acquired from the security framework, and how the service layer can be protected independently of the URLs that are used to invoke it. In the next chapter, you will take a look at how e-mail can be created in response to events within the application. You will also learn about the creation of MIME messages containing rich content.
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otifying the user of changes in the application environment is a common requirement for applications of all types, but is especially useful in web applications when processes may need to happen asynchronously and you cannot necessarily demand the user s attention for the duration of the operation. Sometimes the notification will be generated as the result of a completely different user s action, and that is the situation I have chosen to model in the timesheet application: the administrative user will be notified when a user updates a timesheet. For the sake of simplicity my example assumes that the administrator will be notified of updates only, and that the only information needed is the account name of the user making the change. However, this example covers all of the basic techniques that are required for more-sophisticated solutions: populating the message dynamically with information from the application, formatting it, and sending it. By using a DAO implementation honoring an interface, we allow the specific mechanism used for e-mail to be changed without affecting the rest of the application. I take advantage of this throughout this chapter in order to substitute three implementations of the DAO by using different formatting mechanisms. Listing 8-1 shows the interface that these DAOs must implement. The sole method takes a timesheet entity as its parameter, and it is from this that data will be drawn to populate the e-mail content with the user account details.
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Listing 8-1. Our Basic E-mail DAO Interface
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public interface EmailDao { void sendTimesheetUpdate(Timesheet timesheet); } You looked at the usage of the e-mail DAO very briefly in 5, when we were considering the use of the service layer to group related calls to various DAOs. Listing 8-2 shows the injection of the e-mail DAO implementation into the service class that will use it.
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CHAPTER 8 SE NDING E-MAIL
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Listing 8-2. The Timesheet Service Bean Configuration
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<bean id="timesheetService" class="com.apress.timesheets.service.TimesheetServiceImpl"> <property name="timesheetDao" ref="timesheetDao"/> <property name="emailDao" ref="simpleEmailDao"/> </bean> Because the service layer is the common point of contact to the business functionality of our application, we can be confident that any user operation to update the timesheet must pass through the service layer, and so invoke the mechanism to send e-mail as appropriate.
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Spring provides two interfaces for sending e-mail. The first and simplest of these is the MailSender shown in Listing 8-3. This accepts an instance of the SimpleMailMessage class (which is itself, in turn, an implementation of the Spring MailMessage class). With a suitable implementation of the interface available, sending a message is a matter of constructing a SimpleMailMessage object to represent the e-mail and calling the send method. The method accepting an array of SimpleMailMessage objects allows for mail to be sent in batches.
Listing 8-3. The Spring MailSender Interface
public interface MailSender { void send(SimpleMailMessage simpleMessage) throws MailException; void send(SimpleMailMessage[] simpleMessages) throws MailException; } The MailSender implementation is appropriate for pure text-based e-mail with no attachments, but for sending e-mail containing HTML markup or attachments, an implementation of the more-sophisticated JavaMailSender is required. Implementations allow for Multipurpose Internet Mail Extensions (MIME) messages to be created that represent the standards for sending e-mails composed of multiple discrete files typically the e-mail text, any inline images, and any attachments associated with the e-mail.
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