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This chapter introduced you to the power and flexibility that Spring can bring to your Java applications. Spring is a lightweight container that makes it easy to program to interfaces rather than concrete implementations and promotes the use of simple JavaBeans-style objects rather than complex container-managed objects like EJBs. Aspect-oriented programming (AOP) is a new programming technique that complements the more traditional object-oriented programming (OOP) paradigm. AOP allows developers to dynamically add nonbusiness-oriented functionality to objects without polluting the business-related code with secondary requirements like logging or performance monitoring. These secondary requirements can be refactored into their own classes called aspects and reused across multiple objects. Spring supports AOP by allowing aspects to be added to objects through an XML configuration file. Dependency injection (DI) is a method by which objects are not responsible for looking up their own collaborating objects. Instead of using complicated JNDI lookups

Browser sniffing is problematic, though the sort of thing you d get dirty looks for at web design meetups and tech conferences. Among the biggest problems is that there are more browsers on earth than the average web developer knows about, and when doing browser sniffing, it s too easy to write code that leaves some poor saps out in the cold. Also troublesome is that browsers have an incentive to imitate one another in their user-agent strings, thereby diluting the value of the information. For years, Opera (which supports a number of Internet Explorer s proprietary features) masqueraded as Internet Explorer in its user-agent string. Better to do so than to be arbitrarily shut out of a site that would almost certainly work in your browser. Finally, though, the problem with browser sniffing is arguably one of coding philosophy: is it the right question to ask Quite often we need to distinguish between browsers because of their varying levels of support for certain features. The real question, then, is Do you support feature X instead of Which browser are you This debate is oddly complex. It s important because we need to assess what a user s browser is capable of. But before we go further, we ought to make a distinction between capabilities and quirks.

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Capabilities are things that some browsers support and others don t. DOM Level 2 Events is a capability; Firefox supports it, but Internet Explorer does not (as of version 7). DOM Level 3 XPath is a capability; Safari 3 supports it, but Safari 2 does not. Other capabilities are supported by all modern browsers, so we take them for granted. All modern browsers support document.getElementById (part of DOM Level 1 Core), but once upon a time this wasn t true. Nowadays only the most paranoid of DOM scripters tests for this function before using it. Capabilities are not specific to browsers. They re nearly always supported by specifications (from the W3C or the WHATWG, for instance) and will presumably be supported by all browsers eventually. To write code that relies on capabilities, then, you ought to be singularly concerned with the features a browser claims to support, not the browser s name. Since functions are objects in JavaScript, we can test for their presence in a conditional:

or even using the new keyword to create a new collaborating object, an object can simply expose JavaBeans-style getter and setter methods for collaborating objects. An object relying on DI is easy to unit-test outside of any type of container because it doesn t rely on the JNDI services provided by the container. Spring provides DI functionality through XML configuration files. An object s collaborators can be specified via XML, and Spring will automatically inject the collaborators into the target object. DWR, which we explored in depth in 4, provides seamless integration with Spring beans. By simply specifying the correct bean in the dwr.xml file, DWR allows a Spring bean to be accessed directly from client-side JavaScript. By doing so, Ajax requests via DWR can take advantage of all of Spring s features like AOP and DI. In this chapter you saw how DWR and Spring can be combined to build a robust and flexible application that can easily change to meet evolving business requirements. Spring lets us build the service and data access layers as simple, discreet objects that are snapped together like LEGO bricks to build the application. In the next chapter you ll take a look at the only true Java standard for web frameworks, JavaServer Faces (JSF), and how JSF supports Ajax-style interactions.

// document.evaluate is an XPath function if (document.evaluate) { // fetch something via XPath } else { // fetch something the slower, more compatible way }

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