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Review Best Practices for the Client Tier
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about its state. It also provides the ability for the Controller to access application functionality encapsulated by the Model. The View renders the contents of a Model. It is usually implemented as a JSP. It accesses data from the Model and specifies how that data should be presented. When the Model changes, it is the responsibility of the View component to maintain consistency in its presentation. The View forwards user gestures to the controller. A Controller defines application behavior; it interprets user gestures and maps them into actions to be performed by the model. The servlet best fits this task. In a stand-alone GUI client, these user gestures could be button clicks or menu selections. In a web application, they appear as GET and POST HTTP requests to the web tier. The actions performed by the Model include activating business processes or changing the state of the Model. Based on the user gesture and the outcome of the Model commands, the Controller selects a View to be rendered as part of the response to this user request. Usually, one Controller exists for each set of related functionality. The implementation of MVC pattern offers the following benefits:
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n Clarifies application design through separation of data modeling (Model)
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issues from data display (View) and user interaction (Controller)
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n Facilitates distribution of the application, as MVC boundaries are natural
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CERTIFICATION OBJECTIVE 4.06
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Review Best Practices for the Client Tier
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Thin-client solutions (HTML on a browser) are important to Internet-based applications. The browser acts as your client for rendering the presentation as encoded in HTML. In addition to content that can be rendered with static HTML, the following items can be used to create web content: JSPs, servlets, applets, and JavaScript can be used to enhance the browser interface.
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4: Applicability of JEE Technology
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CERTIFICATION OBJECTIVE 4.07
Enumerate the Components and Categories of the Web Tier
The web tier produces responses that can be handled by the use of web component, a software entity that provides a response to a request. A web component typically generates the user interface for a web-based application. The JEE platform specifies two types of web components: servlets and JSP pages. Web components are hosted by servlet containers, JSP containers, and web containers. In addition to standard container services, a servlet container provides network services by which requests and responses are sent, decodes requests, and formats responses. All servlet containers must support HTTP as a protocol for requests and responses, but they may also support additional request-response protocols such as HTTPS. A JSP container provides the same services as a servlet container and an engine that interprets and processes a JSP page into a servlet. A web container provides the same services as a JSP container and provides access to the JEE service and communication APIs.
CERTIFICATION OBJECTIVE 4.08
Explain How to Apply MVC to the Web Tier
The MVC design pattern can be applied to the web tier because it results in a separation of the application data from the ways that the data can be accessed or viewed as well as from the mapping between system events (such as user-interface events) and application behaviors. As mentioned, the MVC pattern consists of three component types. The Model represents the application data along with methods that operate on that data. The View component displays that data to the user. The Controller translates user actions such as mouse movement and keyboard input and dispatches operations on the Model. As a result, the Model will update the View to reflect changes to the data. The View consists of JSP amended with JavaScript and embedded tags that can provide the full function user interface. The Controller is usually a servlet, and the Model can be a JavaBean or an EJB.
Review the Best Practices for the Presentation Layer
CERTIFICATION OBJECTIVE 4.09
Review the Best Practices for the Presentation Layer
To avoid needlessly complex presentation components in the web tier, follow these practices:
n Separate HTML from Java. n Try to place business logic in JavaBeans. n Factor general behavior out of custom tag handler classes. n Favor HTML in Java handler classes over Java in JSPs. n Use an appropriate inclusion mechanism. n Use a JSP template mechanism. n Use style sheets. n Use the MVC pattern. n Use available custom tag libraries. n Determine the appropriate level of XML compliance. n Use JSP comments in most cases. n Follow HTML best practices. n Utilize the JSP exception mechanism.
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