When a client request is made, the service method is called and passed a request and response object.
It then calls one of the following methods: doGet or doPost. In the simplest terms, then, servlets are Java classes that can generate dynamic HTML content using print statements. What is important to note about servlets, however, is that they run in a container, and the APIs provide session and object life-cycle management.
Consequently, when you use servlets, you gain all the benefits from the Java platform, which include the sandbox security , database access API via JDBC, and cross-platform portability of servlets. The file extension of a JSP page is. At this point the servlet is handled by the servlet engine, just like any other servlet.
The servlet engine then loads the servlet class using a class loader and executes it to create dynamic HTML to be sent to the browser, as shown in Figure 1. The servlet creates any necessary object, and writes any object as a string to an output stream to the browser. The next time the page is requested, the JSP engine executes the already-loaded servlet unless the JSP page has changed, in which case it is automatically recompiled into a servlet and executed. In this section, I present best practices for servlets and particularly JSP pages.
The emphasis on JSP best practices is simply because JSP pages seem to be more widely used probably because JSP technology promotes the separation of presentation from content. These two models differ in the location where the processing takes place. In Model 1 architecture, as shown in Figure 2, the JSP page is responsible for processing requests and sending back replies to clients. In this mode, JSP pages are used for the presentation layer, and servlets for processing tasks.
The servlet acts as a controller responsible for processing requests and creating any beans needed by the JSP page. The controller is also responsible for deciding to which JSP page to forward the request.
JSTL : Practical Guide for JSP Programmer
The JSP page retrieves objects created by the servlet and extracts dynamic content for insertion within a template. Note that several frameworks already exist that implement this useful design pattern, and that truly separate presentation from content. This framework is best used for complex applications where a single request or form submission can result in substantially different-looking results. Best practices -- which are proven solutions to recurring problems -- lead to higher quality applications.
This article presented several guidelines and best practices to follow when developing servlet- and JSP-based web applications. Keep an eye on servlets and JSP technologies, because several exciting things are in the works. Special thanks to Gregory Murray of Sun Microsystems, whose feedback helped me improve this article. Seller Inventory N02F More information about this seller Contact this seller 1.
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JSP: Practical Guide for Programmers (The Practical Guides)
The spine may show signs of wear. Pages can include limited notes and highlighting, and the copy can include previous owner inscriptions. Seller Inventory GI3N More information about this seller Contact this seller 2. Published by Morgan Kaufmann About this Item: Morgan Kaufmann, Condition: Used; Good.
Dispatched, from the UK, within 48 hours of ordering. This book is in good condition but will show signs of previous ownership. Seller Inventory CHL More information about this seller Contact this seller 3. Condition: Used: Good. More information about this seller Contact this seller 4. Published by Morgan Kaufmann Publishers Inc. From: Anybook Ltd.
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