The JavaServer Pages (JSP) technology was conceived specifically to address these issues in Java

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The JavaServer Pages (JSP) technology was conceived specifically to address these issues
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Introduction to JSP
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Like servlets, JSP is a type of Java 2 Platform, Enterprise Edition (J2EE) Web component JSP is similar to server-side scripting technology, but there is a key difference JSP is compiled, whereas scripts are interpreted JSP allows a program to be embedded in HTML documents, which can later be parsed by a Web server JSP utilizes the Java Servlet technology to achieve server-side processing
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A JSP consists of Java code embedded within a structured document such as HTML or XML The idea is to use the markup language for the static portions of the presentation and embed special tags within the page to markup the dynamic content The tags are also used to process incoming requests from a client and generate responses as a result When a JSP is requested, the JSP code is processed on the server, and the combined results of the processing and the static HTML page are sent back to the client
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Use of JSP allows the presentation code to be easily maintained as regular HTML code and shields the Web developer from having to deal with an unfamiliar language and tools
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Some may argue that because Java is still embedded within a JSP, the separation of presentation from business logic is not a reality The key point to keep in mind is that it is a difference of perspective In servlets, the presentation side is forced to absolutely live in the software development world, whereas JSPs are presentation-centric components with carefully packaged Java pieces embedded within them to handle the dynamic aspects
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Typical Uses of JSP
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The JSP specification provides the JSP with the same capabilities as the servlet, and it is indeed possible to create a very confusing but legal JSP that has all the code normally put in a servlet Similarly, it is equally possible to totally ignore the JSP technology and use servlets exclusively
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The proper usage is a combination of the two The idea is to leverage the JSP for presentation-centric tasks and utilize the servlets where logic is paramount A JSP is ideally suited for use in situations where dynamic content must be presented to the client In general, JSP should be focused on presentation, and any Java code embedded within the JSP should primarily be for communication with servlets and/or other control/data entities
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A JSP does consume extra system resources (eg, requires compilation), so it should not be used where presentation content is static A plain HTML page should be used in such situations
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Model 1 and Model 2 Architectures
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Two architectures, generally referred to as Model 1 and Model 2, were especially dominant in the JSP developer community when JSPs were first introduced Today, most development efforts make use of Model 2; however, there are still some simpler cases where a Model 1 approach has merit
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Model 1 architecture is simple in that it involves using JSPs for presentation as well as the business logic The advantage of this approach lies in its simplicity and its ease of implementation Unfortunately, Model 1 can quickly lead to bloated and brittle code that is hard to manage and evolve
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Model 2 architecture follows the Model-View-Controller (MVC) paradigm It is more programmer friendly as it involves using one or more servlets as controllers Requests are received by the frontline servlet(s), and then redirected to JSPs as warrante d and required The key to success with Model 2 is identifying the right number of servlets required to fulfill the tasks (extreme cases being a single servlet for everything and a servlet for each use case or possible action!) Another key element of this strategy is the use of JavaBeans as the model The JavaBean acts as the "communication" vehicle between the controller servlet(s) and the JSPs The controller fills in the JavaBean based on the request, and the JSP can then compose the actual page using values from the JavaBean In this case, the JSP typically uses the jsp:useBean tag to access the JavaBean Model 2 provides a cleaner separation of the presentation from the logic Although the Model 2 approach is harder to implement, code developed using the Model 2 approach is easier to manage
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Some developers erroneously believe that Model 1 is obsolete and has essentially been displaced by Model 2 In fact, you can employ either of the two models depending on what you are trying to achieve Deciding between the two models should be driven by the following guidelines:
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Model 1: Use this model when you are trying to build a simple Web application that does not have significant processing requirements
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Model 2: Use this model when requests typically kick off extensive processing, which can result in diverse responses
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In the end, though, the best approach is to use whichever model you are comfortable with and whatever works for your development team and style[1]
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