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JSP provides three action tags specifically to work with JavaBeans:
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Tag Use Bean Syntax <jsp:useBean id="nameForPage" scope="scope" class="fullyQualifiedName" />
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Description Finds the bean of the specified name and scope, instantiates it if necessary, and makes it available to the following tags Scope is page by default, but can be set to session, request, or application Note that the jsp:useBean tag can be non-empty, containing tags that initialize the bean Returns the value of the specified property for the named bean Sets the property with the value specified The special case property=" * " sets all properties whose names match the request parameters
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<jsp:getProperty name="bean" property= "name" /> <jsp:setProperty name="bean" property= "name" value="newValtie" />
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When working with JSP, there are two approaches to building an application - called the JSP Model 1 and Model 2 architectures They are concerned with the division of labor involved in processing the request, acting on it, and presenting the results
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The JSP Model 1 Architecture
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The Model 1 architecture, shown in the figure below, takes the view that it is the JSP page thai communicates with the client, handling all the requests and responses Data access is performed by directly calling the data source, sometimes with the assistance of JavaBeans In this context, JavaBeans are used to exchange information between JSP pages or between servlets and JSP pages
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So, in the diagram, the sequence for answering the request is something like:
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1 - A request is received, which the JSP page processes 2a - The JSP page uses aJavaBean to access shared state (for the application or the session, for example) 2b - Alternatively, the JSP page can go direct to the data source, or use another enterprise Java API 3 - The JavaBean accesses the data source, for example, to update the data it stores or add an order to the system 4 - The JSP page formats and outputs a response to the browser
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Even though there is some level of separation of the presentation logic from the actual data, the business logic is embedded within the JSP page,
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The JSP Model 2 Architecture
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The Model 2 architecture, shown in the next figure, is generally deemed a better approach, in the sense that it allows for the separation of presentation logic (placed in the JSP pages), from business logic (placed in servlets) The following figure shows how the architecture prepares a response:
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1 - You can consider the servlet as a controller that is responsible for processing the request from the client 2a - Depending on the type of the request, the servlet may instantiate aJavaBean and initialize it with the information that results from processing the request 2b - Or the servlet can use some other methods to access the data requested by the client, for example, the direct access to the data source shown here, or a layer of business objects 3 - Then it will forward the request to the appropriate JSP page, which will eventually send the response to the client 4a and 4b - The JSP page only has to take care of retrieving data from any JavaBeans or other data access mechanisms that the servlet might have created; that data is then inserted into the appropriate places in the HTML templates 5 - The JSP page is returned to the client as a response stream
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In this model the servlet does not generate an HTML response, it only generates the interim data (often stored in the session in the form of JavaBeans), which the JSP page formats into a view
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A point has to be made regarding the size of these objects if they are attached to a session The larger they are the bigger the impact on the scalability of the system When using the clustering option in WebLogic server, these objects must be replicated between servers to facilitate fail-over Keep the size of these objects to an absolute minimum
The most obvious benefits of this architecture are in the development process: Q Although JSP pages are compiled into servlets, the developer has no access to the servlet as a class, which can be hard for those used to being able to see the whole control structure of a class Currently the IDEs for JSP pages do not give the same level of sophistication as Java IDEs, which means that when you are writing the Java code for a JSP page you have less ability to check your code And if it doesn't work, you won't see the error until you deploy your JSP page, by which time it is very hard to track it down An important benefit of this architecture is the fact that, by removing the business logic from JSP pages, you no longer need an experienced Java developer to create JSP pages Put another way, the JSP pages can and should be developed by an HTML specialist who knows how to create great pages, with the required knowledge of Java kept to a minimum (syntax and control statements) to enable design of dynamic pages The actual business logic that requires Java developers is now contained in servlets and other Java objects This addresses an important issue for management, providing a clear split in responsibilities that suits the talents of the development teams
The model uses either the RequestDispatcher interface's forward () method or HttpServletResponse interface's sendRedirect () method Both methods eliminate the possibility of the servlet generating part of the response, as that causes an exception to be thrown at execution time
Note that they differ quite a lot The forward () method retains the existing request and response objects (and URL in the browser), while the sendRedirect () method causes a new request/response object to be created when the request comes back A redirect is also much slower as there are two extra network steps involved