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In the case of a Model 2 Web application, all user requests are referred to a single URL, a servlet sometimes called a dispatcher (the controller) This servlet looks in the request s path information for an indication of what it needs to do There may be a table of actions and names of JSP pages to handle each of them These action handlers constitute the model of the application They may access a database or perform other calculations, and then populate JavaBeans or other classes with the results Finally, they invoke JSP pages (the view) to present their output Which of these models is superior Model 1 is easier to throw together quickly, but it doesn t scale Too much is packaged together and it becomes unwieldy as the application grows Model 2 scales much better and also allows specialists to write different parts of the application: I Java programmers can write the model and controller I User interface specialists can write JSP pages that do nothing but display output

Summary

A number of situations exist in which splitting the processing of an HTTP request is advantageous JSP provides two general capabilities to support this: I Including other resources, either with <%@ include %> or <jsp:include> I Forwarding a request using <jsp:forward> Included resources can be either static (like HTML) or dynamic (like a JSP or servlet) The capability to forward requests provides the basis for table-driven applications Two general development architectures exist, commonly referred to as Model 1 and Model 2 Model 1 uses JSP pages to accept user input, to access databases as needed, and to format its output Model 2 follows the MVC paradigm, allowing complex projects to be separated as necessary between groups of people who specialize in one layer or another

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SP pages contain not only code that handles requests and generates responses, but instructions to the JSP compiler as well These instructions are called directives This chapter covers the one most commonly used the page directive This directive provides a means for setting attributes that affect how the page is interpreted and executed The syntax is as follows:

<%@ page attribute="value" attribute="value" %> where the attributes can be any of the following: language="scripting language" extends="className" import="importList" session="true|false" buffer="none|sizekb" autoFlush="true|false" isThreadSafe="true|false" info="info_text" contentType="ctinfo" errorPage="error_url" isErrorPage="true|false" The attributes can be specified in any order, and more than one page directive can be specified in a compilation unit (the JSP page and any files it includes with the include directive) If multiple page directives are used, however, they cannot specify the same attribute more than once, with the exception of the import attribute The remainder of this chapter discusses each of these attributes in detail

The JSP architecture allows room for it to be extended as a general framework for server-side scripting For this reason, it supports a language attribute in the page directive The value specified (which is java by default) applies to all declarations, expressions, and scriptlets in the current translation unit, including any files specified in an include directive All JSP 11-compliant containers must support the value java for the language attribute No other language is supported in the JSP 11 specification, although individual JSP engines may do so Although the specification allows for other languages to be used, it imposes some restrictions The language must support the Java Runtime Environment to the extent that it allows access to the standard implicit object variables, to JavaBeans get and set methods, and to public methods of Java classes JRun 30 supports both java and javascript as values for the language attribute When java is the language used either explicitly or implicitly the scriptlets, expressions, and declarations found in the JSP page are copied to the

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generated servlet as usual When javascript is specified, there is still a generated Java servlet, but it does not contain the javascript code Instead, the servlet initializes a scripting engine that reads and interprets the original JSP page For example, if the JSP page looks like this,

then the generated servlet includes the statements,

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