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n 2, we explained JSP through a series of examples. Here, we ll provide several additional examples and a more systematic description of JSP 2.1. This appendix is consistent with the documents jsp-2_1-fr-spec.pdf and jsp-2_1-el-spec.pdf, which together constitute version 2.1 of the JSR 245 standard (consisting of two documents, JavaServer Pages Specification Version 2.1 and Expression Language Specification Version 2.1). You can download both documents from the JCP web site (http://jcp.org/). There are three types of elements in JSP pages: directive, action, and scripting. Directive elements are messages to the JSP container. Their purpose is to provide information on the page itself necessary for its translation. As they have no association with each individual request, directive elements output no data to the HTML response. Action elements specify activities that need to be performed when the page is requested. They can use, modify, and/or create objects, and they may affect the way in which data is sent to the output. In addition to the standard action elements, it is possible to specify extensions in the form of custom tag libraries. JSTL is one such extension, which we mention here because it has been standardized by Sun Microsystems and is universally available. Scripting elements can be declarations, scriptlets, and expressions, but they all are Java fragments capable of manipulating Java objects, invoking their methods, and catching Java exceptions. Like actions, they execute when the page is requested, and they can send data to the output. EL was introduced in JSP 2.0 as an alternative to the scripting elements. You can use EL expressions in action attributes specified to be capable of accepting runtime expressions. You can also use EL in JSP templates (JSP files that include parameterized content).

Strategies for answering these questions include moving files-in-progress to a different folder, renaming files to keep track of state and which process ID is actively working with the data, and using a second drop folder to store the results where they can be found by the web application. The daemon may clean up leftover original and processed files on its own, or rely on a separate garbage-collection script.

Whether objects are created explicitly within JSP pages when processing a request or implicitly by Tomcat, you cannot use them properly unless you know in which scope they are available. There are four possible scopes. In order of increasing generality, they are page, request, session, and application.

Figure 5 11. Using <ui:insert> to trace into the body Finally, define the <box> tag in foo.taglib.xml, as shown in Listing 5 24. Listing 5 24. Defining the <box> Tag

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A good way to handle resource- and therefore time-intensive batch jobs is to store them in a database. This has the advantage of being possible even when an IMAP server is not available. It also relies on a familiar, rather than a slightly unusual, management interface. The MySQL code for creating such a database table might look something like this: CREATE TABLE jobs ( id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY, request TEXT, created DATETIME, started DATETIME, finished DATETIME, data TEXT, result TEXT, status VARCHAR(255), INDEX ix_status ( status ) ); Your processor script would need to retrieve unprocessed jobs based on their status, send them off for processing (and update the started and status fields), store the results (and again update the finished and status fields), and notify the user that the results are available for retrieval. Here is a PHP class to handle these tasks. It can be found also as jobManagerClass.php in the 12 folder of the downloadable archive of code for Pro PHP Security at http://www.apress.com. < php class jobManager { public $id; // the record id in the jobs db public $request; // request to processor api public $created; // mysql datetime of insertion in the queue public $started; // mysql datetime of start of processing public $finished; // mysql datetime of end of processing public $data; // optional data to be used in carrying out request public $result; // response to request public $status; // status of the job: new, running, or done private $db; // database handle - an open mysql/mysqli database // constructor assigns db handle public function __construct( $db ) { if ( get_class( $db ) != 'mysqli' ) { throw new Exception( "\$db passed to constructor is not a mysqli object." ); } $this->db = $db; }

The JSP container (i.e., Tomcat) defines several objects that you can use within the scripting elements. They are application, config, exception, pageContext, out, request, response, and

<!DOCTYPE facelet-taglib PUBLIC "-//Sun Microsystems, Inc.//DTD Facelet Taglib 1.0//EN" "http://java.sun.com/dtd/facelet-taglib_1_0.dtd"> <facelet-taglib xmlns="http://java.sun.com/JSF/Facelet"> <namespace>http://foo.com</namespace> <tag>

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