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The question is, how do you tell JSF to display the result page This is done using a navigation rule (see Figure 2 9).

Certain kinds of values must be in a particular format in order to work with your application and the other programs and subsystems it uses. It is extremely important that metacharacters or embedded commands be quoted or encoded (aka escaped) in these values, so that your PHP application does not become an unwitting participant in a scripted attack of some sort.

The design of the Eshop application uses an MVC architecture. The data and the business logic (the model) reside in a database and Java classes; the user interface (the view) is implemented in JSP; and the handler of client requests (the controller) is an HTTP Java servlet. When the servlet receives a client HTTP request, it instantiates the model s central class and forwards the request to the appropriate JSP page. The JSP page obtains data from the model and generates the HTML response. The model isn t aware of what the JSP pages do with the data they obtain, and the JSP pages aren t aware of where and how the model keeps the data.

Each such branch is called a "navigation case."

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References to variables are indicated by sticking a dollar sign before them, as shown in the following example: <x:parse doc="${sf}" varDom="dom"/> <x:forEach var="tag" select="$dom//starship"> Here we ve parsed an XML document into the variable dom and then used $dom when we referred to it in an XPath expression.

Input might contain troublesome characters, characters that can potentially do damage to your system. You can prevent damage from those characters in three ways: You might escape them by prepending each dangerous character with \, the backward slash. You might quote them by surrounding them with quotation marks so that they will not be seen as metacharacters by the underlying system. You might encode them into character sequences, such as the %nn scheme used by urlencode().

The View ID of the Next Page If O utcome is O K /stockvalue.xhtml The View ID of the Next Page If O utcome is ... Some other view ID

The XPath standard (http://www.w3.org/TR/xpath) specifies a set of core functions that all implementations of XPath must support. They are divided into node set, string, boolean, and number functions.

It may be tempting to use the magic_quotes_gpc directive (settable in phpini; information is at http://phpnet/magic_quotes), which automatically handles escaping on all GPC values, and which is set on by default It does this, however, simply by applying the addslashes() function (information is at http://phpnet/addslashes) to those variables Unfortunately, the problems raised by using magic_quotes_gpc far outweigh any possible benefits For one thing, addslashes() is limited to just the four most common of the dangerous characters: the two quotation marks, the backslash, and NULL So while the addslashes() function might catch 90% or even more of the threats, it is not comprehensive enough to be trusted For another, in order to return the data to its original form, you will need to reverse the escaping with the stripslashes() function, which is not only one extra step but also is likely to corrupt some multibyte characters.

The whole thing is called a "navigation rule."

With scripting elements, you can place code inside a JSP page. However, they are difficult to maintain. Therefore, you should use action elements and custom tags when possible. There are three types of scripting elements: scriptlets, expressions, and declarations.

What, then, is better While the mysql_real_escape_string() function (information is at http://phpnet/mysql_real_escape_string) is intended primarily to sanitize user input for safe insertion into a MySQL database, it does conveniently escape a wide range of dangerous characters: NULL, \x00, \n, \r, \, ', " , and \x1a You can ease the burden of applying it manually by including it in your initialization routine, like this: < php $expected = array( 'carModel', 'year', 'bodyStyle' ); foreach( $expected AS $key ) { if ( !empty( $_GET[ $key ] ) ) { ${$key} = mysql_real_escape_string( $_GET[ $key ] ); } } > There are unfortunately also drawbacks to using mysql_real_escape_string() for the purpose of generally sanitizing user input The function is specific to the needs of MySQL, not general escaping of dangerous values.

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