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I JSP expressions and lines of HTML get translated into outprint() statements inside the _jspService() method in the order they occur I Scriptlets are copied verbatim into _jspService() I Declarations are copied verbatim into the source code outside of _jspService() I Standard JSP actions such as <jsp:include>, <jsp:useBean>, and <jsp:setProperty> are translated into the run-time logic that performs their function I Custom tags are expanded into Java statements that call methods in their corresponding tag handler

The container uses the taglib directives to locate Tag Library Descriptors (TLDs) and to match them to custom tags used in the page based on the tag prefix used For example, if the directive is

then the container reads the databasetld file to get a list of tags it describes and the name of the tag handler class associated with each one When it encounters a tag later in the page with a namespace prefix,

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it looks for a tag library associated with that prefix that has a tag with the specified name The container uses information about the tag s structure, which it finds in the TLD, to generate a series of Java statements that accomplish the tag s function In the case of the db:connect tag previously shown, this would include 1 Code to create an instance of the connect tag handler or obtain one from a pool 2 Code to pass the connect tag handler a reference to the pageContext object This is a useful feature because it gives the tag handler access to the JSP page s Request, Response, HttpSession, ServletContext, and output stream objects It also means the tag handler can get or set attributes at any level the page context manages 3 Code to pass a reference to the parent tag, if db:connect is nested within another custom tag 4 A call to the connect tag handler s setUrl() method, passing the mydatabase value 5 A call to a method named doStartTag(), which the connect tag handler implements to perform any action that takes place when its start tag is encountered (more about this shortly)

In the body of a JSP page, a custom tag may look like this:

<app:mail from="Accounting Manager" to="Staff" > <app:subject>Expense Reports</app:subject> Please be sure to submit all expense reports before the fifteenth day of the month to allow sufficient processing time Thanks </app:mail>

The components of this tag include: I A start tag <app:mail > with zero or more attributes I An end tag </app:mail> I The lines between the start and end tag, known as the body of the tag, which may include ordinary text or other JSP statements3 In transforming the tag into servlet code, the container invokes the tag handler for each of these components, using the pageContext object to share attributes to the handler The invocation of these methods is sometimes referred to as the tag handler s lifecycle For this to work, a tag handler must implement one of two interfaces: I javaxservletjsptagextTag bodies for tags that don t operate on their for tags that do BodyTag is a

These interfaces specify the lifecycle methods the tag handler must provide The API also provides two support classes TagSupport and BodyTagSupport that act as the default implementation of the two interfaces Most tag handlers extend these support classes rather than implementing the interfaces directly, although the interfaces aren t particularly complex One benefit of using a support class is you can override only the methods you need to change, allowing the support class to handle the rest In addition, the support class can take care of saving the page context and body content objects in protected variables, so subclasses can simply access them

3 A tag is not required to have a body A tag may simply perform its function based on the attributes specified in the start tag In this case, using the shorthand <tag /> notation is common

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