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In the preceding example, the string manipulation could have been done with inline code in the scriptlet, rather than by a method call In some circumstances, that is not possible For example, if resources need to be acquired or threads started when a JSP page is loaded, these functions should be performed in the context of the servlet init() and destroy() methods The JSP 11 Specification expressly forbids page authors from overriding any of the servlet lifecycle methods directly, including init() and destroy()1 However,it provides two special methods named jspInit() and jspDestroy() that accomplish the same purpose These methods are automatically called from within init() and destroy(), and have empty definitions in the parent JSP page implementation In

1 JSP 11 Specification, Section 31 Although some servlet engines do not enforce this restriction, it would be unwise to ignore it

8:

Tomcat, for example, the base JSP class orgapachejasperruntimeHttpJspBase defines init() and jspInit() as follows:

public final void init(ServletConfig config) throws ServletException { thisconfig = config; jspInit(); } ELEMENTS OF JSP public void jspInit() { }

Similarly, it defines destroy() and jspDestroy() as follows:

public final void destroy() { jspDestroy(); } public void jspDestroy() { }

The use of the final keyword ensures init() and destroy() themselves cannot be overridden This, in turn, guarantees jspInit() and jspDestroy() will always be called To add something to the initialization phase of a JSP, the necessary code should be entered in a JSP declaration2:

public void jspInit() { TimerThread t = new TimerThread(); tstart(); }

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2 Curiously enough, the JSP 11 specification makes no provision for throwing an exception from jspInit(), even though init() itself can do so What can be done if the JSP detects a fatal error during its jspInit() execution is not clear

Unlike scriptlets and expressions, declarations have no access to the implicit objects described in 7 The reason for this is apparent when you remember that methods in declarations are defined outside the _jspService() method Therefore, if a declaration method needs access to one or more of these objects, the objects must be passed somehow from _jspService() You can do this in several ways: I Pass the objects as individual parameters This is easy to do, but tends to become unwieldy if more than a few parameters are necessary I Pass the pageContext implicit object as a parameter From the page context, all the other variables can be accessed indirectly I Pass a structure containing all the variables of interest as a single parameter You see how to do this in the next section The second technique (passing the page context) is illustrated in the following code:

<%@ page import="javaio*,javautil*" %> <%! public void showSessionID(PageContext pc) throws IOException { JspWriter out = pcgetOut(); HttpSession session = pcgetSession(); Date created = new Date(sessiongetCreationTime()); outprintln("The session was created at " + created); } %> <% showSessionID(pageContext); %>

The showSessionID() method is able to extract the JspWriter and HttpSession objects from the page context and use them to write to the current output stream

Just like any other Java class, a JSP page can define inner classes Inner classes are useful for running background threads or encapsulating data structures When used properly, they can preserve the object-oriented character of a Java program, which can sometimes be lost in an event-driven environment like JSP

8:

An inner class can be useful as a data structure that holds implict and other variables The page context acts as a wrapper for other objects in the servlet context, session, request, and page It also has getAttribute() and setAttribute() methods for additional user-defined fields, but these must be objects (not primitives like int and double) and must be cast to the appropriate type when retrieved An inner class is an alternative that solves the same problem in a type-safe manner An example of this technique is illustrated in the following:

Figure 7-18

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