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o understand JavaServer Pages, it s necessary to understand their underlying technology Java servlets Servlets are Java classes that extend the functionality of a Web server by dynamically generating Web pages A run-time environment known as a servlet engine manages servlet loading and unloading, and works with the Web server to direct requests to servlets and to send output back to Web clients Since their introduction in 1997, servlets have become the dominant environment for server-side Java programming and a widely used portal into application servers They offer several key advantages: I Performance Older technologies such as the Common Gateway Interface (CGI) typically start a new process to handle each incoming request In the days when the Web was primarily a repository for academic and scientific research, there wasn t very much traffic and this approach worked well Servlets, by contrast, are loaded when first requested, and stay in memory indefinitely The servlet engine loads a single instance of the servlet class and dispatches requests to it using a pool of available threads The resulting performance improvement is considerable I Simplicity Client-side Java applets run in a virtual machine provided by the Web browser This introduces compatibility issues that increase complexity and limit the functionality that applets can provide Servlets simplify this situation considerably because they run in a virtual machine in a controlled server environment and require only basic HTTP to communicate with their clients No special client software is required, even with older browsers I HTTP Sessions Although HTTP servers have no built-in capability to remember details of a previous request from the same client, the Servlet API provides an HttpSession class that overcomes this limitation I Access to Java Technology Servlets, being Java applications, have direct access to the full range of Java features, such as threading, network access, and database connectivity JSP pages, which are automatically translated into servlets, inherit all these advantages This chapter provides an overview of how servlets work It examines the primary servlet objects and their API It discusses the servlet engine, the servlet lifecycle, servlet threading models, and how servlets can maintain persistent state between requests This chapter also includes an annotated example of a servlet.

Table 11-5

11:

public void release()

Sets the bodyContent variable to null, and then calls superrelease() An overriding method must call superrelease() as well, otherwise bodyContent may not be available for garbage collecting Returns the bodyContent variable Subclasses already have access to the protected variable, but this method allows unrelated tag handler classes to send output to this body content A convenience method that calls getEnclosingWriter() on the bodyContent variable and returns the result

public BodyContent getBodyContent()

public JspWriter getPreviousOut()

Table 11-5

Figure 9-4

Methods in BodyTagSupport (continued)

Figure 11-4 depicts the slightly more complex life cycle of tag handlers that interact with their body The following section describes each event in the life cycle flowchart

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The first few steps down to doStartTag() are no different than they were in Figure 11-2 The first difference is in the handling of the return code from this method doStartTag() in a body tag handler can return either SKIP_BODY, which causes an immediate branch to doEndTag(), or EVAL_BODY_TAG, which starts the chain of events that handle the tag body When EVAL_BODY_TAG is returned from doStartTag(), the JSP servlet6 invokes the page context s pushBody() method, which does three things: 1 Saves the current JspWriter on a stack

6 The term JSP servlet in this section refers to the servlet generated by the JSP container based on the JSP page source code

Figure 11-4

11:

.

2 Creates a new BodyContent object and stores it in the page context s attributes in page scope under the name out 3 Assigns the new BodyContent object to the JSP page implicit variable out After this, the JSP servlet calls the tag handler s setBodyContent() method with the new writer Next, the tag handler s doInitBody() method is called to handle any necessary initialization before the body is evaluated This initialization could also be done in doStartTag(), but the new BodyContent object isn t available there yet doInitBody() isn t called if no body is in the tag, and can throw a JspException if it detects any fatal errors At this point, the servlet handles the body of the tag as it normally would, writing its output to the BodyContent object The processing depends on the value of the <bodycontent> element of the tag in the TLD Three possible values exist for this element: I empty The tag body must be empty I JSP Scriptlets, expressions, and template HTML are evaluated as usual If any other custom tags are within the scope of the body, they are also evaluated, the same as they would be if used elsewhere on the page If any of these have tag handlers that implement BodyTag, then the process is done recursively the current BodyContent is pushed, a new BodyContent is assigned to the inner tag, and so on I tagdependent The contents of the body are written verbatim to the BodyContent Scriptlets and expressions appear in their original JSP source form, rather than being interpreted by the JSP container After handling the body, the servlet invokes the tag handler s doAfterBody() method If the tag handler wants to write its body content to the enclosing JspWriter at this time, it can do so, as follows.

JspWriter out = bodyContentgetEnclosingWriter(); outprintln(bodyContentgetString()); bodyContentclear();

JspWriter out = bodyContentgetEnclosingWriter(); bodyContentwriteOut(out); bodyContentclear();

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