Sams Teach Yourself JavaServer Pages 2.0 in 24 Hours, by Mark Wutka, Alan Moffet, Kunal Mittal

By Mark Wutka, Alan Moffet, Kunal Mittal

In JavaServer Pages 2.0, solar has extra new positive aspects that make it even more uncomplicated to create dynamic, interactive websites in Java. those contain a integrated expression language and a library of tags (the JSP normal Tag Library) that facilitate construction of pages.Sams educate your self JavaServer Pages 2.0 in 24 Hours starts off with the fundamentals of JSP, and explains the expression language, JSTL, developing new tags and extra. every one lesson builds at the earlier one, supplying you with a whole photo of JSP improvement. Later chapters describe find out how to comprise XML, interface with better Java functions, paintings with well known frameworks similar to Struts, and extra. The e-book contains Apache Tomcat, Sun's reference implementation of JSP, so that you can commence constructing purposes instantly.

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Example text

The next two tags, and , provide brief descriptions of the application. The tag defines a short name for the application that may be displayed by the servlet container's management interface, or possibly in log files. The tag provides a longer text description of the application. xml file can contain any number of servlet definitions, each specified by a tag that must contain at least a servlet name and a classname. HelloWorldServlet.

It allows a servlet to handle GET or POST requests and works with other operations specific to HTTP. Using HttpServlet, the example only needed to implement doGet (overriding a method of HttpServlet) to be able to produce a response to an HTTP GET request from a browser. A3: References to instances of the classes ServletRequest and ServletResponse are passed as parameters to the service method. In the case of an HttpServlet object, references to instances of HttpServletRequest and HttpServletResponse are passed to the doGet method (as well as other methods that may need to interact with these objects).

The first time the user hits the page, you can detect that there is no form data to process and just present the initial input form. After that, when you detect the presence of previous form data you can process it. There are a few different techniques you can use to detect the form data: • Look for the presence of form variables. 56 57 • Pass a special variable indicating that this is a form submission. • Submit the form using the HTTP POST method and examine the request method in your form. Looking for the form variables is the easiest of these methods.

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