Beginning JSP, JSF and Tomcat, 2nd Edition: Java Web by Giulio Zambon

By Giulio Zambon

Begin construction Java - dependent net purposes now, whether you are a entire newcomer to Java. accomplished and instance - pushed, starting JSP, JSF, and Tomcat: Java net improvement, moment variation is all you want to advance dynamic Java-based internet purposes utilizing JSP, hook up with databases with JSF, and placed them into motion utilizing the world's most well-liked open resource Java internet server, Apache Tomcat.

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The tag extension mechanism lets you create libraries of custom actions, which you can then use in all your G. info CHAPTER 2 JSP ELEMENTS applications. Several custom actions became so popular within the programming community that Sun Microsystems (now Oracle) decided to standardize them. The result is JSTL, the JSP Standard Tag Library. , Java beans). 0 as an alternative to the scripting elements, but you can also use EL and scripting elements together. I will describe EL in Chapter 4, after explaining the action elements.

For example, following a user login, you can set a session attribute to the access level of that user, so that all the pages of your application can check it before performing their function. getAttribute("MyAppOperator") if (isOperator) { ... = null); You can save in a session-scoped attribute much more than a simple access level. getAttribute("upref"); By doing so, as long as the user keeps his or her browser running and the session doesn’t timeout, you don’t need to reload the user’s preferences from a database.

The use of static variables in JSP requires some further comment. In JSP, you can declare variables in three ways: <% int k = 0; %> <%! int k = 0; %> <%! static int k = 0; %> The first declaration means that a new variable is created for each incoming HTTP client request; the second one means that a new variable is created for each new instance of the servlet; and the third one means that the variable is shared among all instances of the servlet. HttpServlet). Normally, Tomcat instantiates each one of these classes only once and then creates a Java thread for each incoming request.

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