Beginning JSP, JSF and Tomcat: Java Web Development by Giulio Zambon

By Giulio Zambon

Start development Java–based net functions now, no matter if you’re a whole newcomer to Java. finished and example–driven, Beginning JSP, JSF, and Tomcat: Java net improvement, moment Edition is all you must boost dynamic Java-based internet purposes utilizing JSP, hook up with databases with JSF, and placed them into motion utilizing the world’s preferred open resource Java internet server, Apache Tomcat.

  • A finished creation to JavaServer Pages (JSP), JavaServer Faces (JSF), and the Apache Tomcat internet program server
  • Key thoughts made effortless to understand by means of quite a few operating examples and a walkthrough of the advance of a whole e-commerce undertaking
  • Written for pros by means of a training Java net program expert and specialist

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Downcast) the value, as in int iVar = (int)1234567L;. Be careful with that, because you might lose precision when downcasting floating point numbers! You can assign objects to variables of other types, but only if the type of the variable is a superclass of the class from which you instantiated the object. Similarly to the downcasting of numeric types, you can typecast a value of a superclass into a variable of a subclass type. Comparison operators are straightforward when applied to primitive data types.

The only piece of the puzzle that you still need is how to make the MyLog class. This is also simple: • Open the folder %CATALINA_HOME%\webapps\ROOT\WEB-INF\. • If WEB-INF has no subfolder named classes (it shouldn’t, if you have a fresh installation of Tomcat), create one. java shown in Listing 2-6. java. • Restart Tomcat. 29 CHAPTER 2 JSP ELEMENTS Listing 2-6. java opens your log file in append mode and adds the date and time to your entry before writing it into the file. Notice that the methods are synchronized, so that several pages can log entries at the same time without them getting mixed up.

In the next sections, I will first go through the scripting elements, because they are easier to understand and you can use them to glue together the rest. Then, I will describe the implicit objects and the directives. , request object – authentication). 1 Every Java executable—whether it’s a free-standing program running directly within a runtime environment, an applet executing inside a browser, or a servlet executing in a container such as Tomcat—boils down to instantiating classes into objects and executing their methods.

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