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Please consult the servlet container documentation for more information. Also, it is always a good idea to precompile all the pages. In this way, we check for syntax errors and keep the pages ready to be served, thus reducing the response time for the first request to each page. If the value is false, the precompilation will not occur. The parameter can also be specified without any value, in which case the default is true: In either case, true or false, the page will not be executed.
Also, this would be a good place to point out that all of the request parameter names that include the prefix jsp are reserved and must not be used for user-defined values. Thus, the following usage is not recommended and may result in unexpected behavior: Loading and instantiation After successful compilation, the container loads the servlet class into memory and instantiates it. The HttpJspPage interface extends the JspPage interface of the same package, which in turn extends the Servlet interface of the javax.
The generated servlet class thus implements all the methods of these three interfaces and is also known as the page s implementation class.
The JspPage interface declares only two methods jspinit and jsp- Destroy that must be implemented by all JSP pages regardless of the clientserver protocol. This base class provides the default implementations of all the methods of the Servlet interface and the default implementations of both methods of the JspPage interface: jspinit and jspdestroy. It is called before any other method, and is called only once for a servlet instance.
We discuss the details of this method in chapter This is the last method that is called on the servlet instance, and it is used to clean up the resources acquired in the jspinit method. We are not required to implement the jspinit and jspdestroy methods, since they have already been implemented by the base class. Use jspdestroy to save the final value to the file when the server shuts down.
The file acts like a database. When the page is first loaded into the servlet container, the engine will call the jspinit method. Finally, when the page is about to be destroyed, the container will call the jspdestroy method. In this method, we open the resource database file again, and save the latest value of the variable count into it.
Because the JSP page is converted into a servlet, we can call all the methods in a JSP page that we can call on a servlet. Hence we can get the ServletContext object via getservletconfig. Also, the base class of the page s generated class extends javax. In Tomcat and many other containers, the base class of the page s generated class also implements the ServletConfig interface. Thus, in both methods, jspinit and jspdestroy , we get the Servlet- Context object by using the method getservletcontext , which is actually defined in the javax.
The returned Servlet- Context object can then be used in a JSP page exactly the way we use it in normal servlets. In our example, we are using the ServletContext object to convert the relative path of a resource into its real path. When the server is started the very first time and the page is first accessed, the file counter.
We can catch the exception and log the error message with this method. When the server is started the second time and the JSP page is loaded, the jspinit method will find the file and initialize the count variable to its previously saved value.
This directive applies to the entire translation unit and not just to the page in which it is declared. A Boolean literal specifying whether the current JSP page is capable of handling errors. Any scripting language supported by the JSP engine. Any valid Java class that implements javax. Specifies the size of the output buffer.
If a buffer size is specified, it must be in kilobytes kb. If buffering is not required, specify the string none. A Boolean literal indicating whether the buffer should be flushed when it is full.
For example, if we want to use the Date class of the package java. At the time of translation, the JSP engine inserts an import statement into the generated servlet for each of the packages declared using this attribute. A JSP engine always imports the java. NOTE import is the only attribute of the page directive that can occur multiple times in a translation unit. The default value is true, in which case the JSP engine declares the implicit variable session.
We will learn more about implicit variables in chapter Just as in normal Java programs, we can handle the exceptions in JSP pages using try-catch blocks.
However, the JSP specification defines a better approach, which separates the error-handling code from the main page and thus promotes reusability of the exception-handling mechanism. In listing Instead, with the help of the errorpage attribute, it instructs the JSP engine to delegate the error handling to errorhandler. The iserrorpage attribute conveys whether the current page can act as an error handler for any other JSP page. The default value of the iserrorpage attribute is false. For example, the errorhandler.
Because it does not implement any business logic, it can be reused for different JSP pages. It is not necessary that the errorpage value be a JSP page. This prevents unanticipated error messages from being displayed on the client s browser The language and extends attributes The language attribute specifies the language used by a page in declarations, scriptlets, and expressions.
The default value is java, which is also the only value allowed by the JSP Specification 2. This is useful only if we want to customize the behavior of the generated servlet class. The default base class is vendor specific and is designed to work efficiently with the rest of the framework.
Consequently, this attribute is seldom used. The default size of the buffer is JSP engine implementation dependent, but the specification mandates it to be at least 8kb. To send the data directly to the client without any buffering, we can specify the value as none. The autoflush attribute specifies whether the data in the output buffer should be sent to the client automatically as soon as the buffer is full. The default value for autoflush is true.
If it is set to false and the buffer is full, an exception is raised when we attempt to add more data to the buffer. The order and placement of page direc tives do not matter.
The import attribute can occur multiple times. The value must specify the size of the buffer in kb.
We learned the basic rules of the six JSP syntax elements directives, declarations, scriptlets, expressions, actions, and comments and we examined the first four in depth. We learned that JSP pages are translated into servlet instances before serving the client s requests, and we reviewed the seven phases of the JSP page life cycle.
Through its 12 attributes, a page directive provides information about the overall properties of a JSP page to the JSP engine. We need to understand all of the attributes for writing real-life JSP pages, but in preparing for the exam, it is especially important to understand import, session, errorpage, and iserrorpage. Consider the following code and select the correct statement about it from the options below. Which of the following tags can you use to print the value of an expression to the output stream?
Which of the following methods is defined by the JSP engine? Select one a javax. Write the name of the method that you can use to initialize variables declared in a JSP declaration in the space provided.
Write only the name of the method. Do not write the return type, parameters, or parentheses. Which of the following correctly declares that the current page is an error page and also enables it to take part in a session?
Deshmukh J. Malavia M. The new edition will help you learn the concepts large and small that you need to know. It covers the newest version of the exam and not a single topic is missed. Although the SCWCD Exam Study Kit has one purpose, to help you get certified, you will find yourself returning to it as a reference after passing the exam.
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