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How do you explain What is a Scriptlet?
In JavaServer Pages (JSP) technology, a scriptlet is a piece of Java-code embedded in the HTML-like JSP code. The scriptlet is everything inside the <% %> tags. Between these the user can add any valid Scriplet i.e. any valid Java Code. Scriptlets are executed at request time, when the JSP engine processes the client request. If the scriptlet produces output, the output is stored in the out object, from which you can display it.
What is the difference between script and scriptlet?
"script" is an HTML tag used to include JavaScript on a web page. Example: <HTML> <body> <script type="text/javascript"> document.write("hi there"); // javascript interpreted by the browser </script> </body> </HTML> "Scriptlet" is a JSP construct used to include Java in a JSP page. Example: <HTML> <body> <% // this is a scriptlet response.getWriter().write("hi there"); // Java executed on the server %> </body> </HTML> Here the result (an HTML document with the text "hi there") is the same in both cases, but the mechanisms are different - Javascript runs in the browser (any browser), while the JSP scriptlet is executed on the server and needs a server with JSP support. See related links.
How can you get the current JSP Page name?
Using either of the two below commands inside a JSP Scriptlet: application.getRealPath(request.getServletPath()); or getServletConfig().getServletContext().getRealPath(request.getServletPath());
Can variable declared in one scriplet access in another scriplet?
No. Variables declared inside a scriptlet are like method local variables which are not accessible outside the scriptlet/method.
How do you call javascript function from scriplet?
To call a JavaScript function from a JSP (JavaServer Pages) scriptlet, you can use the <script> tag within the scriptlet code. For example: <% out.println("<script>myJavaScriptFunction();</script>"); %> This code dynamically generates a <script> tag that calls the specified JavaScript function when the JSP is rendered in the browser. Ensure that the JavaScript function is defined and accessible in the client-side context.
What method do you override to initialize instance variables in a JSP declaration?
jsp init()
What is the difference between variable declared inside the declaration part and variable declared in scriptlet part?
Variable declared inside declaration part is treated as a global variable, which means after translation of jsp file into servletthat variable will be declared outside the service method as an instance variablethe scope is available to the complete jspVariable declared inside a scriplet will be declared inside a service method as a local variable and the scope is with in the service method.
Which method invalidate session of a jsp page?
session.invalidate()
Describe jsp processing?
JSPs are converted to servlets before the container runs them. This is actually cool because you don't need hardcore java programming skills to create a JSP page whereas you'll need them to write a servlet. Moreover, all you'll need to write a JSP is some expertise in creating HTML files and in using JavaScript. You can create front-end JSP pages without having much expertise in Java at all. Although JSP reduces the required skill level, JSP becomes a servlet, with the nice performance and portability benefits.
What is doGet method in servlet?
The doGet() method is the method inside a servlet that gets called every time a request from a jsp page is submitted. The control first reaches the doGet() method of the servlet and then the servlet decides what functionality to invoke based on the submit request. The get method called when the type of page submission is "GET" There is another way of submitting requests from a jsp page is "POST" and when that happens it calls the doPost() method inside the servlet.
What are jsp actions?
JSP actions are XML tags that direct the server to use existing components or control the behavior of the JSP engine. JSP Actions consist of a typical (XML-based) prefix of "jsp" followed by a colon, followed by the action name followed by one or more attribute parameters. There are six JSP Actions: < jsp : include / > < jsp : forward / > < jsp : plugin / > < jsp : usebean / > < jsp : setProperty / > < jsp : getProperty / >
What does the programming term JSP mean?
JavaServer Pages (JSP) is a server-side programming technology that enables the creation of dynamic, platform-independent method for building Web-based applications. JSP have access to the entire family of Java APIs, including the JDBC API to access enterprise databases.
