Answer to Question #282703 in Java | JSP | JSF for Vijayadav

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Answer to Question #282703 in Java | JSP | JSF for Vijayadav

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Java | JSP | JSF

Question #282703

Explain with the help of an example/diagram or write code for the following using JSP:

a) JSP life cycle.

b) Need of Directives in JSP with the help of taglib directive.

c) Use of scriptlet with the help of an example on displaying a number series from 1 to 10

d) The role of action elements in JSP with the help of an example of <jsp:usebean)

e) The purpose of using implicit objects in JSP with the help of an example.

Expert's answer

a)

Compilation
Initialization
Execution
Cleanup

(https://www.tutorialspoint.com/jsp/jsp_life_cycle.htm)

b)

JSP directives are the messages to JSP container. They provide global information about an entire JSP page.
JSP directives are used to give special instruction to a container for translation of JSP to servlet code.
In JSP life cycle phase, JSP has to be converted to a servlet which is the translation phase.
They give instructions to the container on how to handle certain aspects of JSP processing
Directives can have many attributes by comma separated as key-value pairs.
In JSP, directive is described in <%@ %> tags.

(https://www.guru99.com/jsp-actions.html)

<%@ taglib uri = "http://www.example.com/test" prefix = "mytag" %>

<html>
   <body>
      <mytag:subtag/>
   </body>
</html>

c)

A JSP scriptlet is used to contain any code fragment that is valid for the scripting language used in a page.

(https://docs.oracle.com/javaee/5/tutorial/doc/bnaou.html)

<html>
   <body>
      <%
         for (int i = 1; i < 11; i++){
           out.println(i);         
         }
      %>
   </body>
</html>

d) These actions use constructs in XML syntax to control the behavior of the servlet engine. You can dynamically insert a file, reuse JavaBeans components, forward the user to another page, or generate HTML for the Java plugin.

(https://www.tutorialspoint.com/jsp/jsp_actions.htm)

<html>
   <body>
      <jsp:useBean id="obj" class="mypackage.Test"/>  
      <%
      for (int i = 1; i < 11; i++){
        out.println(obj.power(i, 2));         
      }
      %>
   </body>
</html>

e) These Objects are the Java objects that the JSP Container makes available to the developers in each page and the developer can call them directly without being explicitly declared.

(https://www.tutorialspoint.com/jsp/jsp_implicit_objects.htm)

out - is the implicit object

<html>
   <body>
      <jsp:useBean id="obj" class="mypackage.Test"/>  
      <%
      for (int i = 1; i < 11; i++){
        out.println(obj.power(i, 2));         
      }
      %>
   </body>
</html>

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