Lifecycle phases of JSP

java 

There are 6 different lifecycle phases present for JSP namely:-

1. Translation Phase
2. Compilation Phase
3. Instantiation / Object Creation Phase
4. Initialization Phase
5. Service Phase
6. Destruction Phase

Lifecycle methods of JSP

There are 3 different lifecycle methods present for JSP namely:-

1. jspInit() ====> @Override
2. jspService(HttpServletRequest req, HttpServletResponse resp)
3. jspDestroy() ===> @Override

Note:- JSP is used to give Presentation Logic.

Q) Why is JSP used to give Presentation Logic instead of Html?

  Ans:- JSP is used to give Presentation Logic instead of HTML because of code simplification.

Contents of JSP:

1. Html

2. PageDirective:- default content of JSP.

3. Scriptlet:-It is the area which is used to write the Java Code File.

                 In case of JSP, Sciptlet is represented as <%     %>

                 Ex:-

                       <% out.println(2*5) %>

4. Expression:- It is used to represent or print the Java Codes i.e Output.

  In the case of JSP, Expression is represented as <%= %>

5. Declarative:- Data which are declared on an XML File.

        web.xml   ---> pom.xml[Maven] --- internet

Note:-

1. Most of the contents of JSP fit into _jspService().

2. The Naming convention followed by Apache Tomcat Server to store all the TranslatedServlet into the work folder of Apache Tomcat Server is [Filename_jsp.java].

  Eg:-

        If the Filename is Test.JSP, then TranslatedServlet name while sharing into the work folder is Test_jsp.java.

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