What is the Difference Between GenericServlet and HttpServlet

The main difference between GenericServlet and HttpServlet is that the GenericServlet is protocol independent and can be used with any protocol such as HTTP, SMTP, FTP, and, CGI while HttpServlet is protocol dependent and only used with HTTP protocol.

1. What is difference between GenericServlet and HttpServlet class?
2. Which package does GenericServlet belong?
3. What is GenericServlet?
4. What is HttpServlet?
5. What is doGet and doPost?
6. Which class can handle any type of request so that it is protocol independent?
7. Why GenericServlet is an abstract class?
8. Which JSP life cycle is in the correct order?
9. Which method is called only once in Servlet life cycle?
10. Why is HttpServlet declared abstract?
11. Is HttpServlet an abstract class?
12. What are the different types of servlets?

What is difference between GenericServlet and HttpServlet class?

-> GenericServlet is a super class of HttpServlet class. -> The main difference is that, HttpServlet is a protocol dependent whereas GenericServlet is protocol independent. ... HttpServlet is an abstract class which extends GenericServlet and implements java. io.

Which package does GenericServlet belong?

Class javax. servlet. GenericServlet. The GenericServlet class implements the Servlet interface and, for convenience, the ServletConfig interface.

What is GenericServlet?

Defines a generic, protocol-independent servlet. To write an HTTP servlet for use on the Web, extend HttpServlet instead. ... GenericServlet makes writing servlets easier. It provides simple versions of the lifecycle methods init and destroy and of the methods in the ServletConfig interface.

What is HttpServlet?

HttpServlet is an abstract class given under the servlet-api present. It is present in javax. servlet. ... It extends GenericServlet class. When the servlet container uses HTTP protocol to send request, then it creates HttpServletRequest and HttpServletResponse objects.

What is doGet and doPost?

Unlike Generic Servlet, the HTTP Servlet doesn't override the service() method. Instead it overrides the doGet() method or doPost() method or both. The doGet() method is used for getting the information from server while the doPost() method is used for sending information to the server.

Which class can handle any type of request so that it is protocol independent?

GenericServlet class can handle any type of request so it is protocol-independent. You may create a generic servlet by inheriting the GenericServlet class and providing the implementation of the service method.

Why GenericServlet is an abstract class?

GenericServlet class is abstract because there is a method called service() which is public abstract void. and service() must be override, service() method defines what type of protocol is used for request. another thing is that according to Java specifiation those classes have abstract methods must declared abstract.

Which JSP life cycle is in the correct order?

7. Which one is the correct order of phases in JSP life cycle? Explanation: The correct order is Compilation, Initialization, Execution, Cleanup.

Which method is called only once in Servlet life cycle?

The destroy() method is called only once at the end of the life cycle of a servlet.

Why is HttpServlet declared abstract?

The HttpServlet class is declared abstract because the default implementations of the main service methods do nothing and must be overridden. This is a convenience implementation of the Servlet interface, which means that developers do not need to implement all service methods.

Is HttpServlet an abstract class?

HTTPServlet is an abstract class with all implemented methods. ... A subclass of HttpServlet must override at least one method, usually one of these: doGet, if the servlet supports HTTP GET requests.

What are the different types of servlets?

There are two main servlet types, generic and HTTP:

• Generic servlets. Extend javax. servlet. GenericServlet. Are protocol independent. ...
• HTTP servlets. Extend javax. servlet. HttpServlet. Have built-in HTTP protocol support and are more useful in a Sun Java System Web Server environment.