HttpServlet. An abstract class that simplifies writing HTTP servlets. It extends the GenericServlet base class and provides an framework for handling the HTTP protocol.
Is HTTP servlet is abstract class?
Provides an abstract class to be subclassed to create an HTTP servlet suitable for a Web site. A subclass of HttpServlet must override at least one method, usually one of these: doGet , if the servlet supports HTTP GET requests.
What is an HTTP servlet?
A servlet is a Java class that runs in a Java-enabled server. An HTTP servlet is a special type of servlet that handles an HTTP request and provides an HTTP response , usually in the form of an HTML page. ... HTTP servlets form an integral part of the Java 2 Enterprise Edition (J2EE) standard.
Is generic servlet a class?
Hierarchy of Generic Servlet
GenericServlet is an abstract class and it has only one abstract method, which is service(). That’s why when we create Generic Servlet by extending GenericServlet class, we must override service() method.
Is servlet a class or interface?
The Servlet interface is the root interface of the servlet class hierarchy . All Servlets need to either directly or indirectly implement the Servlet interface. The GenericServlet class of the Servlet API implements the Servlet interface.
Which one is a servlet interface?
All servlets implement this interface. Servlet writers typically do this by subclassing either GenericServlet , which implements the Servlet interface, or by subclassing GenericServlet’s descendent, HttpServlet.
What is servlet life cycle?
A servlet life cycle can be defined as the entire process from its creation till the destruction . ... The servlet is initialized by calling the init() method. The servlet calls service() method to process a client’s request. The servlet is terminated by calling the destroy() method.
Why HTTP servlet is an abstract class?
It is abstract because the implementations of key methods have to be provided by (e.g. overridden by) a custom servlet class . As the javadoc says: A subclass of HttpServlet must override at least one method, usually one of these: doGet, if the servlet supports HTTP GET requests.
Is HttpServlet an interface?
The HttpServlet class extends the GenericServlet class and implements Serializable interface . It provides http specific methods such as doGet, doPost, doHead, doTrace etc.
Which method works at server side?
| forward() method sendRedirect() method | The forward() method works at server side. The sendRedirect() method works at client side. | It sends the same request and response objects to another servlet. It always sends a new request. |
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What is Servlet example?
Simply put, a Servlet is a class that handles requests, processes them and reply back with a response . For example, we can use a Servlet to collect input from a user through an HTML form, query records from a database, and create web pages dynamically.
What is HTTP servlet response class?
HttpServletResponse is a predefined interface present in javax. servlet. http package. It can be said that it is a mirror image of request object. The response object is where the servlet can write information about the data it will send back.
What is Servlet and its types?
servlet. ... HTTP servlets provide a service method that automatically routes the request to another method in the servlet based on which HTTP transfer method is used. So, for HTTP servlets, override doPost() to process POST requests, doGet() to process GET requests, and so on.
What is generic servlet class?
GenericServlet class implements Servlet, ServletConfig and Serializable interfaces. It provides the implementation of all the methods of these interfaces except the service method. GenericServlet class can handle any type of request so it is protocol-independent.
What is a servlet request?
Defines an object to provide client request information to a servlet . The servlet container creates a ServletRequest object and passes it as an argument to the servlet’s service method. A ServletRequest object provides data including parameter name and values, attributes, and an input stream.
What is HTTP servlet and generic servlet?
GenericServlet defines a generic, protocol-independent servlet . GenericServlet gives a blueprint and makes writing servlet easier. ... GenericServlet implements the log method, declared in the ServletContext interface. To write a generic servlet, it is sufficient to override the abstract service method.
