Why is HttpServlet abstract?
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.
What is the 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.
What are the methods of RequestDispatcher and why do you need them?
The RequestDispatcher interface provides the option of dispatching the client’s request to another web resource, which could be an HTML page, another servlet, JSP etc. It provides the following two methods: public void forward(ServletRequest request, ServletResponse response)throws ServletException, java.
What is HttpServletRequest in spring?
HttpServletRequest is an interface which exposes getInputStream() method to read the body. By default, the data from this InputStream can be read only once.
How do I find the IP address of HttpServletRequest?
In Java, you can use HttpServletRequest. getRemoteAddr() to get the client’s IP address that’s accessing your Java web application.
Why HttpServlet class is declared abstract explain with an example?
It is declared as a class instead of an interface to implement most of the cruft/repeatable code required for setting up a servlet. It is declared as abstract since it wouldn’t make sense to instantiate a “bare bones” servlet which takes care only of the setup and doesn’t contain any custom/user defined logic in it.
Which abstract class contains init () and destroy () of a servlet?
javax.servlet Class GenericServlet
| Method Summary | |
|---|---|
| void | destroy() Called by the servlet container to indicate to a servlet that the servlet is being taken out of service. |
| abstract void | service(ServletRequest req, ServletResponse res) Called by the servlet container to allow the servlet to respond to a request. |
What is JSP tag?
It stands for Java Server Pages. It is a server side technology. It is used for creating web application. It is used to create dynamic web content. In this JSP tags are used to insert JAVA code into HTML pages.