What do you mean by servlet?
A servlet is a Java programming language class that is used to extend the capabilities of servers that host applications accessed by means of a request-response programming model. Although servlets can respond to any type of request, they are commonly used to extend the applications hosted by web servers.
What is doGet and doPost?
->doGet() shall be used when small amount of data and insensitive data like a query has to be sent as a request. ->doPost() shall be used when comparatively large amount of sensitive data has to be sent. Examples are sending data after filling up a form or sending login id and password.
What is generic servlet explain the HttpServlet class in short?
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.
Why HttpServlet class is 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.
In which package HttpServlet class is present?
javax.servlet.http package
The javax. servlet. http package provides classes specific to handling HTTP requests. It provides the HttpServlet class used in this chapter, which implements the appropriate interfaces from javax.
Why is HttpServlet abstract?
What is the difference between HttpServlet and generic Servlet?
The main difference between GenericServlet and HttpServlet is that the GenericServlet is protocol independent that can be used with any protocol such as HTTP, SMTP, FTP, CGI etc. while HttpServlet is protocol dependent and is only used with HTTP protocol.
What is HttpServlet and how it is different from generic Servlet?
-> GenericServlet is a super class of HttpServlet class. -> The main difference is that, HttpServlet is a protocol dependent whereas GenericServlet is protocol independent. So GenericServlet can handle all types of protocols, but HttpServlet handle only HTTP specific protocols.
When to use HttpServlet class in servlet?
The HttpServlet class extends the GenericServlet. It is commonly used when developing servlets that receive and process HttpRequest. Basically, HttpServlet class totally depends on HTTP Request Methods. HttpServlet class implements Http specific methods like doGet (), doPost (), doHead (), doDelete (), doPut () etc.
Which is an abstract class for writing HTTP Servlets?
An abstract class that simplifies writing HTTP servlets. It extends the GenericServletbase class and provides an framework for handling the HTTP protocol. Because it is an abstract class, servlet writers must subclass it and override at least one method.
Is there a subclass of HttpServlet that overrides Doget?
A subclass of HttpServlet must override at least one method, usually one of these: doGet, if the servlet supports HTTP GET requests init and destroy, to manage resources that are held for the life of the servlet getServletInfo, which the servlet uses to provide information about itself
Why is the HTTP POST method used in servlet?
The HTTP POST method allows the client to send data of unlimited length to the Web server a single time and is useful when posting information such as credit card numbers. When overriding this method, read the request data, write the response headers, get the response’s writer or output stream object, and finally, write the response data.