What is the return type of Getlast modified method of HttpServlet?
Returns the time the HttpServletRequest object was last modified, in milliseconds since midnight January 1, 1970 GMT. If the time is unknown, this method returns a negative number (the default).
Which method do not used by HttpServlet?
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.
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.
What is Java servlet HTTP HttpServlet?
javax.servlet.GenericServlet | +—-javax.servlet.http.HttpServlet public abstract class HttpServlet extends GenericServlet. An abstract class that simplifies writing HTTP servlets. It extends the GenericServlet base class and provides an framework for handling the HTTP protocol.
What type of servlets use these methods?
The difference between Servlets and JSP is the ……………….
| Q. | What type of servlets use these methods doGet(), doPost(),doHead, doDelete(), doTrace()? |
|---|---|
| C. | all of the above |
| D. | none of the above |
| Answer» b. httpservlets |
What are the methods of HttpServlet?
HttpServlet methods
| Methods | Description |
|---|---|
| void doDelete(HttpServletRequest req, HttpServletResponse res) | This method allows a Servlet to handle the delete request. |
| void doOptions(HttpServletRequest req, HttpServletResponse res) | This method allows a Servlet to handle the options request. |
What is the difference between GenericServlet and HttpServlet?
-> 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.
Is HttpServlet an 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.
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 method in session tracking is used?
There are four techniques used in Session tracking: Cookies. Hidden Form Field. URL Rewriting.
When Init method of servlet get called?
8. When init() method of servlet gets called? The init method is created to be called only once. When servlet is first loaded into memory,that time the call goes to the init method,and just because it is loaded once so it is not called again for each user request.
How to create a class for HTTPServlet in Java?
1. protected void doGet (HttpServletRequest req, HttpServletResponse resp): This method is called by servlet service method to handle the HTTP GET request from client. 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.
What does the service method do in HTTPServlet?
Called by the server (via the service method)”to allow a servlet to handle a GET request. Overriding this method to support a GETrequest also automatically supports an HTTP HEAD request. iii. protected void doHead (HttpServletRequest req,HttpServletResponse resp)
What does the abstract class in HTTPServlet do?
Does nothing, because this is an abstract class. Called by the server (via the service method) to allow a servlet to handle a GET request. Overriding this method to support a GET request also automatically supports an HTTP HEAD request. A HEAD request is a GET request that returns no body in the response, only the request header fields.
Can a subclass of HttpServlet override a method?
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: