What is servlet in Java PPT?
What is servlet in Java PPT?
Request and response through URL Servlets are Java objects which respond to HTTP requests. Servlets may return data of any type but they often return HTML. Servlets are invoked through a URL which means that a servlet can be invoked from a browser. Servlets can be passed parameters via the HTTP request.
What is ServletContext?
Interface ServletContext. public interface ServletContext. Defines a set of methods that a servlet uses to communicate with its servlet container, for example, to get the MIME type of a file, dispatch requests, or write to a log file. There is one context per “web application” per Java Virtual Machine.
What are the problems with servlets?
Here are cons/drawbacks for using servlet:
- One servlet is loaded into JVM.
- When there is a request, there is a thread, not a process.
- Servlet is persistent until it destroys.
- Designing in a servlet is difficult and slows down the application.
- You need a JRE(Java Runtime Environment) on the server to run servlets.
How many ServletContext is available for an application?
one ServletContext object
There is only one ServletContext object per web application.
What’s the difference between servletconfig and servletscontext?
Put email-id as a name-value pair for different servlet inside web.xml which can further be retrieved using getServletConfig ().getInitParameter (“name”) in the servlet. ServletContext is the object created by Servlet Container to share initial parameters or configuration information to the whole application.
How is configuration object used in servlet container?
A servlet configuration object used by a servlet container to pass information to a servlet during initialization. Defines a set of methods that a servlet uses to communicate with its servlet container, for example, to get the MIME type of a file, dispatch requests, or write to a log file.
How to use the Servlet interface in Java?
getServletConfig () method of Servlet interface returns the object of ServletConfig. The init-param sub-element of servlet is used to specify the initialization parameter for a servlet. …… …… In this example, we are getting the one initialization parameter from the web.xml file and printing this information in the servlet.
When to use servletcontext for intializing purposes?
It is used for intializing purposes. The ServletContext parameters are specified for an entire application outside of any particular servlet and are available to all the servlets within that application. It is application scoped and thus globally accessible across the pages.