What Is Difference Between ServletConfig And ServletContext?

The servletconfig object refers to the single servlet whereas servletcontext object refers to the whole web application. For understanding, this is like a application global variable mechanism for a single web application deployed in only one JVM. The ServletContext object is contained within the ServletConfig object.


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.

what is ServletConfig and ServletContext with example?

The ServletConfig parameters are specified for a particular servlet and are unknown to other servlets. 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.

What is param value in Web XML? The context-param element, subelement of web-app, is used to define the initialization parameter in the application scope. The param-name and param-value are the sub-elements of the context-param. The param-name element defines parameter name and and param-value defines its value.

what is difference between GenericServlet and HttpServlet?

-> 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.

What is Servlet name in Web XML? The web. xml file is located in the WEB-INF directory of your Web application. The first entry, under the root servlet element in web. xml, defines a name for the servlet and specifies the compiled class that executes the servlet. xml, under the servlet-mapping element, defines the URL pattern that calls this servlet.

what is ServletConfig?

ServletConfig is an object containing some initial parameters or configuration information created by Servlet Container and passed to the servlet during initialization. ServletConfig is for a particular servlet, that means one should store servlet specific information in web. xml and retrieve them using this object.

What is Session Tracking? Session Tracking is a way to maintain state (data) of an user. It is also known as session management in servlet. Http protocol is a stateless so we need to maintain state using session tracking techniques. Each time user requests to the server, server treats the request as the new request.

What is the use of Servlet config?

Servlet Container creates ServletConfig object for each Servlet during initialization, to pass information to the Servlet. This object can be used to get configuration information such as parameter name and values from deployment descriptor file(web. xml).

What is ServletContext object? ServletContext is a configuration Object which is created when web application is started. It contains different initialization parameter that can be configured in web. xml. The servlet context is an interface which helps to communicate with other servlets.

What is context param in Web XML?

The “context-param” tag is define in “web. xml” file and it provides parameters to the entire web application. For example, store administrator's email address in “context-param” parameter to send errors notification from our web application.

What is Getservletcontext in Java?

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 is init param?

<init-param> This tag provides parameters to a single servlet or filter. See advantages of specifying parameter values in web. A single <init-param> tag is used for each parameter. The actual parameter name and value are set using <param-name> and <param-value>.

What is JSP life cycle?

JSP Life Cycle is defined as translation of JSP Page into servlet as a JSP Page needs to be converted into servlet first in order to process the service requests. The Life Cycle starts with the creation of JSP and ends with the disintegration of that.

What is Servlet interface in Java?

Interface Servlet. All Known Implementing Classes: GenericServlet public interface Servlet. Defines methods that all servlets must implement. A servlet is a small Java program that runs within a Web server. Servlets receive and respond to requests from Web clients, usually across HTTP, the HyperText Transfer Protocol.

What is Web container in Java?

Web container also known as a Servlet container is the component of a web server that interacts with Java servlets. A web container is responsible for managing the lifecycle of servlets, mapping a URL to a particular servlet and ensuring that the URL requester has the correct access rights.

What is difference between SendRedirect and RequestDispatcher?

The RequestDispatcher interface allows you to do a server side forward/include whereas sendRedirect() does a client side redirect. SendRedirect() will search the content between the servers. its the server side process and it is faster compare to the SendRedirect() method.

What is servlet context and config?

The servletconfig object refers to the single servlet whereas servletcontext object refers to the whole web application. That is, you can pass initialization parameters to the servlet using the web. xml deployment descriptor. For understanding, this is similar to a constructor in a java class.

What is filter in Servlet?

A filter is an object that performs filtering tasks on either the request to a resource (a servlet or static content), or on the response from a resource, or both. Filters perform filtering in the doFilter method.

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