How do I map a servlet in WEB xml?

How do I map a servlet in WEB xml?

To map a URL to a servlet, you declare the servlet with the element, then define a mapping from a URL path to a servlet declaration with the element.

What is URL pattern in WEB xml file?

The url-pattern element of a servlet-mapping or a filter-mapping associates a filter or servlet with a set of URLs. When a request arrives, the container uses a simple procedure for matching the URL in the request with a url-pattern in the web. xml file.

What is filter-mapping in WEB xml?

The filter-mapping element maps a URL pattern or servlet name to an instance of a filter. The filter-mapping always contains a filter-name element and a url-pattern element. The filter-name element must match a filter-name defined in a filter element elsewhere in the web. xml file.

What is the use of 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 are the 3 ways of creating a servlet program explain with syntax?

There are three ways to create the servlet.

  • By implementing the Servlet interface.
  • By inheriting the GenericServlet class.
  • By inheriting the HttpServlet class.

Can servlet mapping have multiple URL patterns?

Although different patterns can map to the same servlet, the same pattern cannot map to two different servlets. If the same url-pattern appears more than once within a web.

What is filter in servlet example?

A filter is an object that is invoked at the preprocessing and postprocessing of a request. It is mainly used to perform filtering tasks such as conversion, logging, compression, encryption and decryption, input validation etc. The servlet filter is pluggable, i.e. its entry is defined in the web.

What is the difference between INIT param and context-param?

Servlet init parameters are for a single servlet only. Nothing outside that servlet can access that. It is declared inside the tag of Deployment Descriptor, on the other hand context init parameter is for the entire web application. Any servlet or JSP in that web application can access context init parameter.

How do you write a servlet that is part of a web application?

By implementing Servlet interface, By inheriting GenericServlet class, (or) By inheriting HttpServlet class….The steps are as follows:

  1. Create a directory structure.
  2. Create a Servlet.
  3. Compile the Servlet.
  4. Create a deployment descriptor.
  5. Start the server and deploy the project.
  6. Access the servlet.

What is URL re write explain with example?

URL rewriting is the process of modifying Uniform Resource Locators (URLs) for various purposes. The URL as a “web address” is a string that, when entered into the browser bar field, directs the browser to move to a given site and page.

In which file do we define a servlet mapping?

It is located in WEB-INF directory of the web application. servlet-mapping has two child tags, url-pattern and servlet-name. url-pattern specifies the type of urls for which, the servlet given in servlet-name should be called.