How to add a new Servlet to Tomcat Web.xml?

Goto conf\web.xml and add the servlet and servlet-mapping.

Example:

 <servlet>

    <servlet-name>AjaxServlet</servlet-name>

    <servlet-class>com.edu.FirstServlet</servlet-class>

  </servlet>

  <servlet-mapping>

    <servlet-name>FirstServlet</servlet-name>

    <url-pattern>/svlt/*</url-pattern>

  </servlet-mapping>