2. Create a servlet inside the src folder.

Right click on the src folder and select 'New > Servlet' or 'New > Other > Web > Servlet'.

Enter the below details:

• Java package: com.javajee.servletdemo

• Class name: HelloWorldServlet

• Note that Superclass will be already filled with the value 'javax.servlet.http.HttpServlet'. We will see about servlet class hierarchies soon.

Click finish.

Your servlet class will have a basic structure as:

package com.javajee.servlets;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

 

@WebServlet("/HelloWorldServlet")

public class HelloWorldServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

    public HelloWorldServlet() {

        super();

    }

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

}

}

Note that you have used the annotation @WebServlet("/HelloWorldServlet") to tell that this is a servlet and also have specified the url pattern inside. You can replace this annotation by configuring the servlet and servlet mapping in a web.xml file as:

  <servlet>
  <description></description>
  <servlet-name>HelloWorldServlet</servlet-name>
  <servlet-class>com.javajee.servlets.HelloWorldServlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
  <servlet-name>HelloWorldServlet</servlet-name>
  <url-pattern>/HelloWorldServlet</url-pattern>
  </servlet-mapping> 

3. Now just add the below code to the doGet method:

4. Now right click HelloWorldServlet.java and execute it on server: 

select Run As > Run on Server

> Select Tomcat (Make sure status is started) and click Next

>  Make sure your project is there on the right side under 'Configured'. If project is not under 'Configured, but under 'Available', then select the project under 'Available', click 'Add' and move it to 'Configured' and click Next. If your project is not under both 'Configured' and 'Available', then something has gone wrong. Check if you have followed all the steps correctly.

> Finally click finish and your servlet will be loaded in the eclipse browser. You will be prompted to restart server and select restart server option only.