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package ru.jf17.demo;

import java.io.PrintWriter;
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(name = "HelloServlet", urlPatterns = {"/hello"})
public class HelloServlet extends HttpServlet {
 
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         
        response.setContentType("text/html");
        PrintWriter writer = response.getWriter();
        try {
            writer.println("<h2>Hello from HelloServlet</h2>");
        } finally {
            writer.close();  
        }
    }
}

    <servlet>
        <servlet-name>HelloServlet</servlet-name>
        <servlet-class>ru.jf17.demo.HelloServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>HelloServlet</servlet-name>
        <url-pattern>/hello</url-pattern>
   </servlet-mapping>