I just started how to learn how to program a Java Servlet so the basic program that I wrote is the famous hello world program with a simple math functions in Java like square root and cube root. In this program I am using Eclipse as my text editor and Apache Tomcat 8.0 as my web server. This program is very simple yet is show you how to write a simple Java servlet that is the fundamentals of any web applications written in Java.
If you have some questions please send me an email at jake.r.pomperada@gmail.com and jakerpomperada@yahoo.com. My mobile number here in the Philippines is 09173084360.
Sample Program Output
Program Listing
package company.helloworld.servlets;
import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class HelloWorld
*/
@WebServlet("/HelloWorld")
public class HelloWorld extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public HelloWorld() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
double sqrtvalue = Math.sqrt(144.0);
double cuberoot = Math.cbrt(8.0);
out.println("<html><body> <font color='green'> <h1 align='center'>Hello World Servlet </h1> "
+ "The square root of 144 is " + sqrtvalue
+ "<br>The cube root of 8 is " + cuberoot + "</font> </body></html>");
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
