Servlet

A simple servlet can look like:

	
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;


1. public class FirstServlet extends HttpServlet {

2.   public void doGet(
3.          HttpServletRequest request, HttpServletResponse response)
4.          throws ServletException, IOException {


5.   PrintWriter out = response.getWriter();
6.   out.println("The First Servlet Worked !");
     }
   }

Note: Line numbers in the above example are used for clarity and are not part of the syntax

Refer to appendix A to know more about compiling and executing Servlets and the HTML syntax.

If you 'link' to this servlet from your browser, it will come back to you with this message:

The First Servlet Worked !

Explanation of the code:

The first three import statements are pretty much standard .. to import the required classes.

Line 1: your Servlet should extend HTTPServlet to inherit the HTTP specific properties & methods.
Line 2: The HTTP Get request is passed to the doGet method (similarly the HTTP POST request is passed to doPost).
Line 3: defines the standard parameters passed to doGet & doPost methods.
Line 4: completes the signature of doGet.
Line 5 & 6 are self explanatory .. just print the stuff !

A Brief Introduction to Servlets and JSP
Building Web Applications Using Servlets and JSP
The Next Servlet: The Request and the Response