JSP and Servlet Interaction in Java with an example

Below example shows how to print the data that is retrieved from a Form using a JSP and then passing it to a Servlet for printing it on the GUI.
What components are needed for this ?
  • JSP Page with a form input
  • A Controller 
  • Web Configuration file (web.xml)
JSP Page :

Below is the code for the JSP Page with a Form input. The Form has the below input fields.
  • First name
  • Last name
  • City
The JSP Page code looks like below.

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Welcome Page</title>
 <form action="/Index" method="post">
        <input type="text" name="fname"/><br>        
        <input type="text" name="lname"/>
        <input type="text" name="city"/>                                                                                                                                                                         
        <input type="submit" value="submit">            


Once we have the JSP with the Form data, we need to create the Controller. Below is the code for the controller.

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ControlServlet extends HttpServlet {

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String fname = request.getParameter("fname");
        String lname = request.getParameter("lname");
        String city = request.getParameter("city");
        System.out.println("FirstName :"+ fname);
        System.out.println("Lastname :"+ lname);
        System.out.println("City :"+ city);

Once we have created the Controller, we need to map this in the web.xml file. Below is the code for the web.xml file for the servlet mapping.


Hope this example helps you understand how you can pass the data from the JSP to a Servlet.

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