How to forward a request to a JSP using RequestDispatcher ?.

Program to demonstrate working of RequestDispatcher in a servlet for forwarding the request to the correct JSP


subscribe.html


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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Email Subscription</title>
</head>
<body>
 <h1>Join Hubberspot's Fan Club</h1>
 <p>
  In order to join our fan club, enter you name and email address
  below </br> and Click Submit button.
 </p>

 <form action="CustomerInfoDispatcher" method="post">
  <table cellspacing="5" border="0">
   <tr>
    <td align="right">First Name : </td>
    <td><input type="text" name="firstName"></td>
   </tr>
   <tr>
    <td align="right">Last Name : </td>
    <td><input type="text" name="lastName"></td>
   </tr>
   <tr>
    <td align="right">Email Address : </td>
    <td><input type="text" name="emailAddress"></td>
   </tr>
   
   <tr>
    <td></td>
    <td align="left"></br><input type="submit" value="Submit"></td>
   </tr>

  </table>
 </form>
</body>
</html>


CustomerInfoDispatcher.java

package com.hubberspot.jsp.servlets.examples;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.hubberspot.model.Customer;
import com.hubberspot.utility.CustomerService;

@WebServlet("/CustomerInfoDispatcher")
public class CustomerInfoDispatcher extends HttpServlet {



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


    protected void doPost(
  HttpServletRequest request,
  HttpServletResponse response
  ) throws ServletException, IOException {
 // Get the form requests 
 String firstName = request.getParameter("firstName");
 String lastName = request.getParameter("lastName");
 String emailAddress = request.getParameter("emailAddress");
  
 // Using DataModel in a Servlet
 Customer customer = new Customer(firstName, lastName, emailAddress);
  
 // storing the Customer object in the request object
 request.setAttribute("Customer", customer);

 String url = "/customer_info.jsp";
 // forwarding request and response object to a JSP page 
 // Using RequestDispatcher Object
 RequestDispatcher dispatcher = 
   getServletContext().getRequestDispatcher(url);
 dispatcher.forward(request, response);

   }

}


customer_info.jsp


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<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
 pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>

<%@ page import="com.hubberspot.model.Customer" %>

 <h1>Thanks for joining Hubberspot's Fan Club</h1>
 <p>Kindly have a look what you have entered :</p>

<% Customer customer = (Customer)request.getAttribute("Customer"); 
%>

 <table cellspacing="0" cellpadding="5" border="1">
  <tr>
   <td align="right">First Name :</td>
   <%-- Below is the JSP expression used to display string value of an expression --%>
   <td><%=customer.getFirstName()%></td>
  </tr>

  <tr>
   <td align="right">Last Name :</td>
   <td><%= customer.getLastName()%></td>
  </tr>

  <tr>
   <td align="right">Email Address :</td>
   <td><%= customer.getEmailAddress()%></td>
  </tr>
 </table>

 <p>
  To provide correct information, click 'back' on browser window </br>or
  click on Back button below :
 </p>

 <form action="subscribe.html" method="post">
  <input type="submit" value="Back">
 </form>


</body>
</html>


Customer.java

package com.hubberspot.model;

public class Customer {

 private String firstName; 
 private String lastName; 
 private String emailAddress;

 public Customer() {  
  firstName = "";
  lastName = "";
  emailAddress = "";
 }
 
 public Customer(String firstName , String lastName , String emailAddress) {
  this.firstName = firstName;
  this.lastName = lastName;
  this.emailAddress = emailAddress;
 }

 public String getFirstName() {
  return firstName;
 }
 public void setFirstName(String firstName) {
  this.firstName = firstName;
 }
 public String getLastName() {
  return lastName;
 }
 public void setLastName(String lastName) {
  this.lastName = lastName;
 }
 public String getEmailAddress() {
  return emailAddress;
 }
 public void setEmailAddress(String emailAddress) {
  this.emailAddress = emailAddress;
 }
}


Output of the program :


subscribe.html




























customer_info.jsp