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How to use various types of JSP tags in a JSP page ?

Program to demonstrate usage of various JSP tags in a JSP page

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 Email list</h1>
 <p>
  In order to join our email list, enter you name and email address
  below </br> and Click Submit button.
 </p>

 <form action="email_entry.jsp" method="get">
  <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>


email_entry.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>Email Subscription</title>
</head>
<body>

<h2>The five types of JSP tags are as follows : </h2>

 <table cellspacing="0" cellpadding="5" border="1">
  <tr>   
   <th>Tag Name</th>
   <th>Tag Symbol</th>
   <th>Tag Usage</th>
  </tr>

  <tr>
   <td>JSP comment</td>
   <td>&lt;%-- --%&gt;</td>
   <td>JSP engine ignores code between this tag</td>
  </tr>

  <tr>
   <td>JSP directive</td>
   <td>&lt;%@ %&gt;</td>
   <td>JSP engine uses it as metadata for entire JSP page</td>
  </tr>
  
  <tr>
   <td>JSP expression</td>
   <td>&lt;%= %&gt;</td>
   <td>JSP engine uses it for displaying string value of evaluated expression</td>
  </tr>
  
  <tr>
   <td>JSP declaration</td>
   <td>&lt;%! %&gt;</td>
   <td>JSP engine uses it as for declaring instance variables and methods</td>
  </tr>
  
  <tr>
   <td>JSP scriptlet</td>
   <td>&lt;% %&gt;</td>
   <td>JSP engine uses it to insert block of Java statements</td>
  </tr>
 </table>
 
 
 <%-- This is comment tag , generally ignored by JSP engine --%>

 <%-- Below is the directive tag , used as a meta-data for entire JSP--%>
 <%@ page import="com.hubberspot.model.Customer"%>
 <%@ page import="java.io.*"%>



 <%-- Below is the JSP declaration tag used to declare methods and instance variables --%>
 <%!
       int counter = 0;
 
    public void write(Customer customer, String filePath) {
   try {

    File file = new File(filePath);
    FileWriter writer = new FileWriter(file);
    PrintWriter out = new PrintWriter(writer);
    
    String firstName = customer.getFirstName();
    String lastName = customer.getLastName();
    String emailAddress = customer.getEmailAddress();
    
    out.println("First Name : "+ firstName+"n" );
    out.println("Last Name : "+ lastName+"n" );
    out.println("Email Address : "+ emailAddress+"n" );
    out.close();
   } catch (IOException e) {   
    e.printStackTrace();
   }
   

  }  
   %>

 <%-- Below tag is the JSP Scriptlet tag which is used for inserting block
of java statements  --%>
 <%
  // Get the form requests 
  String firstName = request.getParameter("firstName");
  String lastName = request.getParameter("lastName");
  String emailAddress = request.getParameter("emailAddress");

  // Get the complete real path for subscription.txt
  ServletContext context = request.getServletContext();
  String filePath = context.getRealPath("/WEB-INF/subscription.txt");

  // Using DataModel in a JSP
  Customer customer = new Customer(firstName, lastName, emailAddress);

  // Using the this to write info to file
  this.write(customer, filePath);
 %>

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

 <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>



Output of the program :


1. subscribe.html


























 2. email_entry.jsp






 3. subscription.txt

 

 
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