Implementation of Java Servlets

Introduction

This article explains how to implement a Servlet in the Netbeans IDE. The Netbeans IDE is used for the development of the example. 

What is Servlet

A Servlet is basically a Java class that extends the features of servers, Servlets are normally used to extend the applications hosted by the web servers.

Features of Servlet

Persistent

This features enables the servlet to handle multiple requests, it can handle multiple requests after the servlet is loaded in the web server memory.

Fast

The Servlet provides quick response to the client request.

Platform Independent

Servlets are platform independent, in other words they can run on any hardware.

Efficient

The feature of handling multiple client requests makes a servlet more efficient than other server-side technologies.

Portable

A Servlet can run on various platforms, this makes servlets portable.

Advantages

The advantages of Servlets are:

• Powerful
• Safety
• Extensibility
• Integrity
• Inexpensive
• Secure
• Performance

Disadvantages of Servlet

The  disadvantages of Servlets are:

• The Java Runtime Environment (JRE) is required on the server to run the servlet.
• Designing a servlet is complex.
• The Web administrator will need to learn how to install and maintain servlets.

Example

In this example; we discuss how to implement a servlet in the Netbeans IDE. There is a certain procedure in the Netbeans IDE that we need to follow as explained below.

Step 1

Open the Netbeans IDE.

Step 2

Click on "File" from the Menu bar as in the following:

Step 3

Click on "New Project" as in the following:

Step 4

Select "Java Web" and "Web application" as in the following:

Step 5

Click on "Next" as in the following:

Step 6

Instead of project name specify "ServletDemo" and instead of project location specify the path where you want to store your project and click on "Next".

Step 7

Select the server by which you want to run your project and than click on "Next" as in the following:

Step 8

Click on "Finish" as in the following:

Step 9

Right-click on "Project" -> "ServletDemo" then  select "New" then select "Servlet" as in the following:

Step 10

Now provide the class name (as given New) and then click on "Next" as in the following:

Step 11

Click on "Finish" as in the following:

Step 12

Now write the Servlet code as in the following:

Step 13

Now go to "New.java" and right-click on that, click on "Run" from the menu bar as in the following:

Step 14

A window will appear click on "ok" as in the following:

Output

The output will appear on your browser as in the following: