In this article, I will explain When and How to Use Servlet Annotations. In fact, the Servlet version 3.0 introduces the concept of annotations. As a result, it is no longer required to use only the web.xml file for configuring the servlets. Hence, we have now annotations to configure various components of the servlet. Accordingly, IDEs like Eclipse have the support of […]
This article explains Creating Deployment Descriptor in a Dynamic Web Project in Eclipse JEE. Basically, a deployment descriptor is called web.xml and contains configuration information regarding a dynamic web application. However, when we create a dynamic web project in Eclipse IDE, the web.xml file is not available by default. Therefore, we need to create this file explicitly. Steps for Creating […]
This article explains Registering a Servlet in Deployment Descriptor. Basically, registering a servlet in the deployment descriptor requires providing the <servlet> tag in the web.xml file. Also, within this tag, the <servlet-name>, and <servlet-class> tags specify the name of servlet and associated java class respectively. Additionally, we can also specify <init-parameter> tags to provide the initialization parameters for a servlet. […]
Basically, a deployment descriptor refers to a configuration file in a web application. Whenever we create a J2EE application, it includes web components comprising of servlets and JSP files, For the purpose of managing the dynamic web application, we can create a web.xml file. In fact, the web.xml is our deployment descriptor. This web.xml file contains information regarding URL mapping, registering servlets, […]
In this article, I will explain Servlet and its Life Cycle. To begin with, let us first understand what a servlet is. What is a Java Servlet? In fact, the java servlet is a technology to create dynamic web pages. In short, servlets are classes that reside on a web server or application server. Furthermore, a webserver executes a servlet whenever […]
Since, a web page contains a form to get data from the users, the Input Parameters in a Servlet are received from the HTML form. Basically, an HTML form contains various input elements like textbox, checkbox, dropdownlist, radio buttons and so on. In order to pass the values entered by the user, these input elements must have the name attribute […]
In this article on Creating a Simple HTTP Servlet, I will explain writing the code of your first servlet using the Eclipse IDE. Basically, a servlet is nothing but a java class that serves the purpose of extending the capabilities of a server. Furthermore, a servlet handles the request and response operations. Steps for Creating a Simple HTTP Servlet The […]
Interfaces in Java provide us a way to declare the functionality that can be implemented by different classes in their own way. In general, an interface represents a contract. Basically, it is a contract between different groups of people in the software industry where the groups want to agree on how the software should behave. Therefore, the interface contains information regarding what […]
In this article, I will explain Creating Arrays in Java. To begin with, let us first understand what an array is. Basically, an array represents a collection of elements. So, an array can contain multiple values of the same data type. Additionally, all elements in an array occupy the contiguous locations in memory. Further, all the elements of an array […]
This article demonstrates several Examples of For-each Loop in Java. In fact, the use of for-each loop makes traversing the elements of a collection much simplified. The following code shows a simple example of displaying the elements of an array using the for-each loop. As can be seen, there is no loop control variable to track the array index. In […]