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HttpSessionAttributeListener is a listener interface from Servlet API. Implementation of this listener will be notified when an attribute is added, removed and replaced in session scope. Using this we can track all the attributes of session scope. The listener have three methods as shown in below source code. attributeAdded(.) : It is invoked when an […]

Annotation based programming model simplifies and reduces configuration in project. Annotation is nothing but a meta-data. Generally we define meta-data in xml file. The same meta-data can be declared through Java Annotation (no xml required). Servlet3.0 and later version support Servlet development through Annotation, and avoid the configuration in web.xml file. Below code demonstrates the […]

Here we learn how to upload a file in JSP/Servlet web application with the help of Apache Commons Library. This program is using 2 jar files : commons-fileupload.jar commons-io.jar Add both jar files in project classpath (or library) The below image is showing project directory structure and required files: index.jsp : Form to select file […]

Struts is a Open-Source Java Web Application Development Framework based on MVC (Model-View-Controller) design pattern. It is one of the oldest and mature web application development framework. Various web applications are using Struts for there web portals development. We can say that various applications are powered by Struts MVC architecture. Struts is based on JSP […]

Browser has a feature to cache (storing in advance) some data (html pages, dynamic response, images, css, JavaScript files etc) to improve the performance in web application. So that when the same data or page is requested by client, browser will provide it from cache without sending request to server. When we send a request […]