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Context and Servlet Initialization Parameters 1. Overview Servlets are plain Java classes that run in a servlet container. HTTP servlets (a specific type of servlet) are first class citizens in Java web applications.  The API of HTTP servlets is aimed at handling HTTP requests through the typical request-processing-response cycle, implemented… Continue Reading context-servlet-initialization-param

Java Session Timeout 1. Overview This tutorial will show how to set up session timeout in a Servlet based web application. 2. Global Session Timeout in the web.xml The timeout of all Http Sessions can be configured in the web.xml of the web application: <?xml version=”1.0″ encoding=”UTF-8″?> <web-app …> …… Continue Reading servlet-session-timeout

Returning a JSON Response from a Servlet 1. Introduction In this quick tutorial, we’ll create a small web application and explore how to return a JSON response from a Servlet. 2. Maven For our web application, we’ll include javax.servlet-api and Gson dependencies in our pom.xml: <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>${javax.servlet.version}</version> </dependency> <dependency> <groupId>com.google.code.gson</groupId>… Continue Reading servlet-json-response

Handling Cookies and a Session in a Java Servlet 1. Overview In this tutorial, we’ll cover the handling of cookies and sessions in Java, using Servlets. Additionally, we’ll shortly describe what a cookie is, and explore some sample use cases for it. 2. Cookie Basics Simply put, a cookie is… Continue Reading java-servlet-cookies-session

An Intro to the Spring DispatcherServlet 1. Introduction Simply put, in the Front Controller design pattern, a single controller is responsible for directing incoming HttpRequests to all of an application’s other controllers and handlers. Spring’s DispatcherServlet implements this pattern and is, therefore, responsible for correctly coordinating the HttpRequests to their… Continue Reading spring-dispatcherservlet

web.xml vs Initializer with Spring 1. Overview In this article we’ll cover three different approaches of configuring a DispatcherServlet available in recent versions of the Spring Framework: We’ll start with an XML configuration and a web.xml file Then we’ll migrate the Servlet declaration from the web.xml file to Java config,… Continue Reading spring-xml-vs-java-config

Introduction to Java Servlets 1. Overview In this article, we will have a look at a core aspect of web development in Java – Servlets. 2. The Servlet and the Container Simply put, a Servlet is a class that handles requests, processes them and reply back with a response. For… Continue Reading intro-to-servlets