### Relevant Articles:
- [Introduction to Java Servlets](http://www.baeldung.com/intro-to-servlets)
- [An MVC Example with Servlets and JSP](http://www.baeldung.com/mvc-servlet-jsp)
- [Handling Cookies and a Session in a Java Servlet](http://www.baeldung.com/java-servlet-cookies-session)
- [Uploading Files with Servlets and JSP](http://www.baeldung.com/upload-file-servlet)
- [Example of Downloading File in a Servlet](http://www.baeldung.com/servlet-download-file)
- [Returning a JSON Response from a Servlet](http://www.baeldung.com/servlet-json-response)