Java Servlets

Servlets are programs that help in building applications that generate dynamic Web pages (HTML, XML). Servlets are a Java-equivalent of the CGI scripts and can be thought of as a server-side counterpart to the client-side Java applets.

Servlets are Java classes that implement a specific interface and produce HTML in response to GET/POST requests.

In an OOM, a servlet is represented as a component, it is linked to a servlet class that implements the required interface and provides the servlet implementation.

When you set the type of the component to Servlet, the appropriate servlet class is automatically created, or attached if it already exists. The servlet class is initialized so that operations are automatically added.

• Servlet Page of the Component
  When you set the type of the component to Servlet, the Servlet page is automatically displayed in the component property sheet.
• Defining Servlet Classes
  Servlet classes are identified using the <<ServletClass>> stereotype.
• Creating a Servlet with the Wizard
  You can create a servlet with the wizard that will guide you through the creation of the component. The wizard is invoked from a class diagram. It is only available if the language is Java.
• Understanding Servlet Initialization and Synchronization
  When creating a servlet, the initialization process instantiates the servlet class together with its methods.
• Generating Servlets
  The generation process retrieves all classes used by the servlet components to generate the servlets.
• Generating WARs
  You can package servlets and JSPs into a .WAR file.
• Reverse Engineering Servlets
  You can reverse engineer servlet code and deployment descriptor into an OOM. The reverse engineering feature reverses the Java class as a servlet class, it reverses the servlet as a component, and associates the servlet class with this component. The reverse engineering feature also reverses the deployment descriptor and all the files inside the WAR.