servlets annotations
Servlet annotations are a way to declare Servlets and their properties in a more concise and flexible manner than using XML deployment descriptors. Annotations are introduced in Java EE 5 and are used extensively in Java EE 6 and later versions.
Here are some commonly used Servlet annotations:
@WebServlet: This annotation is used to declare a Servlet and its properties. The annotation can be used to specify the URL pattern, the Servlet name, the init parameters, and other properties.
@WebFilter: This annotation is used to declare a filter and its properties. The annotation can be used to specify the URL pattern, the filter name, the order of execution, and other properties.
@WebListener: This annotation is used to declare a listener and its properties. The annotation can be used to specify the event types that the listener is interested in, the listener name, and other properties.
@WebInitParam: This annotation is used to specify an initialization parameter for a Servlet, filter, or listener. The annotation can be used to specify the name and value of the parameter.
@MultipartConfig: This annotation is used to configure a Servlet to handle multipart/form-data requests. The annotation can be used to specify the maximum file size, the location for storing uploaded files, and other properties.
Using annotations can simplify the deployment process for Servlets, filters, and listeners. Annotations provide a more concise and flexible way to declare these components and their properties than using XML deployment descriptors. Additionally, annotations can be used to provide metadata for other Java EE components, such as EJBs and JMS resources.