JSP Actions are XML-like tags that encapsulate functionality to perform specific tasks within JSP pages, thereby controlling the behavior of the servlet engine. They are used to directly manipulate the generation of the servlet that the JSP page compiles into, without the need to embed large blocks of Java code within the JSP page itself. This helps in keeping the presentation layer separate from the business logic, making the code cleaner and more maintainable.
JSP Actions are predefined and provide functionalities such as:
Dynamic insertion of a file: Including content from another resource dynamically at request time.
Controlling behavior of the servlet engine: Managing JavaBeans components, sharing data among pages, etc.
Forwarding a user to another page: Redirecting the request to another resource, which could be a static page, another JSP page, or a servlet.
Controlling flow between pages: Managing the flow of control between pages or different parts of a page.
The common syntax for JSP Actions is:
<jsp:action_name attribute="value" />
There are several standard JSP Action tags, including but not limited to:
<jsp:include>: Includes another resource at request time.
<jsp:forward>: Forwards the request to another resource.
<jsp:useBean>: Finds or instantiates a JavaBean component.
<jsp:setProperty>: Sets the property of a JavaBean component.
<jsp:getProperty>: Retrieves the property value of a JavaBean component and includes it in the response.
<jsp:plugin>: Embeds applets or JavaBeans in the generated page.
Each JSP Action tag can have attributes that provide additional information about how the action should be performed. For example, the <jsp:forward> tag has an attr...
