Here is an example of using a filter to intercept requests and modify the content of a JSP page before it is served to the client’s browser:

In the above example, of the SeoFilter class implements the Filter interface, which allows it to intercept requests before they are processed by the JSP page. The doFilter method is called for each incoming request, and it modifies the content of the JSP page by setting attributes in the HttpServletRequest object. These attributes can be used in the JSP page to generate meta tags or other SEO-related content.

To use this filter in a JSP website, you would need to configure it in the web.xml file, like this:

This configuration tells the web server to use the SeoFilter class to intercept all incoming requests (<url-pattern>/*</url-pattern>), and modify their content before it is served to the client’s browser.