Spring and Struts can be integrated in several ways. At their core, these two technologies are based on the same principle of Model-View-Controller architecture, but they achieve it with different methodologies. In order to integrate Spring and Struts, the most obvious solution is to use an adapter class that implements both frameworks. The adapter acts as a bridge between the two, allowing them to communicate with one another. For example, when a request is made from a Struts application via an HTTP POST or GET request, it can then be handled by the appropriate controller defined in Spring MVC. This integration allows for increased efficiency, validation capabilities and better control over the mapping of request controllers. In addition, it grants developers greater flexibility in how their applications are structured. By integrating Struts and Spring MVC through an adapter class, developers can take advantage of all the features offered by each framework while maintaining compatibility with both technologies. This integration results in applications that are faster and more reliable while providing end users with a smoother experience overall.