What is the purpose of a Java interceptor?

In the Java programming language, interceptors are utilized to intercept and handle specific requests or events during program execution. These interceptors can be used to implement various functionalities such as permission verification, logging, performance monitoring, and more. By defining specific logic within the interceptors, requests or events can be processed at different stages of the program, enabling control and management of the system. Interceptors can be applied in various frameworks and technologies, including Spring MVC, Servlet, and Struts.