Summary of Interceptors (interceptor) in Struts2

What is an interceptor?

The Interceptor in Java is the object that dynamically intercepts the action call. It provides a mechanism to enable developers to define code that executes before and after an action executes, or to prevent it from executing before an action executes, and also provides a way to extract the reusable parts of the action. In AOP (aspect-oriented programming), interceptors are used to intercept a method or field before it is accessed, and then add some actions before or after it. The Struts2 contains a number of interceptors, each of which completes a relatively independent function, and multiple interceptor combinations become interceptor stacks. The most important interceptor stack is the system default interceptor stack Defaultstack. The STRUTS2 defines 35 interceptors by default and performs 20 by default.

Workflow Interceptor Source Code Analysis

View the Dointercept () method of the Defaultworkflowinterceptor class:

Default error View:

Registration of Interceptors:

How to register the Interceptor stack:

How to register the default interceptor:

Last word: Interceptors are executed in the same order as they were registered

Summary of Interceptors (interceptor) in Struts2