struts2 interceptor

Interceptor concept: Interceptor is used in AOP (Aspect-OrientedProgramming) to intercept a method or field before it is accessed, and then add some operations before or after it. Interception is an implementation policy of AOP. In the Chinese Document of Webwork, the interceptor is the object for dynamically intercepting Action calls. It provides a mechanism for

Summary: The Interceptor is a very important component of struts2 and an extremely subtle part of struts2. Many functions of struts2 are implemented through these interceptors, such as exception handling, file Upload request parameter assignment, data verification, and other functions are implemented in the

The Interceptor is deployed in almost every program. Therefore, the detailed process of the interceptor configuration is posted, hoping to help you. Detailed configuration process of Struts2 interceptor Zhang zhaozhao You can also set parameters when using t

Struts2 Study Notes --- custom interceptorWhat is an interceptor? In struts2, interceptors are divided into the interceptors defined by Struts2 and custom interceptors. It intercepts an Action before it is executed, and adds some operations after the Action is executed.Implementation Principle When an Action is request

Interceptor systemIs an important part of the struts2 framework, a large numberBuilt-in interceptorCompleted most of the operations on the framework. For exampleParamsThe Interceptor is responsible for parsing HTTP Request Parameters and setting Action attributes;ServletconfigThe interceptor directly transmits the http

1. Interceptor: the interceptor is the core of struts2, and all functions of struts2 are implemented through the interceptor. 2. interceptor Configuration: 1) Write a class that implements the

Interceptor) is the core component of Struts 2. A lot of features) are built on the interceptor, such as file upload and download, internationalization, converter and data validation, Struts 2 uses the built-in interceptor, completed most of the operations in the framework. In Struts 2, the interceptor is interpreted a

Preface As mentioned earlier, the interceptor can only intercept action. Here, the interceptor calls reflect the responsibility chain mode. Why does it reflect the responsibility chain model? The following is a clear explanation: Struts2 divides the entire execution into several elements of the same type. Each element has different logical responsibilities and

For example, if you often need to obtain the user currently logged on in the action, you need to obtain the session and then the user currently logged on from the session, because these steps are repeated, you can find a way to implement it in the Interceptor. You can customize an interface. As long as your action implements this interface, inject it in the Custom interceptor. That is, get the session from