java interceptor

terminates (ends) by calling the Destroy () method:Executes only once, and executes the method when the server-side stops and unloads the servlet, somewhat similar to the C + + Delete method. A servlet may produce additional threads when running the service () method, so it is necessary to confirm that the threads have been terminated or completed when the Destroy () method is called.The life cycle of the servlet also needs to be preceded by a process of loading and instantiating the servlet(re

Java codeMany people know about filters and have heard of interceptors. However, if you really cannot tell the differences between filters, You can briefly describe them:1. the interceptor is based on the java reflection mechanism, and the filter is based on the function callback.2. The filter depends on the servlet container, while the

application,session,request three object is created or is added to a modified delete property. For example, Spring's director listener will instantiate our configured Bean object when the server starts, Hibernate session listener will listen to the session activity and life cycle, responsible for creating, closing session and other activities.The servlet listener listener, which is a server-side program that implements the Javax.servlet.ServletContextListener interface, is launched with the lau

Dynamic resources and static resources Interceptor can be regarded as an AOP implementation, specifically to intercept the dynamic resources of the background request, that is, interception of the control layer request, mainly used to determine whether the user has permission to request the background. Interceptors do not intercept static resources, such as the default static directory resources/static for spring boot, request Html,js in its directory

I. Introduction of interceptors Spring MVC's processor interceptors are similar to filter filters in servlet development for preprocessing and post-processing of processors. Common Application Scenarios 1, log records: Log the request information for information monitoring, information statistics, calculation of PV (Page View) and so on.2, permission check: such as login detection, enter the processor detection detection is logged in, if not directly back to the login page;3, performance monito

Most web-side projects will use the "permissions" This thing, first of all to understand that the permissions are tied to the role, that is, the corresponding relationship, permissions: Role =n:1.Since there is a need for permission, then the interceptor naturally cannot be absent.1. Interceptor configuration file (Struts.xml):2.java code (Class):@ParentPackage (

Previously, when using struts1, we used the write filter to handle garbled characters. We moved the written filter to struts2, and configured web. XML to have no effect, so the request did not pass the filter at all. Originally, struts2configured the filter to process the action request in web.html: After using this sturts filter, the configuration before or after this struts filter finds that the filter for processing garbled characters does not work, so writing the

First, let's look at the features and implementations of Spring MVC Interceptor:Http://wenku.baidu.com/link?url=Mw3GaUhCRMhUFjU8iIDhObQpDcbmmRy_ Ipeumazg0ppnbmwqfutlp9kspupppeysf6enhblyfewrbjqmq8blwkqz_7msdhgqtvl32fpxcmmThe Interceptor interceptor in SPRINGMVC is also very important and useful, and its main function is to intercept the user's request and do the corresponding processing, other functions such

I. Introduction of InterceptorsThe interceptor in the SPRINGMVC, in simple terms, isInterception of user requests, we can do it after the interception request.preprocessing and post-processing, you can do the logging, permission control, request calculation and other operations. And the filter in the Servlet API is a bit similar.Second, the use of interceptors1. Writing interceptorsWe have to write the interceptor