java interceptor

;Public String Interceptor (actioninvocation Invocation) throws exception { // Before calling the execute () method String result = invocation. Invoke (); // After the execute () method is called Return result; } Note: (1) When using a custom interceptor, the default built-in interceptor is lost. Therefore, you must explicitly reference the default

using interceptors In web development we often encounter paging operations, a project may have more than one use to paging, then if the Java background using MyBatis as a persistence layer, we can use the MyBatis interceptor function to complete the entire project in multiple paging operations, reduce the code redundancy. Interceptor Code Intercept the Prepare m

interceptor is based on the Java reflection mechanism, and the filter is based on function callback.2. The filter depends on the servlet container, and the interceptor does not rely on the servlet container.3. the interceptor can only work on Action requests, while the filter can work on almost all requests.4. the

The Java Web Project uses the structure of the spring+spring mvc+hibernate, and the methods in the controller are used to process the front-end access information. The controller returns a Modelandview object to the front end or only JSON-formatted data by invoking the service for business processing. It is convenient for development and debugging if you can get information about HTTP requests that are processed in the backend program.

proxy object that makes different processing based on the customer's needs. For the customer, just know a proxy object on the line. In that Struts2, how is the interceptor invoked through a dynamic proxy? When the action request arrives, an action proxy object is generated by the agent of the system, which invokes the action's execute () or the specified method, and finds the interceptor corresponding to t

) and Interceptor (Interceptor), so Google. Boven Introduction: 1, interceptors are based on the reflection mechanism of Java, and filter is based on function callback.2. The filter relies on the servlet container, while the interceptor is not dependent on the servlet container.3. Interceptors only work on action reque

One, overview This article is mainly about how to customize the interceptor and through the custom interceptor to understand the interceptor lifecycle. Two, custom Interceptor 1) write an Interceptor class Hellointerceptor, which implements the

divide and conquer, so that each part of the logic can be highly reusable and highly scalable. Therefore, interceptor structure is really the essence of the struts2/xwork design of the pen. Definition of interceptor Execution Analysis interceptor Let's take a look at the definition of Interceptor interface:

We have introduced some interceptor configurations and basic usage methods. So this time we will introduce the practical functions of the interceptor. The utility interceptor completes permission control. When a visitor needs to perform an operation, the application must first check whether the visitor is logged on and whether there are sufficient permissions

request ends , my interceptor gets the session data from the request, verifies that the user is logged in, if flag is true, returns False;2.posthandle (Request,response,handle, Modleandview): Explained by the Prehandle method we know that this method, including the Aftercompletion method that is to be mentioned later, can only be called if the return value of the Prehandle method of the current owning interceptor