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This article mainly explains "Spring interceptor implementation HandlerInterceptor interface code analysis", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let Xiaobian take you to learn "Spring interceptor implementation HandlerInterceptor interface code analysis"!

Spring HandlerMapping supports interceptors, which must implement the HandlerInterceptor interface, which has the following three methods:

1.preHandle() is called before the processor is executed. The method returns true to indicate that other interceptors or processors will continue to be called. The method returns false to indicate that the flow is interrupted and subsequent interceptors and processors will not be executed.

2. PostHandle () is invoked before view execution after processor execution, at which point data model data or views have been processed through ModelAndView objects.

3.afterCompletion() is called after the whole process is over, for example, in performance monitoring, we can record the end time and output the consumed time here, or we can write the cleanup of resources here, but only when preHandle() returns true will the afterCompletion method be executed.

public class someInterceptor implements HandlerInterceptor{ public boolean preHandle (HttpServletRequest req,HttpServletResponse resp,Object handler)throws Exception{ //TODO handler was called before execution return true;} publilc void postHandle (HttpServletRequest req,HttpServletResponse resp,Object handler,ModelAndView mv)throws Exception{ //TODO handler invoked after execution} public void afterCompletion (HttpServletRequest req,HttpServletResponse resp,Object handler,Exception e)throws Exception{ //TODO Called after all execution is complete}}

This custom interceptor implements HandlerInterceptor interface to implement all methods in the interface. If you only want to use a certain method, you can inherit HandlerInterceptorAdapter.

Interceptor configuration

At this point, I believe that everyone has a deeper understanding of "Spring interceptor implementation HandlerInterceptor interface code parsing", may wish to actually operate it! Here is the website, more related content can enter the relevant channels for inquiry, pay attention to us, continue to learn!

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