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This article mainly shows you the "sample analysis of multiple interceptor configuration and use scenarios in SpringBoot2", which is easy to understand and well-organized. I hope it can help you solve your doubts. Let me lead you to study and learn "sample analysis of multiple interceptor configuration and use scenarios in SpringBoot2".

Brief introduction of interceptor 1. Definition of interceptor

Interceptor, before the requested interface is accessed, intercept and then add some operation before or after. Interception is an implementation strategy of AOP. Interceptors are mainly used to reject requests in accordance with specified rules.

2. Apply token token verification request data verification user rights verification and release specified interface 2, SpringBoot2.0 interceptor usage 1, write two interceptors

Custom classes implement the HandlerInterceptor interface

1) OneInterceptor interceptor

Import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * interceptor 1 * / public class OneInterceptor implements HandlerInterceptor {private static final Logger LOGGER = LoggerFactory.getLogger (OneInterceptor.class.getName ()); @ Override public boolean preHandle (HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {String url = String.valueOf (request.getRequestURL ()) LOGGER.info ("1, url==" + url); / / Let go of intercepting return true;} @ Override public void postHandle (HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {LOGGER.info ("1, postHandle");} @ Override public void afterCompletion (HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {LOGGER.info ("1, afterCompletion");}}

2) TwoInterceptor interceptor

Import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * interceptor 2 * / public class TwoInterceptor implements HandlerInterceptor {private static final Logger LOGGER = LoggerFactory.getLogger (TwoInterceptor.class.getName ()); @ Override public boolean preHandle (HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {String url = String.valueOf (request.getRequestURL ()) LOGGER.info ("2, url==" + url); / / unblock return true;} @ Override public void postHandle (HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {LOGGER.info ("2, postHandle");} @ Override public void afterCompletion (HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {LOGGER.info ("2, afterCompletion");}} 2. Injection interceptor import com.boot.intercept.intercept.OneInterceptor;import com.boot.intercept.intercept.TwoInterceptor into Web configuration file Import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.InterceptorRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;/** * Web configuration file * / @ Configurationpublic class WebMvcConfig implements WebMvcConfigurer {public void addInterceptors (InterceptorRegistry registry) {/ / intercept all paths / / register custom two interceptors registry.addInterceptor (new OneInterceptor ()) .addPathPatterns ("/ * *"); registry.addInterceptor (new TwoInterceptor ()) .addPathPatterns ("/ * *") 3. Write the test interface import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class InterceptController {@ RequestMapping ("/ reqUrl") public String reqUrl () {return "success";} 4, access the test interface

The log output is as follows

Intercept.OneInterceptor: 1 、 url== http://127.0.0.1:8005/reqUrlintercept.TwoInterceptor: 2 、 url== http://127.0.0.1:8005/reqUrlintercept.TwoInterceptor: 2 、 postHandleintercept.OneInterceptor: 1 、 postHandleintercept.TwoInterceptor: 2 、 afterCompletionintercept.OneInterceptor: 1 、 afterCompletionla

The interception order of interceptors is performed in the order in which interceptors are injected into the Web configuration file.

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