springboot实现拦截器

内容：继承HandlerInterceptorAdapter并实现WebMvcConfigurer，拦截器中的方法将preHandle->Controller->postHandle->affterCompletion的顺序执行。

注意：只有preHandle方法返回true时后面的方法才会执行。当拦截器链存在多个拦截器时，postHandle在所有拦截器内的所有拦截器返回成功时才会调用，而affterCompletion只有preHandle返回true才调用，但如果拦截器内的第一个拦截器的preHandle方法返回false,后面的方法都不会执行。

@Componentpublic class AppInterceptor extends HandlerInterceptorAdapter implements WebMvcConfigurer{@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {System.out.println("preHandle执行");return true;}@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {System.out.println("postHandle执行");}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {System.out.println("afterCompletion执行");}

//设置拦截路径配置，addPathPatterns为拦截的路径，excludePathPatterns为排除的路径

@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new TestInterceptor())
.addPathPatterns(“/**”)
.excludePathPatterns(“/hello1”);

}

}