拦截器

SpringBoot配置拦截器

1.实现一个拦截器

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实现HandlerInterceptor
重写preHandle方法，postHandler，afterCompletion方法
public class testInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        //这里就可以根据request判断token session等等。
        System.out.println("进入拦截器啦！");
        return false;
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                            @Nullable ModelAndView modelAndView) throws Exception {
        System.out.println("Bye!");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
        System.out.println("执行了TestInterceptor的afterCompletion方法");
    }
}

2.将拦截器配置到SpringBoot程序中，在Spring中，使用XML的方式，而在Boot中只需要定义一个带有@Configuration的配置类即可，需要实现WebMvcConfigure接口

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@Configuration
public class testMvcConfigure implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        InterceptorRegistration registration = registry.addInterceptor(new testInterceptor());
        registration.addPathPatterns("/**");                      //所有路径都被拦截
        registration.excludePathPatterns(                         //添加不拦截路径
                "/vip/wang"          
        );
    }

}