拦截器Interceptor的使用

一、声明一个拦截器实现HandlerInterceptor,并实现它的preHandle()方法

        @Component
        public class LoginInterceptor implements HandlerInterceptor {
            @Override
            public boolean preHandle(HttpServletRequest request, HttpServletResponse 				response, Object handler) throws Exception {
            //可以try{}catch()进行业务处理
            try{
                //业务逻辑
                return true; //正确返回,放行
            }catch(){
                //业务逻辑
                return false; //错误返回,拦截
            }
          }

二、写一个Config去注册这个拦截器

        @Configuration
        public class WebConfig implements WebMvcConfigurer {
            @Autowired
            private LoginInterceptor loginInterceptor;
            @Override
            public void addInterceptors(InterceptorRegistry registry) {
            //可设置哪些接口不拦截 excludePathPatterns();
            registry.addInterceptor(loginInterceptor).excludePathPatterns("/user/login","/user/register");
            }
        }