springboot-拦截器

第一步，创建拦截器组件

@Component
public class ErrorCodeInterceptor implements HandlerInterceptor{
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        int k=0;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

第二步，在入口类的目录或者兄弟目录下创建一个类继承WebMvcConfigurerAdapter类并重写addInterceptors方法

@SpringBootApplication
public class ErrorCodeConfig extends WebMvcConfigurerAdapter {
    @Autowired
    ErrorCodeInterceptor errorCodeInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {

        registry.addInterceptor(errorCodeInterceptor).addPathPatterns("/**");
        super.addInterceptors(registry);
    }
}