springboot拦截器注入service为null的问题解决方式

柔光的暖阳◎ 2022-03-07 12:24 854阅读 0赞

## 拦截器代码： ##

@Component
    public class AccessInterceptor implements HandlerInterceptor {
        @Autowired
        private RedisService redisService;
    
    
        @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 {
            System.out.println("==========zcc====postHandle====");
        }
    
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
            System.out.println("==========zcc====afterCompletion====");
        }
    }

## 拦截器配置：(此处重要) ##

@Configuration
    public class MyAdapter implements WebMvcConfigurer {
        private Logger logger = LoggerFactory.getLogger(MyAdapter.class);
        @Bean
        public AccessInterceptor getAccessInterceptor(){
            System.out.println("注入了AccessInterceptor");
            return new AccessInterceptor();
        }
    
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            registry.addInterceptor(getAccessInterceptor()).addPathPatterns("/**");
            logger.info("============添加拦截器============");
    
        }
       
    }

注意： registry.addInterceptor(getAccessInterceptor()) 里面的参数一定要是@bean 的方法名getAccessInterceptor()，

我之前里面是 new AccessInterceptor() 导致一直无法加载Bean。