【MARK】拦截器中自动注入失败问题

我在拦截器中想自动注入一个对象的时候发现无法注入，获取到的一直是null

public class RestInterceptor implements HandlerInterceptor {
    
    @Autowired
    private EscUserMapper escUserMapper;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws BaseAppException {
        return true;
    }
    
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
        ModelAndView modelAndView) throws BaseAppException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
        throws BaseAppException {
        // TODO Auto-generated method stub
        
    }
}

　　

解决办法：
在Spring添加拦截器之前先自己创建一下这个Spring Bean，这样就能在Spring映射这个拦截器前自动注入对象了。

@Configuration
public class RestWebAppConfigurer extends WebMvcConfigurerAdapter {
    
    @Bean
    public RestInterceptor restInterceptor() {
        return new RestInterceptor();
    }

    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(restInterceptor()).addPathPatterns("/iot/**");
        super.addInterceptors(registry);
    }
}

　　

参考文档：http://www.cnblogs.com/niceboat/p/6958895.html