摘要
最近在项目中用拦截器去拦截用户操作，并对操作日志进行记录， 在拦截器中记录日志时调用service 层 的save方法，发现service为null ,通过 @Autowired private LogService logService;这种方式无法注入；解决办法看以下代码。
@Configuration 
public class OptPermissionHandlerInterceptor extends HandlerInterceptorAdapter { 
  private Logger logger = LoggerFactory.getLogger(OptPermissionHandlerInterceptor.class); 
 
  @Autowired 
  private OperatorLogService operatorLogService; //这里使用@Autowired无法注入成功 
 
  @Override 
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws      Exception { 
        if (true) { 
            return true; 
        } else { 
            String result = "当前登录用户无权限！"; 
            response.getOutputStream().write(result.getBytes()); 
            response.setStatus(HttpStatus.OK.value()); 
            return false; 
        } 
  } 
 
  @SuppressWarnings("rawtypes") 
  @Override 
  public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { 
    try { 
      if (handler instanceof HandlerMethod) { 
           HandlerMethod handlerMethod = (HandlerMethod) handler; 
           String beanName = handlerMethod.getBean().getClass().toString(); 
           String methodName = handlerMethod.getMethod().getName(); 
           String uri = request.getRequestURI(); 
           String remoteAddr = request.getRemoteAddr(); 
           String sessionId = request.getSession().getId(); 
 
           OperatorLog optLog = new OperatorLog(); 
           optLog.setBeanName(beanName); 
           optLog.setMethodName(methodName); 
           optLog.setRemoteAddr(remoteAddr); 
           optLog.setSessionId(sessionId); 
           optLog.setUri(uri); 
 
      if (operatorLogService == null) {//解决service为null无法注入问题 
         System.out.println("operatorLogService is null!!!"); 
         BeanFactory factory = WebApplicationContextUtils.getRequiredWebApplicationContext(request.getServletContext()); 
         operatorLogService = (OperatorLogService) factory.getBean("operatorLogService"); 
      } 
      operatorLogService.saveOperatorLog(optLog); 
     } 
   } catch (Exception e) { 
       logger.error("", e); 
   } 
  } 
  
  @Override 
  public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, 
      Exception ex) throws Exception {
 
  } 
 

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原文：https://blog.csdn.net/yubinpll9110/article/details/51820336