使用“org.springframework.web.context.support.WebApplicationContextUtils;”类

这个工具类可以通过HttpServletRequest请求对象的上下文（ServetCotext）获取Spring管理的Bean

private <T> T getMapper(Class<T> clazz,HttpServletRequest request)
      {
        BeanFactory factory = WebApplicationContextUtils.getRequiredWebApplicationContext(request.getServletContext());
        return factory.getBean(clazz);
      }

使用时

SystemLogRepository systemLogRepository = getMapper(SystemLogRepository.class,arg0);

获取了JPA接口实例，。save,findone,findAll等都可使用了。

举个栗子：

    private <T> T getMapper(Class<T> clazz, HttpServletRequest request) {
        BeanFactory factory = WebApplicationContextUtils.getRequiredWebApplicationContext(request.getServletContext());
        return factory.getBean(clazz);
    }


    private boolean isSessionIdInvild(String sessionId, HttpServletRequest request) {
        if (sessionServiceRepository == null)
            sessionServiceRepository = getMapper(YtTbFontSiteUserEntityRepository.class, request);
        if (sessionId != null && sessionId.length() > 0) {
            YtTbFontSiteUserEntity usedFontSiteUserEntity = sessionServiceRepository.findOneBySessionId(sessionId, 0);
            return usedFontSiteUserEntity != null && usedFontSiteUserEntity.getSessionInvildDateTime() != null && DateUtil.diffTimes(usedFontSiteUserEntity.getSessionInvildDateTime(), new Date(System.currentTimeMillis())) < 0;

        }
        return false;
    }