springMvc自定义拦截器HandlerInterceptorAdapter的认识

ssm框架在当今项目中是比较常用的，而我们也经常需要用到拦截器做资源和权限管理，譬如登陆拦截等等，最近几天领导要求我用拦截器做一个操作日志的记录，下面我给大家分享一下我的代码以及心得。

   SpringMVC的拦截器HandlerInterceptorAdapter对应提供了三个preHandle，postHandle，afterCompletion方法。preHandle在业务处理器处理请求之前被调用，
    postHandle在业务处理器处理请求执行完成后,生成视图之前执行，afterCompletion在DispatcherServlet完全处理完请求后被调用,可用于清理资源等 。所以要想实现自己的权限管理逻辑，需要继承HandlerInterceptorAdapter并重写其三个方法。
（1）   首先我们要注册拦截器并书写拦截

@Bean
public GlobalInterceptor globalInterceptor(){
   return new GlobalInterceptor();
}
@Bean
public InsuranceLoginterceptor insuranceLoginterceptor(){
   return  new InsuranceLoginterceptor();
}
@Override
public void addInterceptors(InterceptorRegistry registry) {
   registry.addInterceptor(globalInterceptor()).addPathPatterns("/**").excludePathPatterns("/api/**").excludePathPatterns("/staitc/**");
  registry.addInterceptor(insuranceLoginterceptor()).addPathPatterns("/api/yingu/insurance/updateInsuranceEmpNum");
   super.addInterceptors(registry);
}

（2）实现HandlerInterceptorAdapter自定义拦截器，并重写方法

@Override
public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
    log.info("进入调单方法controller层之前");
    String insuranceId = httpServletRequest.getParameter("insuranceId");
    try {
        FanHuaBack fanHuaBackOld = insureListService.getinsure(insuranceId);
        String oldData = JSON.toJSONString(fanHuaBackOld);
        httpServletRequest.setAttribute("dataBefore", oldData);
        super.preHandle(httpServletRequest,httpServletResponse,o);
    } catch (Exception e) {
        log.error("车险投保信息查询异常", e.getMessage());
    } finally {
        return true;
    }

}

@Override
public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
    log.info("进入调单方法controller层之后-----------日志记录开始");
    InsuranceOperatLog insuranceOperatLog = new InsuranceOperatLog();
    int status = 0;
    try {
        String requestURI = httpServletRequest.getRequestURI();
        String insuranceId = httpServletRequest.getParameter("insuranceId");
        String empNo = httpServletRequest.getParameter("empNo");
        String empName = httpServletRequest.getParameter("empName");
        int  opeStatus = (int) httpServletRequest.getAttribute("status");
        FanHuaBack fanHuaBackNew = insureListService.getinsure(insuranceId);
        String newData = JSON.toJSONString(fanHuaBackNew);
        String oldData = (String) httpServletRequest.getAttribute("dataBefore");
        Map<String, String> map = new HashMap<>();
        map.put("empNum", empNo);
        map.put("empName", empName);
        map.put("insuranceId", insuranceId);
        String reqObj = JSON.toJSONString(map);
        insuranceOperatLog.setInsuranceId(insuranceId);
        insuranceOperatLog.setCreateTime(DateUtil.format(new Date(), DateUtil.Formatter.yyyyMMddHHmmss));
        insuranceOperatLog.setDataBefore(oldData);
        insuranceOperatLog.setDataAfter(newData);
        insuranceOperatLog.setReq_json(reqObj);
        insuranceOperatLog.setReq_url(requestURI);
        insuranceOperatLog.setOperatorType("调单");
        insuranceOperatLog.setStatus(opeStatus == 1 ? "成功" : "失败");
        SysUser sysUser = (SysUser) SecurityUtils.getSubject().getPrincipal();
        if (sysUser != null) {
            insuranceOperatLog.setOperatorName(sysUser.getLoginName());
            insuranceOperatLog.setOperatorNo(sysUser.getUserNo());
        }
        insuranceOperatRepository.save(insuranceOperatLog);
        super.postHandle(httpServletRequest,httpServletResponse,o,modelAndView);
    } catch (Exception ex) {
        log.error("调单操作异常日志保存异常{}", ex.getMessage());
    }
    log.info("调单操作日志记录结束{}");
}

@Override
public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

}

（3） preHandle（）方法 在业务处理器处理请求之前被调用   如果返回false    从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链   如果返回true     执行下一个拦截器,直到所有的拦截器都执行完毕     再执行被拦截的Controller     然后进入拦截器链,    从最后一个拦截器往回执行所有的postHandle()   接着再从最后一个拦截器往回执行所有的afterCompletion()   ；postHandle（） 在业务处理器处理请求执行完成后,生成视图之前执行的动作  可在modelAndView中加入数据，比如当前时间  ；afterCompletion（）方法 在DispatcherServlet完全处理完请求后被调用,可用于清理资源等 ， 当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion()   。

希望可以对大家有所帮助！