java攔截器（interceptor）

1.聲明式

（1）注解，使用Aspect的@Aspect

 

 （2）實現HandlerInterceptor

/**
 * 攔截請求
 * 
 * @author Administrator
 *
 */
@Component
public class RequestHandlerInterceptor implements HandlerInterceptor {
    @Resource
    private RedisUtil redisUtil;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        String address = request.getParameter("address");
        if (redisUtil.get(address) != null && StringUtils.isNotBlank(String.valueOf(address))) {
            response.setCharacterEncoding("gbk");
            ResultObject ro = ResultObject.fail().add("result", "水肥機器正在執行中，該命令不能同步執行");
            PrintWriter pw = response.getWriter();
            pw.write(JSONObject.toJSONString(ro));
            return false;
        } else {
            System.out.println("下發地址---------------" + address);
        }
        
        return HandlerInterceptor.super.preHandle(request, response, handler);
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {
        // TODO Auto-generated method stub
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

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

}

添加攔截器，實現WebMvcConfigurer

/**
 * @author Administrator
 *
 */
@Configuration
public class RequestConfigurerAdapter implements WebMvcConfigurer {
    @Autowired
    private RequestHandlerInterceptor requestHandlerInterceptor;
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // TODO Auto-generated method stub
        WebMvcConfigurer.super.addInterceptors(registry);
        registry.addInterceptor(this.requestHandlerInterceptor).addPathPatterns("/**");
    }

}

 

（3）配置

使用aop空間中的相關標簽