注解的用法

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1.用于切面编程

@Target({ElementType.PARAMETER, ElementType.METHOD})@Retention(RetentionPolicy.RUNTIME)@Documentedpublic  @interface SystemServiceLog {    String description()  default "";}

@Pointcut("@annotation(com.gidoor.zcwd.web.annotation.SystemServiceLog)")public  void serviceAspect() {}

@AfterThrowing(pointcut = "serviceAspect()", throwing = "e")public  void doAfterThrowing(JoinPoint joinPoint, Throwable e) {    HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();}

2.用于拦截

/** * 权限限制 * @author  2015-12-12 18:29:02 */@Target(ElementType.METHOD)@Retention(RetentionPolicy.RUNTIME)public @interface PermessionLimit {      /**    * 登录拦截 (默认拦截)    */   boolean limit() default true;}

/** * 权限拦截, 简易版 * @author  2015-12-12 18:09:04 */public class PermissionInterceptor extends HandlerInterceptorAdapter {         @Override   public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {            if (!(handler instanceof HandlerMethod)) {         return super.preHandle(request, response, handler);      }            if (!ifLogin(request)) {         HandlerMethod method = (HandlerMethod)handler;         PermessionLimit permission = method.getMethodAnnotation(PermessionLimit.class);         if (permission == null || permission.limit()) {            response.sendRedirect(request.getContextPath() + "/toLogin");            //request.getRequestDispatcher("/toLogin").forward(request, response);            return false;         }      }            return super.preHandle(request, response, handler);   }   }

@RequestMapping("/toLogin")@PermessionLimit(limit=false)public String toLogin(Model model, HttpServletRequest request) {   if (PermissionInterceptor.ifLogin(request)) {      return "redirect:/";   }   return "login";

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