Intercept

The WebMVC module is based on the new features of YMPv2.0. It natively supports AOP method interception and is configured through the following annotations:

@Before: used to set the prefix of a class or method Interceptor, the pre-interceptor declared on the class will be applied to all methods of the class;

@After: used to set the post-interceptor of a class or party, the post-interceptor declared on the class Set interceptors will be applied to all methods of the class;

@Clean: used to clean all or specified interceptors on the class, the cleaned interceptors will not be executed;

@ContextParam: used to set context parameters, mainly used to pass parameter configurations to interceptors;

@Ignored: declaring a method will ignore all interceptor configurations;

Description: Declaring @Ignored annotated methods, non-public methods, Object class methods and Object class overloaded methods will not be processed by the interceptor.

Sample code:

    // 创建自定义拦截器
    public class UserSessionChecker implements IInterceptor {
        public Object intercept(InterceptContext context) throws Exception {
            // 判断当前拦截器执行方向
            if (context.getDirection().equals(Direction.BEFORE)
                    && WebContext.getRequest().getSession(false) == null) {
                return View.redirectView("/user/login");
            }
            return null;
        }
    }

    @Controller
    @RequestMapping("/user")
    @Before(UserSessionChecker.class)
    public class Controller {

        @RequestMapping("/center")
        public IView userCenter() throws Exception {
            // ......
            return View.jspView("/user/center");
        }

        @RequestMapping("/login")
        @Clean
        public IView userLogin() throws Exception {
            return View.jspView("/user/login");
        }
    }