自定义注解拦截(比如自定义注解,登陆拦截)

1.注解类

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Mytest {

    String value();
}

2.拦截类

@Configuration
public class Login extends WebMvcConfigurerAdapter {

    @Bean
    public SessionInterceptor getSessionInterceptor() {
        System.out.println("bean加载了!");
        return new SessionInterceptor();
    }
    
    
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        InterceptorRegistration addInterceptor = registry.addInterceptor(getSessionInterceptor());
        addInterceptor.addPathPatterns("/**");
    }


    private class SessionInterceptor extends HandlerInterceptorAdapter {

        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { 
            System.out.println("==================>");
            if(!(handler instanceof HandlerMethod)) {
                System.out.println(0);
                return true;
            }
            HandlerMethod handlerMethod = (HandlerMethod)handler;            
            Mytest methodAnnotation = handlerMethod.getMethodAnnotation(Mytest.class);            
            if(methodAnnotation == null){
                System.out.println(1);
                return true; 
            }
            String str = methodAnnotation.value(); 
            System.out.println("拦截value:"+str);
            System.out.println(2);
            return true;
        }

        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
            System.out.println("<=======*=======*========*======华丽的请求分割线======*=========*========*=======>");
        }
    }
    
}

3.使用类

@RestController
public class MyController {

    @Mytest(value = "true")
    @RequestMapping(value = "/test1/{id}", method = RequestMethod.GET)
    public  String getById(@PathVariable("id") Long id) {
         System.out.println("请求成功");
        return "1";
    }
    
    @RequestMapping(value = "/test2/{id2}", method = RequestMethod.GET)
    public  String getById2(@PathVariable("id2") Long id2) {
        System.out.println("请求成功");
        return "2";
    }
    
}

通过使用@Mytest注解,完成登陆拦截校验.