自定义Aop注解

首先声明自己的注解。

  1. @Retention(RetentionPolicy.RUNTIME)@Target({ ElementType.METHOD })public @interface MyAop {}

其次编写拦截器

  1. public class SimpleInterceptor implements MethodInterceptor {
  2.     public static boolean called = false;
  3.     public Object invoke(MethodInvocation invocation) throws Throwable {
  4.         called = true;
  5.         try {
  6.             System.out.println("before... ");
  7.             Object returnData = invocation.proceed();
  8.             System.out.println("after...");
  9.             return returnData;
  10.         } catch (Exception e) {
  11.             System.out.println("throw...");
  12.             throw e;
  13.         }
  14.     }
  15. }

最后，配置拦截器的筛选器。筛选所有标记了 MyAop 注解的 Bean 都使用我们的拦截器，我们在 Module 中进行如下声明：

  1. public class MyAopSetup implements Module {
  2.     public void loadModule(ApiBinder apiBinder) throws Throwable {
  3.         //1.任意类
  4.         Matcher<Class<?>> atClass = AopMatchers.anyClass();
  5.         //2.有MyAop注解的方法
  6.         Matcher<Method> atMethod = AopMatchers.annotatedWithMethod(MyAop.class);
  7.         //3.让@MyAop注解生效
  8.         apiBinder.bindInterceptor(atClass, atMethod, new SimpleInterceptor());
  9.     }
  10. }