spring 18 动态通知调用 - qidao123.com技术社区-IT企服评测·应用市场

@Aspect
static class MyAspect {
@Before("execution(* foo(..))") // 静态通知调用，不带参数绑定，执行时不需要切点
public void before1() {
System.out.println("before1");
}
@Before("execution(* foo(..)) && args(x)") // 动态通知调用，需要参数绑定，执行时还需要切点对象
public void before2(int x) {
System.out.printf("before2(%d)%n", x);
}
}
static class Target {
public void foo(int x) {
System.out.printf("target foo(%d)%n", x);
}
}
@Configuration
static class MyConfig {
@Bean
AnnotationAwareAspectJAutoProxyCreator proxyCreator() {
return new AnnotationAwareAspectJAutoProxyCreator();
}
@Bean
public MyAspect myAspect() {
return new MyAspect();
}
}
public static void main(String[] args) throws Throwable {
GenericApplicationContext context = new GenericApplicationContext();
context.registerBean(ConfigurationClassPostProcessor.class);
context.registerBean(MyConfig.class);
context.refresh();
AnnotationAwareAspectJAutoProxyCreator creator = context.getBean(AnnotationAwareAspectJAutoProxyCreator.class);
List<Advisor> list = creator.findEligibleAdvisors(Target.class, "target");
Target target = new Target();
ProxyFactory factory = new ProxyFactory();
factory.setTarget(target);
factory.addAdvisors(list);
Object proxy = factory.getProxy(); // 获取代理
List<Object> interceptorList =
factory.getInterceptorsAndDynamicInterceptionAdvice(Target.class.getMethod(
"foo", int.class), Target.class);
for (Object o : interceptorList) {
showDetail(o);
}
System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>");
ReflectiveMethodInvocation invocation = new ReflectiveMethodInvocation(
proxy, target, Target.class.getMethod("foo", int.class),
new Object[]{100}, Target.class, interceptorList
) {}; // spring 内部可以创建匿名子类来创建构造器 protected 的对象
invocation.proceed();
/*
学到了什么
a. 有参数绑定的通知调用时还需要切点，对参数进行匹配及绑定
b. 复杂程度高, 性能比无参数绑定的通知调用低
*/
}
public static void showDetail(Object o) {
try {
Class<?> clazz = Class.forName("org.springframework.aop.framework.InterceptorAndDynamicMethodMatcher");
if (clazz.isInstance(o)) {
Field methodMatcher = clazz.getDeclaredField("methodMatcher");
methodMatcher.setAccessible(true);
Field methodInterceptor = clazz.getDeclaredField("interceptor");
methodInterceptor.setAccessible(true);
System.out.println("环绕通知和切点：" + o);
System.out.println("\t切点为：" + methodMatcher.get(o));
System.out.println("\t通知为：" + methodInterceptor.get(o));
} else {
System.out.println("普通环绕通知：" + o);
}
} catch (Exception e) {
e.printStackTrace();
}
}

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class S18Bean1 {
public S18Bean1() {
}
public void add() {
}
}

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public class S18Bean2 {
public static void main(String[] args) {
S18Bean1 s18Bean3 = new S18Bean1() {
};
S18Bean1 s18Bean2 = new S18Bean1() {
};
System.out.println(s18Bean3.getClass().getName());
System.out.println(s18Bean2.getClass().getName());
}
}

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