Fast write a Spring AOP implementation class
1. Define traffic class, using annotations added @Service Spring container.
@Service
public class the MyService {
public String Print () {
System.out.println ( "Print ...");
return "End";
}
}
1. Define aspect class using annotations added @Component Spring container, such as a cut label @Aspect represents the class, and to a method for labeling the type of notification.
Notification type
- Before advice
- After returning advice
- Back to News
- Abnormal notice
- Around advice
@Aspect
@Component
public class MyAspect {
@Pointcut("execution(* com.xxx.MyService.*(..))")
public void pointCut() {
}
@Before("pointCut()")
public void start() {
System.out.println("前置通知");
}
@After("pointCut()")
public void end() {
System.out.println("后置通知");
}
@AfterReturning("pointCut()")
public void returnStart() {
System.out.println("返回通知");
}
@AfterThrowing("pointCut()")
public void exceptionStart() {
System.out.println("异常通知");
}
@Around("pointCut()")
public Object startAround(ProceedingJoinPoint joinPoint) throws Throwable {
System.out.println("环绕通知开始");
Object proceed = joinPoint.proceed(joinPoint.getArgs());
System.out.println("环绕通知结束" + proceed);
return proceed;
}
}
1.定义启动类
@EnableAspectJAutoProxy
@ComponentScan
public class App {
public static void main(String[] args) {
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(App.class);
MyService service = context.getBean(MyService.class);
System.out.println("启动");
String print = service.print();
System.out.println(print);
}
}
Export
Start
around advice to start
pre-notification
print ...
around the end of the notice End
post notice
returned to inform
End