【Spring AOP】@Aspect结合案例详解（一）: @Pointcut使用@annotation + 五种通知

package com.tiangang.aop; import org.aspectj.lang.JoinPoint; import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.After; import org.aspectj.lang.annotation.AfterReturning; import org.aspectj.lang.annotation.AfterThrowing; import org.aspectj.lang.annotation.Around; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; import org.aspectj.lang.reflect.MethodSignature; import org.springframework.stereotype.Component; import org.aspectj.lang.annotation.Aspect; import java.lang.reflect.Method; import java.util.Arrays; /** * 作者：天罡gg * 博文地址：https://blog.csdn.net/scm_2008/article/details/128593857 * 有任何问题，欢迎大家私信联系我. */ @Component @Aspect public class MethodLogAspect { @Pointcut(value = "@annotation(com.tiangang.aop.MethodLog)") public void pointCut() { } @Before("pointCut()") public void before(JoinPoint joinPoint) throws NoSuchMethodException { printMethod(joinPoint, "[前置通知before]"); } @After("pointCut()") public void after(JoinPoint joinPoint) throws NoSuchMethodException { printMethod(joinPoint, "[后置通知after]"); } // 注意要加returning参数，否则会报：0 formal unbound in pointcut @AfterReturning(value = "pointCut()", returning = "result") public void afterReturning(JoinPoint joinPoint, Object result) throws NoSuchMethodException { printMethod(joinPoint, "[返回通知afterReturning]"); System.out.printf("[MethodLogAspect]切面 [返回通知afterReturning] 打印结果 -> result:%s%n", result); } // 注意要加throwing参数，否则会报：0 formal unbound in pointcut @AfterThrowing(value = "pointCut()", throwing = "e") public void afterThrowing(JoinPoint joinPoint, Exception e) throws NoSuchMethodException { printMethod(joinPoint, "[异常通知afterThrowing]"); System.out.printf("[MethodLogAspect]切面 [异常通知afterThrowing] 打印异常 -> Exception:%s%n", e); } // 注意参数类型是 ProceedingJoinPoint @Around("pointCut()") public Object around(ProceedingJoinPoint joinPoint) throws Throwable { printMethod(joinPoint, "[环绕通知around][proceed之前]"); // 执行方法 Object result = joinPoint.proceed(); System.out.printf("[MethodLogAspect]切面 [环绕通知around][proceed之后]打印 -> [result]:%s%n", result); return result; } private void printMethod(JoinPoint joinPoint, String name) throws NoSuchMethodException { MethodSignature signature = (MethodSignature) joinPoint.getSignature(); Class<?> clazz = joinPoint.getTarget().getClass(); Method method = clazz.getMethod(signature.getName(), signature.getParameterTypes()); System.out.printf("[MethodLogAspect]切面 %s 打印 -> [className]:%s -> [methodName]:%s -> [methodArgs]:%s%n" , name, clazz.getName(), method.getName(), Arrays.toString(joinPoint.getArgs())); } }