连接点

• 在Spring中用JoinPoint抽象了连接点，用它可以获取方法执行时的相关信息，如目标类名、方法名、方法参数等
  • 对于@Around通知，获取连接点信息只能使用 ProceedingJoinPoint
  • 对于其它四种通知，获取连接点信息只能使用JoinPoint，它时是ProceedingJoinPoint的父亲类型
  • 具体代码如下

    • package com.example.tlias.AOP;import lombok.extern.slf4j.Slf4j;
      import org.aspectj.lang.JoinPoint;
      import org.aspectj.lang.ProceedingJoinPoint;
      import org.aspectj.lang.annotation.Around;
      import org.aspectj.lang.annotation.Aspect;
      import org.aspectj.lang.annotation.Before;
      import org.aspectj.lang.annotation.Pointcut;
      import org.springframework.stereotype.Component;import java.util.Arrays;@Component
      @Aspect
      @Slf4j
      public class TestJoinPoint {@Pointcut("execution(* com.example.tlias.service.DeptLogService.*(..))")public void PointCut() {}@Before("PointCut()")public void before(JoinPoint joinPoint) {log.info("TestJointPoint...before...");// 1.获取目标对象类名String ClassName = joinPoint.getTarget().getClass().getName();log.info("目标对象类名{}", ClassName);// 2.获取目标对象方法名String Methodname = joinPoint.getSignature().getName();log.info("目标对象的方法名{}", Methodname);// 3.获取目标方法运行时传入的参数Object[] args = joinPoint.getArgs();log.info("目标方法时传入的参数{}", Arrays.toString(args));}@Around("PointCut()")public Object around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {log.info("TestJointPoint...around...");// 1.获取目标对象类名String ClassName = proceedingJoinPoint.getTarget().getClass().getName();log.info("目标对象的类名是{}", ClassName);// 2.获取目标对象方法名String MethodName = proceedingJoinPoint.getSignature().getName();log.info("目标对象的方法名{}", MethodName);// 3.获取目标方法运行时传入的参数Object[] args = proceedingJoinPoint.getArgs();log.info("目标方法运行时传入的参数{}", Arrays.toString(args));// 4.放行目标方法执行Object result = proceedingJoinPoint.proceed();// 5.获取目标方法的返回值log.info("目标方法运行的返回值{}", result);log.info("TestJointPoint around after....");return result;}
      }