ProceedingJoinPoint详解

源码

package org.aspectj.lang;

import org.aspectj.runtime.internal.AroundClosure;

public interface ProceedingJoinPoint extends JoinPoint {
    void set$AroundClosure(AroundClosure var1);

    default void stack$AroundClosure(AroundClosure arc) {
        throw new UnsupportedOperationException();
    }

    Object proceed() throws Throwable;

    Object proceed(Object[] var1) throws Throwable;
}
//joinpoint实现：
 public Object proceed() throws Throwable {
        if (this.arcs == null) {
            return this.arc == null ? null : this.arc.run(this.arc.getState());
        } else {
            return ((AroundClosure)this.arcs.peek()).run(((AroundClosure)this.arcs.peek()).getState());
        }
    }

Proceedingjoinpoint 继承了JoinPoint，在JoinPoint的基础上暴露出 proceed()， 这个方法是AOP代理链执行的方法。ProceedingJoinPoint包含了被通知方法的执行信息，同时可以访问被通知方法的信息和参数。可以通过使用ProceedingJoinPoint接口来实现更加灵活和精细的环绕通知逻辑。

用法

获得切点对应的方法（Method）

@Around("pointCut()")
public void around3(ProceedingJoinPoint joinPoint) throws Throwable {
    MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
    Method method = methodSignature.getMethod();
}

获得参数（Object[]）

@Around("pointCut()")
public void around3(ProceedingJoinPoint joinPoint) throws Throwable {
    Object[] objects = joinPoint.getArgs();
    for (Object o : objects) {
        System.out.println(o);
        if (o instanceof User) {
            System.out.println("id是："     + ((User) o).getId() +
                                "; 名字是：" + ((User) o).getUserName() +
                                "; 备注是：" + ((User) o).getNote());
        }
    }
}

获得目标类

@Around("pointCut()")
public void around3(ProceedingJoinPoint joinPoint) throws Throwable {
    System.out.println("joinPoint.getTarget().toString() : " + 
        joinPoint.getTarget().toString());
}