基于SpringAop中JoinPoint对象的使用说明

Object proceed() throws Throwable //执行目标方法
Object proceed(Object[] var1) throws Throwable //传入的新的参数去执行目标方法

@Aspect
@Component
public class aopAspect {
    
    @Pointcut("execution(* aopdemo.*.*(..))")
    public void declareJoinPointerExpression() {}
    
    @Before("declareJoinPointerExpression()")
    public void beforeMethod(JoinPoint joinPoint){
        System.out.println("目标方法名为:" + joinPoint.getSignature().getName());
        System.out.println("目标方法所属类的简单类名:" +        joinPoint.getSignature().getDeclaringType().getSimpleName());
        System.out.println("目标方法所属类的类名:" + joinPoint.getSignature().getDeclaringTypeName());
        System.out.println("目标方法声明类型:" + Modifier.toString(joinPoint.getSignature().getModifiers()));
        //获取传入目标方法的参数
        Object[] args = joinPoint.getArgs();
        for (int i = 0; i < args.length; i++) {
            System.out.println("第" + (i+1) + "个参数为:" + args[i]);
        }
        System.out.println("被代理的对象:" + joinPoint.getTarget());
        System.out.println("代理对象自己:" + joinPoint.getThis());
    }
    
    @Around("declareJoinPointerExpression()")
    public Object aroundMethod(ProceedingJoinPoint pjd){
        Object result = null;
        try {
            //前置通知
            System.out.println("目标方法执行前...");
            //执行目标方法
            //result = pjd.proeed();
            //用新的参数值执行目标方法
            result = pjd.proceed(new Object[]{"newSpring","newAop"});
            //返回通知
            System.out.println("目标方法返回结果后...");
        } catch (Throwable e) {
            //异常通知
            System.out.println("执行目标方法异常后...");
            throw new RuntimeException(e);
        }
        //后置通知
        System.out.println("目标方法执行后...");
        return result;
    }
}

@Component
public class TargetClass {
    
    public String joint(String str1, String str2) {
        return str1 + "+" + str2;
    }
}

public class TestAop {
    @Test
    public void testAOP() {
        //1、创建Spring的ioc的容器
        ApplicationContext ctx = new ClassPathXmlApplicationContext("classpath:bean.xml");
        //2、从IOC容器中获取bean的实例
        TargetClass targetClass = (TargetClass) ctx.getBean("targetClass");
        //3、使用bean
        String result = targetClass.joint("spring","aop");
        System.out.println("result:" + result);
    }
}

String className = joinPoint.getSignature().getDeclaringTypeName();

String methodName = joinPoint.getSignature().getName();

MethodSignature methodSignature = (MethodSignature)joinPoint.getSignature();
Class clazz = methodSignature.getReturnType();

joinPoint.proceed();

proceed(java.lang.Object[] args)