5.2.2注意点 环绕 Spring AOP面向切面编程

/**

• className:{AroundAspect}
  */
  @Component
  @Aspect
  public class AroundAspect {
  //不能共用
  @Around(value = "com.atguigu.pointcut.PointCut.pcForService()")
  public Object methodAround(ProceedingJoinPoint joinPoint){
  // 1.通过JoinPoint对象获取目标方法签名对象
  // 方法的签名：一个方法的全部声明信息
  Signature signature = joinPoint.getSignature();
  System.out.println("signature = " + signature);

   // 2.通过方法的签名对象获取目标方法的详细信息
   String methodName = signature.getName();//方法名
   System.out.println("methodName = " + methodName);
  
   int modifiers = signature.getModifiers();//权限信息
   System.out.println("modifiers = " + modifiers);
  
   String declaringTypeName = signature.getDeclaringTypeName();
   System.out.println("declaringTypeName = " + declaringTypeName);
   Class getDeclaringType = signature.getDeclaringType();
   System.out.println("getDeclaringType = " + getDeclaringType);
  
  
   // 3.通过JoinPoint对象获取外界调用目标方法时传入的实参列表
   Object[] args = joinPoint.getArgs();//参数
  
   // 4.由于数组直接打印看不到具体数据，所以转换为List集合
   List<Object> argList = Arrays.asList(args);
   System.out.println("argList = " + argList);
  
  
   //保证目标方法被执行即可
   Object result = null;
   try {
       //增强代码 -> before
       System.out.println("[AOP前置通知] " + methodName + "方法开始了，参数列表：" + argList);
       result = joinPoint.proceed(args);
       System.out.println("[AOP返回通知] "+methodName+"方法成功结束了，返回值是：" + result);
  
   } catch (Throwable e) {
       System.out.println("[AOP异常通知] "+methodName+"方法抛异常了，异常类型是：" + e.getClass().getName());
       throw new RuntimeException(e);
   }finally {
       System.out.println("[AOP最后通知] "+methodName);
   }
  
   return result;
  

  }

}