Spring-AOP通知获取数据

推荐先阅读：Spring全家桶

获取切入点方法的参数：所有通知

• JoinPoint：适用于@Before、@After、@AfterReturning、@AfterThrowing

  // JoinPoint对象描述了连接点方法的运行状态，可以获取到原始方法的调用参数
  @Before("pt()")
  public void before(JoinPoint jp){
      Object[] args = jp.getArgs();
      System.out.println(Arrays.toString(args));
  }

• ProceedingJoinPoint：适用于@Around

  // ProceedJointPoint是JoinPoint的子类
  @Around("pt()")
  public Object around(ProceedingJoinPoint pjp)throws Throwable {
      Object[] args = pjp.getArgs();
      System.out.println(Arrays.toString(args));
      Object ret = pjp.proceed();
      return ret;
  }

获取切入点方法返回值：@Before和@AfterThrowing是没有返回值，@After可有可无，所以不做研究

• @AfterReturning

  @AfterReturning(value = "pt()",returning = "ret")
  public void afterReturning(Object ret) {
      System.out.println("afterReturning advice ..."+ret);
  }

• @Around

  @Around("pt()")
  public Object around(ProceedingJoinPoint pjp) throws Throwable{
  	Object ret = pjp.proceed();
  	return ret;
  }

获取切入点方法运行异常信息：@Before和@AfterReturning是不会有，@After可有可无，所以不做研究

• @AfterThrowing

  @AfterThrowing(value = "pt()",throwing = "t")
  public void afterThrowing(Throwable t){
      System.out.println("afterThrowing advice ..." + t);
  }

• @Around

  @Around("pt()")
  public Object around(ProceedingJointPoint pjp){
      Object ret = null;
      try {
          ret = pjp.proceed();
      } catch (Throwable t) {
          t.printStackTrace();
      }
      return ret;
  }