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                ### 后置通知@AfterReturning 通過@AfterReturning注解進行標注,該函數在目標函數執行完成后執行,并可以獲取到目標函數最終的返回值returnVal,當目標函數沒有返回值時,returnVal將返回null,必須通過returning = “returnVal”注明參數的名稱而且必須與通知函數的參數名稱相同。請注意,在任何通知中這些參數都是可選的,需要使用時直接填寫即可,不需要使用時,可以完成不用聲明出來 ``` /** * 后置通知,不需要參數時可以不提供 */ @AfterReturning(value="execution(* com.zejian.spring.springAop.dao.UserDao.*User(..))") public void AfterReturning(){ System.out.println("我是后置通知..."); } /** * 后置通知 * returnVal,切點方法執行后的返回值 */ @AfterReturning(value="execution(* com.zejian.spring.springAop.dao.UserDao.*User(..))",returning = "returnVal") public void AfterReturning(JoinPoint joinPoint,Object returnVal){ System.out.println("我是后置通知...returnVal+"+returnVal); } ```
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