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                ### 環繞通知@Around 環繞通知既可以在目標方法前執行也可在目標方法之后執行,更重要的是環繞通知可以控制目標方法是否指向執行,但即使如此,我們應該盡量以最簡單的方式滿足需求,在僅需在目標方法前執行時,應該采用前置通知而非環繞通知。案例代碼如下第一個參數必須是ProceedingJoinPoint,通過該對象的proceed\(\)方法來執行目標函數,proceed\(\)的返回值就是環繞通知的返回值。同樣的,ProceedingJoinPoint對象也是可以獲取目標對象的信息,如類名稱,方法參數,方法名稱等等 ``` @Around("execution(* com.zejian.spring.springAop.dao.UserDao.*User(..))") public Object around(ProceedingJoinPoint joinPoint) throws Throwable { System.out.println("我是環繞通知前...."); //執行目標函數 Object obj= (Object) joinPoint.proceed(); System.out.println("我是環繞通知后...."); return obj; } ```
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