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                            ### 前置通知@Before

前置通知通過@Before注解進行標注，并可直接傳入切點表達式的值，該通知在目標函數執行前執行，注意JoinPoint，是Spring提供的靜態變量，通過joinPoint 參數，可以獲取目標對象的信息,如類名稱,方法參數,方法名稱等，該參數是可選的

```
/**
 * 前置通知
 * @param joinPoint 該參數可以獲取目標對象的信息,如類名稱,方法參數,方法名稱等
 */
@Before("execution(* com.zejian.spring.springAop.dao.UserDao.addUser(..))")
public void before(JoinPoint joinPoint){
    System.out.println("我是前置通知");
}
```




                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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